feat(schema): Migrate temporal slots and introduce new pattern classes

Major slot migrations following slot_fixes.yaml revisions:
- TimeSpan: begin_of_the_begin, begin_of_the_end, end_of_the_begin, end_of_the_end
- Quantity: has_or_had_measurement_unit with MeasureUnit class
- Description: has_or_had_description with Description class
- URL, WikiData, Timestamp, Location, Provenance pattern classes

New slots for RiC-O compliance:
- Temporal: has_or_had_time_interval, calendar_system
- Transfer: is_or_was_transferred, has_or_had_policy
- Location: starts/ends_or_started/ended_at_location
- Provenance: has_or_had_provenance_path, is_or_was_webarchived_at

Archive deprecated slots per Rule 53 workflow.

frontend/public/schemas/20251121/linkml/manifest.json

@@ -1,12 +1,12 @@
 {
-  "generated": "2026-01-14T16:04:58.914Z",
+  "generated": "2026-01-14T18:57:52.851Z",
   "schemaRoot": "/schemas/20251121/linkml",
-  "totalFiles": 2888,
+  "totalFiles": 2957,
   "categoryCounts": {
     "main": 4,
-    "class": 689,
+    "class": 718,
-    "enum": 149,
+    "enum": 151,
-    "slot": 2042,
+    "slot": 2080,
     "module": 4
   },
   "categories": [
@@ -125,6 +125,16 @@
           "path": "modules/classes/AllocationAgency.yaml",
           "category": "class"
         },
+        {
+          "name": "Alpha2Code",
+          "path": "modules/classes/Alpha2Code.yaml",
+          "category": "class"
+        },
+        {
+          "name": "Alpha3Code",
+          "path": "modules/classes/Alpha3Code.yaml",
+          "category": "class"
+        },
         {
           "name": "AlternativeName",
           "path": "modules/classes/AlternativeName.yaml",
@@ -260,6 +270,11 @@
           "path": "modules/classes/ArchivesRegionalesRecordSetTypes.yaml",
           "category": "class"
         },
+        {
+          "name": "Area",
+          "path": "modules/classes/Area.yaml",
+          "category": "class"
+        },
         {
           "name": "ArtArchive",
           "path": "modules/classes/ArtArchive.yaml",
@@ -730,6 +745,21 @@
           "path": "modules/classes/ContributingAgency.yaml",
           "category": "class"
         },
+        {
+          "name": "ConversionRate",
+          "path": "modules/classes/ConversionRate.yaml",
+          "category": "class"
+        },
+        {
+          "name": "ConversionRateType",
+          "path": "modules/classes/ConversionRateType.yaml",
+          "category": "class"
+        },
+        {
+          "name": "ConversionRateTypes",
+          "path": "modules/classes/ConversionRateTypes.yaml",
+          "category": "class"
+        },
         {
           "name": "CoordinateProvenance",
           "path": "modules/classes/CoordinateProvenance.yaml",
@@ -765,6 +795,11 @@
           "path": "modules/classes/CurationActivity.yaml",
           "category": "class"
         },
+        {
+          "name": "Currency",
+          "path": "modules/classes/Currency.yaml",
+          "category": "class"
+        },
         {
           "name": "CurrentArchive",
           "path": "modules/classes/CurrentArchive.yaml",
@@ -935,6 +970,11 @@
           "path": "modules/classes/DepositArchiveRecordSetTypes.yaml",
           "category": "class"
         },
+        {
+          "name": "Description",
+          "path": "modules/classes/Description.yaml",
+          "category": "class"
+        },
         {
           "name": "DetectedEntity",
           "path": "modules/classes/DetectedEntity.yaml",
@@ -1160,6 +1200,11 @@
           "path": "modules/classes/Expenses.yaml",
           "category": "class"
         },
+        {
+          "name": "ExternalWork",
+          "path": "modules/classes/ExternalWork.yaml",
+          "category": "class"
+        },
         {
           "name": "ExtractionMetadata",
           "path": "modules/classes/ExtractionMetadata.yaml",
@@ -1450,6 +1495,11 @@
           "path": "modules/classes/HouseArchiveRecordSetTypes.yaml",
           "category": "class"
         },
+        {
+          "name": "Hypothesis",
+          "path": "modules/classes/Hypothesis.yaml",
+          "category": "class"
+        },
         {
           "name": "IconographicArchives",
           "path": "modules/classes/IconographicArchives.yaml",
@@ -1720,6 +1770,11 @@
           "path": "modules/classes/LocalHistoryArchiveRecordSetTypes.yaml",
           "category": "class"
         },
+        {
+          "name": "Location",
+          "path": "modules/classes/Location.yaml",
+          "category": "class"
+        },
         {
           "name": "LocationLibrary",
           "path": "modules/classes/LocationLibrary.yaml",
@@ -1760,6 +1815,11 @@
           "path": "modules/classes/MatchingSource.yaml",
           "category": "class"
         },
+        {
+          "name": "MeasureUnit",
+          "path": "modules/classes/MeasureUnit.yaml",
+          "category": "class"
+        },
         {
           "name": "MediaAppearanceEntry",
           "path": "modules/classes/MediaAppearanceEntry.yaml",
@@ -1795,6 +1855,11 @@
           "path": "modules/classes/MergeNote.yaml",
           "category": "class"
         },
+        {
+          "name": "Methodology",
+          "path": "modules/classes/Methodology.yaml",
+          "category": "class"
+        },
         {
           "name": "METSAPI",
           "path": "modules/classes/METSAPI.yaml",
@@ -2200,6 +2265,11 @@
           "path": "modules/classes/PatternClassification.yaml",
           "category": "class"
         },
+        {
+          "name": "PaymentMethod",
+          "path": "modules/classes/PaymentMethod.yaml",
+          "category": "class"
+        },
         {
           "name": "PerformingArtsArchive",
           "path": "modules/classes/PerformingArtsArchive.yaml",
@@ -2295,6 +2365,11 @@
           "path": "modules/classes/PhotoMetadata.yaml",
           "category": "class"
         },
+        {
+          "name": "Place",
+          "path": "modules/classes/Place.yaml",
+          "category": "class"
+        },
         {
           "name": "PlaceFeature",
           "path": "modules/classes/PlaceFeature.yaml",
@@ -2370,6 +2445,11 @@
           "path": "modules/classes/Project.yaml",
           "category": "class"
         },
+        {
+          "name": "Provenance",
+          "path": "modules/classes/Provenance.yaml",
+          "category": "class"
+        },
         {
           "name": "ProvenanceBlock",
           "path": "modules/classes/ProvenanceBlock.yaml",
@@ -2695,6 +2775,21 @@
           "path": "modules/classes/ScientificArchiveRecordSetTypes.yaml",
           "category": "class"
         },
+        {
+          "name": "Scope",
+          "path": "modules/classes/Scope.yaml",
+          "category": "class"
+        },
+        {
+          "name": "ScopeType",
+          "path": "modules/classes/ScopeType.yaml",
+          "category": "class"
+        },
+        {
+          "name": "ScopeTypes",
+          "path": "modules/classes/ScopeTypes.yaml",
+          "category": "class"
+        },
         {
           "name": "SearchAPI",
           "path": "modules/classes/SearchAPI.yaml",
@@ -3060,6 +3155,11 @@
           "path": "modules/classes/TimeEntryType.yaml",
           "category": "class"
         },
+        {
+          "name": "TimeInterval",
+          "path": "modules/classes/TimeInterval.yaml",
+          "category": "class"
+        },
         {
           "name": "TimeSlot",
           "path": "modules/classes/TimeSlot.yaml",
@@ -3075,6 +3175,11 @@
           "path": "modules/classes/TimespanBlock.yaml",
           "category": "class"
         },
+        {
+          "name": "Timestamp",
+          "path": "modules/classes/Timestamp.yaml",
+          "category": "class"
+        },
         {
           "name": "TradeRegister",
           "path": "modules/classes/TradeRegister.yaml",
@@ -3095,6 +3200,16 @@
           "path": "modules/classes/TradeUnionArchiveRecordSetTypes.yaml",
           "category": "class"
         },
+        {
+          "name": "TransferEvent",
+          "path": "modules/classes/TransferEvent.yaml",
+          "category": "class"
+        },
+        {
+          "name": "TransferPolicy",
+          "path": "modules/classes/TransferPolicy.yaml",
+          "category": "class"
+        },
         {
           "name": "TransitionType",
           "path": "modules/classes/TransitionType.yaml",
@@ -3145,6 +3260,16 @@
           "path": "modules/classes/UnspecifiedType.yaml",
           "category": "class"
         },
+        {
+          "name": "UpdateFrequency",
+          "path": "modules/classes/UpdateFrequency.yaml",
+          "category": "class"
+        },
+        {
+          "name": "URL",
+          "path": "modules/classes/URL.yaml",
+          "category": "class"
+        },
         {
           "name": "ValidationMetadata",
           "path": "modules/classes/ValidationMetadata.yaml",
@@ -3230,6 +3355,11 @@
           "path": "modules/classes/VideoTranscript.yaml",
           "category": "class"
         },
+        {
+          "name": "VisitingScholar",
+          "path": "modules/classes/VisitingScholar.yaml",
+          "category": "class"
+        },
         {
           "name": "Warehouse",
           "path": "modules/classes/Warehouse.yaml",
@@ -3365,6 +3495,16 @@
           "path": "modules/classes/WikidataEntity.yaml",
           "category": "class"
         },
+        {
+          "name": "WikiDataEntry",
+          "path": "modules/classes/WikiDataEntry.yaml",
+          "category": "class"
+        },
+        {
+          "name": "WikiDataIdentifier",
+          "path": "modules/classes/WikiDataIdentifier.yaml",
+          "category": "class"
+        },
         {
           "name": "WikidataIdentifiers",
           "path": "modules/classes/WikidataIdentifiers.yaml",
@@ -3445,6 +3585,11 @@
           "path": "modules/classes/WorldHeritageSite.yaml",
           "category": "class"
         },
+        {
+          "name": "XPath",
+          "path": "modules/classes/XPath.yaml",
+          "category": "class"
+        },
         {
           "name": "YoutubeChannel",
           "path": "modules/classes/YoutubeChannel.yaml",
@@ -3896,6 +4041,16 @@
           "path": "modules/enums/LocationResolutionMethodEnum.yaml",
           "category": "enum"
         },
+        {
+          "name": "MeasureUnitEnum",
+          "path": "modules/enums/MeasureUnitEnum.yaml",
+          "category": "enum"
+        },
+        {
+          "name": "MethodologyTypeEnum",
+          "path": "modules/enums/MethodologyTypeEnum.yaml",
+          "category": "enum"
+        },
         {
           "name": "METSIdentifierTypeEnum",
           "path": "modules/enums/METSIdentifierTypeEnum.yaml",
@@ -4242,6 +4397,11 @@
       "name": "slot",
       "displayName": "Slots",
       "files": [
+        {
+          "name": "accepts_or_accepted",
+          "path": "modules/slots/accepts_or_accepted.yaml",
+          "category": "slot"
+        },
         {
           "name": "accepts_or_accepted_external_work",
           "path": "modules/slots/accepts_or_accepted_external_work.yaml",
@@ -4278,13 +4438,8 @@
           "category": "slot"
         },
         {
-          "name": "annual_participants",
+          "name": "applies_or_applied_to_call",
-          "path": "modules/slots/annual_participants.yaml",
+          "path": "modules/slots/applies_or_applied_to_call.yaml",
-          "category": "slot"
-        },
-        {
-          "name": "applies_to_call",
-          "path": "modules/slots/applies_to_call.yaml",
           "category": "slot"
         },
         {
@@ -4293,18 +4448,8 @@
           "category": "slot"
         },
         {
-          "name": "area_hectares",
+          "name": "asserts_or_asserted",
-          "path": "modules/slots/area_hectares.yaml",
+          "path": "modules/slots/asserts_or_asserted.yaml",
-          "category": "slot"
-        },
-        {
-          "name": "arrangement_notes",
-          "path": "modules/slots/arrangement_notes.yaml",
-          "category": "slot"
-        },
-        {
-          "name": "available_caption_languages",
-          "path": "modules/slots/available_caption_languages.yaml",
           "category": "slot"
         },
         {
@@ -4322,11 +4467,6 @@
           "path": "modules/slots/begin_of_the_end.yaml",
           "category": "slot"
         },
-        {
-          "name": "beneficiary_group",
-          "path": "modules/slots/beneficiary_group.yaml",
-          "category": "slot"
-        },
         {
           "name": "benefit",
           "path": "modules/slots/benefit.yaml",
@@ -4357,21 +4497,6 @@
           "path": "modules/slots/bounding_box.yaml",
           "category": "slot"
         },
-        {
-          "name": "branch_head",
-          "path": "modules/slots/branch_head.yaml",
-          "category": "slot"
-        },
-        {
-          "name": "budget_currency",
-          "path": "modules/slots/budget_currency.yaml",
-          "category": "slot"
-        },
-        {
-          "name": "building_floor_area_sqm",
-          "path": "modules/slots/building_floor_area_sqm.yaml",
-          "category": "slot"
-        },
         {
           "name": "business_criticality",
           "path": "modules/slots/business_criticality.yaml",
@@ -4387,6 +4512,11 @@
           "path": "modules/slots/cached_token.yaml",
           "category": "slot"
         },
+        {
+          "name": "calendar_system",
+          "path": "modules/slots/calendar_system.yaml",
+          "category": "slot"
+        },
         {
           "name": "call_description",
           "path": "modules/slots/call_description.yaml",
@@ -5842,6 +5972,16 @@
           "path": "modules/slots/description_section.yaml",
           "category": "slot"
         },
+        {
+          "name": "description_text",
+          "path": "modules/slots/description_text.yaml",
+          "category": "slot"
+        },
+        {
+          "name": "description_type",
+          "path": "modules/slots/description_type.yaml",
+          "category": "slot"
+        },
         {
           "name": "detection_count",
           "path": "modules/slots/detection_count.yaml",
@@ -6292,6 +6432,11 @@
           "path": "modules/slots/endowment_draw.yaml",
           "category": "slot"
         },
+        {
+          "name": "ends_or_ended_at_location",
+          "path": "modules/slots/ends_or_ended_at_location.yaml",
+          "category": "slot"
+        },
         {
           "name": "engagement_rate",
           "path": "modules/slots/engagement_rate.yaml",
@@ -7557,11 +7702,6 @@
           "path": "modules/slots/has_archive_subtype.yaml",
           "category": "slot"
         },
-        {
-          "name": "has_area_in_hectare",
-          "path": "modules/slots/has_area_in_hectare.yaml",
-          "category": "slot"
-        },
         {
           "name": "has_arrangement",
           "path": "modules/slots/has_arrangement.yaml",
@@ -8092,6 +8232,11 @@
           "path": "modules/slots/has_or_had_archive_scope.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_area",
+          "path": "modules/slots/has_or_had_area.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_or_had_area_served",
           "path": "modules/slots/has_or_had_area_served.yaml",
@@ -8157,6 +8302,11 @@
           "path": "modules/slots/has_or_had_based_on_observation.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_beneficiary",
+          "path": "modules/slots/has_or_had_beneficiary.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_or_had_category_assessment",
           "path": "modules/slots/has_or_had_category_assessment.yaml",
@@ -8167,6 +8317,11 @@
           "path": "modules/slots/has_or_had_chapter.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_code",
+          "path": "modules/slots/has_or_had_code.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_or_had_collection",
           "path": "modules/slots/has_or_had_collection.yaml",
@@ -8177,6 +8332,11 @@
           "path": "modules/slots/has_or_had_collection_narrower_type.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_comment",
+          "path": "modules/slots/has_or_had_comment.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_or_had_comment_reply",
           "path": "modules/slots/has_or_had_comment_reply.yaml",
@@ -8197,11 +8357,21 @@
           "path": "modules/slots/has_or_had_conservation_record.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_conversion_rate",
+          "path": "modules/slots/has_or_had_conversion_rate.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_or_had_curation_activity",
           "path": "modules/slots/has_or_had_curation_activity.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_currency",
+          "path": "modules/slots/has_or_had_currency.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_or_had_custodian",
           "path": "modules/slots/has_or_had_custodian.yaml",
@@ -8342,6 +8512,11 @@
           "path": "modules/slots/has_or_had_external_resource.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_facility",
+          "path": "modules/slots/has_or_had_facility.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_or_had_featured_item",
           "path": "modules/slots/has_or_had_featured_item.yaml",
@@ -8362,6 +8537,16 @@
           "path": "modules/slots/has_or_had_fond.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_format",
+          "path": "modules/slots/has_or_had_format.yaml",
+          "category": "slot"
+        },
+        {
+          "name": "has_or_had_frequency",
+          "path": "modules/slots/has_or_had_frequency.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_or_had_function",
           "path": "modules/slots/has_or_had_function.yaml",
@@ -8372,6 +8557,11 @@
           "path": "modules/slots/has_or_had_generate.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_head",
+          "path": "modules/slots/has_or_had_head.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_or_had_holds_record_set_type",
           "path": "modules/slots/has_or_had_holds_record_set_type.yaml",
@@ -8467,6 +8657,11 @@
           "path": "modules/slots/has_or_had_manages_collection.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_measurement_unit",
+          "path": "modules/slots/has_or_had_measurement_unit.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_or_had_member",
           "path": "modules/slots/has_or_had_member.yaml",
@@ -8482,6 +8677,11 @@
           "path": "modules/slots/has_or_had_membership.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_methodology",
+          "path": "modules/slots/has_or_had_methodology.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_or_had_music_segment",
           "path": "modules/slots/has_or_had_music_segment.yaml",
@@ -8502,6 +8702,11 @@
           "path": "modules/slots/has_or_had_open_access_endpoint.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_opening_hour",
+          "path": "modules/slots/has_or_had_opening_hour.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_or_had_operate",
           "path": "modules/slots/has_or_had_operate.yaml",
@@ -8552,6 +8757,11 @@
           "path": "modules/slots/has_or_had_place_of_birth.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_policy",
+          "path": "modules/slots/has_or_had_policy.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_or_had_portal_data_source",
           "path": "modules/slots/has_or_had_portal_data_source.yaml",
@@ -8582,6 +8792,11 @@
           "path": "modules/slots/has_or_had_product_category.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_program",
+          "path": "modules/slots/has_or_had_program.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_or_had_project",
           "path": "modules/slots/has_or_had_project.yaml",
@@ -8597,11 +8812,21 @@
           "path": "modules/slots/has_or_had_provenance_event.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_provenance_path",
+          "path": "modules/slots/has_or_had_provenance_path.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_or_had_quantity",
           "path": "modules/slots/has_or_had_quantity.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_rationale",
+          "path": "modules/slots/has_or_had_rationale.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_or_had_registered_dataset",
           "path": "modules/slots/has_or_had_registered_dataset.yaml",
@@ -8652,6 +8877,11 @@
           "path": "modules/slots/has_or_had_research_attempt.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_restriction",
+          "path": "modules/slots/has_or_had_restriction.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_or_had_resulting_unit",
           "path": "modules/slots/has_or_had_resulting_unit.yaml",
@@ -8667,6 +8897,16 @@
           "path": "modules/slots/has_or_had_scene_segment.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_scope",
+          "path": "modules/slots/has_or_had_scope.yaml",
+          "category": "slot"
+        },
+        {
+          "name": "has_or_had_score",
+          "path": "modules/slots/has_or_had_score.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_or_had_secondary_label",
           "path": "modules/slots/has_or_had_secondary_label.yaml",
@@ -8682,6 +8922,11 @@
           "path": "modules/slots/has_or_had_section_link.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_security_level",
+          "path": "modules/slots/has_or_had_security_level.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_or_had_segment",
           "path": "modules/slots/has_or_had_segment.yaml",
@@ -8692,6 +8937,11 @@
           "path": "modules/slots/has_or_had_series.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_service",
+          "path": "modules/slots/has_or_had_service.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_or_had_service_area",
           "path": "modules/slots/has_or_had_service_area.yaml",
@@ -8782,6 +9032,11 @@
           "path": "modules/slots/has_or_had_suborganization.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_text",
+          "path": "modules/slots/has_or_had_text.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_or_had_text_region",
           "path": "modules/slots/has_or_had_text_region.yaml",
@@ -8797,6 +9052,11 @@
           "path": "modules/slots/has_or_had_thematic_route.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_time_interval",
+          "path": "modules/slots/has_or_had_time_interval.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_or_had_tracked_in_cm",
           "path": "modules/slots/has_or_had_tracked_in_cm.yaml",
@@ -8812,6 +9072,16 @@
           "path": "modules/slots/has_or_had_type.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_unit",
+          "path": "modules/slots/has_or_had_unit.yaml",
+          "category": "slot"
+        },
+        {
+          "name": "has_or_had_url",
+          "path": "modules/slots/has_or_had_url.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_or_had_used_source",
           "path": "modules/slots/has_or_had_used_source.yaml",
@@ -8822,6 +9092,11 @@
           "path": "modules/slots/has_or_had_web_claim.yaml",
           "category": "slot"
         },
+        {
+          "name": "has_or_had_writing_system",
+          "path": "modules/slots/has_or_had_writing_system.yaml",
+          "category": "slot"
+        },
         {
           "name": "has_outdoor_seating",
           "path": "modules/slots/has_outdoor_seating.yaml",
@@ -9562,11 +9837,41 @@
           "path": "modules/slots/is_or_was_created_through.yaml",
           "category": "slot"
         },
+        {
+          "name": "is_or_was_derived_from",
+          "path": "modules/slots/is_or_was_derived_from.yaml",
+          "category": "slot"
+        },
         {
           "name": "is_or_was_encompassed_by",
           "path": "modules/slots/is_or_was_encompassed_by.yaml",
           "category": "slot"
         },
+        {
+          "name": "is_or_was_equivalent_to",
+          "path": "modules/slots/is_or_was_equivalent_to.yaml",
+          "category": "slot"
+        },
+        {
+          "name": "is_or_was_generated_by",
+          "path": "modules/slots/is_or_was_generated_by.yaml",
+          "category": "slot"
+        },
+        {
+          "name": "is_or_was_instance_of",
+          "path": "modules/slots/is_or_was_instance_of.yaml",
+          "category": "slot"
+        },
+        {
+          "name": "is_or_was_located_within",
+          "path": "modules/slots/is_or_was_located_within.yaml",
+          "category": "slot"
+        },
+        {
+          "name": "is_or_was_managed_by",
+          "path": "modules/slots/is_or_was_managed_by.yaml",
+          "category": "slot"
+        },
         {
           "name": "is_or_was_member_of",
           "path": "modules/slots/is_or_was_member_of.yaml",
@@ -9592,6 +9897,11 @@
           "path": "modules/slots/is_or_was_required.yaml",
           "category": "slot"
         },
+        {
+          "name": "is_or_was_revision_of",
+          "path": "modules/slots/is_or_was_revision_of.yaml",
+          "category": "slot"
+        },
         {
           "name": "is_or_was_sub_collection_of",
           "path": "modules/slots/is_or_was_sub_collection_of.yaml",
@@ -9607,6 +9917,16 @@
           "path": "modules/slots/is_or_was_succeeded_by.yaml",
           "category": "slot"
         },
+        {
+          "name": "is_or_was_transferred",
+          "path": "modules/slots/is_or_was_transferred.yaml",
+          "category": "slot"
+        },
+        {
+          "name": "is_or_was_webarchived_at",
+          "path": "modules/slots/is_or_was_webarchived_at.yaml",
+          "category": "slot"
+        },
         {
           "name": "is_overlapping",
           "path": "modules/slots/is_overlapping.yaml",
@@ -10217,6 +10537,11 @@
           "path": "modules/slots/location_browse_score.yaml",
           "category": "slot"
         },
+        {
+          "name": "location_name",
+          "path": "modules/slots/location_name.yaml",
+          "category": "slot"
+        },
         {
           "name": "logo_bbox",
           "path": "modules/slots/logo_bbox.yaml",
@@ -11507,6 +11832,11 @@
           "path": "modules/slots/policy_review_date.yaml",
           "category": "slot"
         },
+        {
+          "name": "policy_text",
+          "path": "modules/slots/policy_text.yaml",
+          "category": "slot"
+        },
         {
           "name": "portal_description",
           "path": "modules/slots/portal_description.yaml",
@@ -11987,6 +12317,11 @@
           "path": "modules/slots/provides_access_to.yaml",
           "category": "slot"
         },
+        {
+          "name": "provides_or_provided_provenance_to",
+          "path": "modules/slots/provides_or_provided_provenance_to.yaml",
+          "category": "slot"
+        },
         {
           "name": "public_access",
           "path": "modules/slots/public_access.yaml",
@@ -13347,6 +13682,11 @@
           "path": "modules/slots/started_at_time.yaml",
           "category": "slot"
         },
+        {
+          "name": "starts_or_started_at_location",
+          "path": "modules/slots/starts_or_started_at_location.yaml",
+          "category": "slot"
+        },
         {
           "name": "statement_currency",
           "path": "modules/slots/statement_currency.yaml",
@@ -13777,6 +14117,16 @@
           "path": "modules/slots/time_of_destruction.yaml",
           "category": "slot"
         },
+        {
+          "name": "timestamp_precision",
+          "path": "modules/slots/timestamp_precision.yaml",
+          "category": "slot"
+        },
+        {
+          "name": "timestamp_value",
+          "path": "modules/slots/timestamp_value.yaml",
+          "category": "slot"
+        },
         {
           "name": "title",
           "path": "modules/slots/title.yaml",
@@ -14057,16 +14407,6 @@
           "path": "modules/slots/uniform_title.yaml",
           "category": "slot"
         },
-        {
-          "name": "unique_face_count",
-          "path": "modules/slots/unique_face_count.yaml",
-          "category": "slot"
-        },
-        {
-          "name": "unique_object_count",
-          "path": "modules/slots/unique_object_count.yaml",
-          "category": "slot"
-        },
         {
           "name": "unit_affiliation",
           "path": "modules/slots/unit_affiliation.yaml",
@@ -14097,11 +14437,6 @@
           "path": "modules/slots/unit_type.yaml",
           "category": "slot"
         },
-        {
-          "name": "update_frequency",
-          "path": "modules/slots/update_frequency.yaml",
-          "category": "slot"
-        },
         {
           "name": "updated_at",
           "path": "modules/slots/updated_at.yaml",
@@ -14112,6 +14447,16 @@
           "path": "modules/slots/url.yaml",
           "category": "slot"
         },
+        {
+          "name": "url_type",
+          "path": "modules/slots/url_type.yaml",
+          "category": "slot"
+        },
+        {
+          "name": "url_value",
+          "path": "modules/slots/url_value.yaml",
+          "category": "slot"
+        },
         {
           "name": "used",
           "path": "modules/slots/used.yaml",
@@ -14222,26 +14567,11 @@
           "path": "modules/slots/video_id.yaml",
           "category": "slot"
         },
-        {
-          "name": "view_count",
-          "path": "modules/slots/view_count.yaml",
-          "category": "slot"
-        },
         {
           "name": "visiting_hour",
           "path": "modules/slots/visiting_hour.yaml",
           "category": "slot"
         },
-        {
-          "name": "visitor_conversion_rate",
-          "path": "modules/slots/visitor_conversion_rate.yaml",
-          "category": "slot"
-        },
-        {
-          "name": "visitor_count",
-          "path": "modules/slots/visitor_count.yaml",
-          "category": "slot"
-        },
         {
           "name": "visitor_facility",
           "path": "modules/slots/visitor_facility.yaml",
@@ -14347,6 +14677,11 @@
           "path": "modules/slots/wikidata_class.yaml",
           "category": "slot"
         },
+        {
+          "name": "wikidata_description",
+          "path": "modules/slots/wikidata_description.yaml",
+          "category": "slot"
+        },
         {
           "name": "wikidata_entity",
           "path": "modules/slots/wikidata_entity.yaml",
@@ -14372,6 +14707,11 @@
           "path": "modules/slots/wikidata_id.yaml",
           "category": "slot"
         },
+        {
+          "name": "wikidata_label",
+          "path": "modules/slots/wikidata_label.yaml",
+          "category": "slot"
+        },
         {
           "name": "wikidata_mapping",
           "path": "modules/slots/wikidata_mapping.yaml",
@@ -14382,6 +14722,11 @@
           "path": "modules/slots/wikidata_mapping_rationale.yaml",
           "category": "slot"
         },
+        {
+          "name": "wikidata_qid",
+          "path": "modules/slots/wikidata_qid.yaml",
+          "category": "slot"
+        },
         {
           "name": "within_auxiliary_place",
           "path": "modules/slots/within_auxiliary_place.yaml",

frontend/public/schemas/20251121/linkml/modules/classes/Alpha2Code.yaml

@@ -0,0 +1,68 @@
+# Alpha2Code - ISO 3166-1 alpha-2 country code
+#
+# Created per slot_fixes.yaml migration for: alpha_2
+# Creation date: 2026-01-14
+# Rule compliance: 50 (ontology mapping)
+
+id: https://nde.nl/ontology/hc/class/Alpha2Code
+name: Alpha2Code
+title: ISO 3166-1 Alpha-2 Country Code
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  skos: http://www.w3.org/2004/02/skos/core#
+  schema: http://schema.org/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ../slots/has_or_had_code
+
+classes:
+  Alpha2Code:
+    class_uri: skos:Concept
+    description: |
+      ISO 3166-1 alpha-2 country code (two-letter code).
+      
+      **DEFINITION**:
+      
+      A two-letter country code as defined by ISO 3166-1 alpha-2 standard.
+      Used for representing countries and dependent territories.
+      
+      **EXAMPLES**:
+      - NL = Netherlands
+      - BE = Belgium
+      - DE = Germany
+      - US = United States
+      
+      **ONTOLOGY ALIGNMENT**:
+      - SKOS Concept: Codes are concepts in ISO 3166-1 vocabulary
+      - Schema.org: addressCountry can use alpha-2 codes
+      
+    slots:
+      - has_or_had_code
+    
+    slot_usage:
+      has_or_had_code:
+        pattern: "^[A-Z]{2}$"
+        required: true
+        description: Two-letter ISO 3166-1 alpha-2 country code
+        examples:
+          - value: "NL"
+            description: Netherlands
+          - value: "BE"
+            description: Belgium
+    
+    exact_mappings:
+      - skos:Concept
+    
+    annotations:
+      specificity_score: "0.30"
+      specificity_rationale: "Low specificity - standard country codes used broadly."
+    
+    examples:
+      - value:
+          has_or_had_code: "NL"
+        description: Netherlands country code

frontend/public/schemas/20251121/linkml/modules/classes/Alpha3Code.yaml

@@ -0,0 +1,68 @@
+# Alpha3Code - ISO 3166-1 alpha-3 country code
+#
+# Created per slot_fixes.yaml migration for: alpha_3
+# Creation date: 2026-01-14
+# Rule compliance: 50 (ontology mapping)
+
+id: https://nde.nl/ontology/hc/class/Alpha3Code
+name: Alpha3Code
+title: ISO 3166-1 Alpha-3 Country Code
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  skos: http://www.w3.org/2004/02/skos/core#
+  schema: http://schema.org/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ../slots/has_or_had_code
+
+classes:
+  Alpha3Code:
+    class_uri: skos:Concept
+    description: |
+      ISO 3166-1 alpha-3 country code (three-letter code).
+      
+      **DEFINITION**:
+      
+      A three-letter country code as defined by ISO 3166-1 alpha-3 standard.
+      Used for representing countries and dependent territories with more
+      recognizable abbreviations.
+      
+      **EXAMPLES**:
+      - NLD = Netherlands
+      - BEL = Belgium
+      - DEU = Germany
+      - USA = United States
+      
+      **ONTOLOGY ALIGNMENT**:
+      - SKOS Concept: Codes are concepts in ISO 3166-1 vocabulary
+      
+    slots:
+      - has_or_had_code
+    
+    slot_usage:
+      has_or_had_code:
+        pattern: "^[A-Z]{3}$"
+        required: true
+        description: Three-letter ISO 3166-1 alpha-3 country code
+        examples:
+          - value: "NLD"
+            description: Netherlands
+          - value: "BEL"
+            description: Belgium
+    
+    exact_mappings:
+      - skos:Concept
+    
+    annotations:
+      specificity_score: "0.30"
+      specificity_rationale: "Low specificity - standard country codes used broadly."
+    
+    examples:
+      - value:
+          has_or_had_code: "NLD"
+        description: Netherlands country code

frontend/public/schemas/20251121/linkml/modules/classes/ConversionRate.yaml

@@ -0,0 +1,189 @@
+# ConversionRate - Structured conversion rate measurement
+# Created per slot_fixes.yaml migration for: visitor_conversion_rate
+# Creation date: 2026-01-14
+#
+# REVISION FROM slot_fixes.yaml (lines 1646-1669):
+#   - label: has_or_had_conversion_rate (slot)
+#   - label: ConversionRate (class) ← THIS FILE
+#   - link_branch 1: has_or_had_type → ConversionRateType → ConversionRateTypes
+#   - link_branch 2: temporal_extent → TimeSpan
+
+id: https://nde.nl/ontology/hc/classes/ConversionRate
+name: ConversionRate
+title: ConversionRate
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  xsd: http://www.w3.org/2001/XMLSchema#
+
+imports:
+  - linkml:types
+  - ./ConversionRateType
+  - ./ConversionRateTypes
+  - ./TimeSpan
+  - ../slots/has_or_had_type
+  - ../slots/temporal_extent
+
+default_range: string
+
+classes:
+  ConversionRate:
+    description: >-
+      Structured representation of a conversion rate metric for heritage institutions.
+      
+      **WHY A DEDICATED CLASS?**
+      
+      Conversion rates are more than simple floats - they need:
+      - **Type**: What kind of conversion (visitor-to-purchase, visitor-to-member)
+      - **Value**: The actual percentage (0.35 = 35%)
+      - **Time Period**: When this rate was measured
+      - **Context**: Comparison benchmarks, notes
+      
+      **SLOT_FIXES.YAML REVISION** (lines 1646-1669):
+      - Branch 1: has_or_had_type → ConversionRateType/ConversionRateTypes
+      - Branch 2: temporal_extent → TimeSpan (measurement period)
+      
+      **USE CASES**:
+      - Gift shop performance: 35% visitor-to-purchase conversion
+      - Membership drives: 5% visitor-to-member conversion
+      - Digital engagement: 3% website-to-visit conversion
+      
+      **ONTOLOGY MAPPING**:
+      - class_uri: schema:QuantitativeValue (numeric measurement)
+      - Uses schema:interactionStatistic for behavioral metrics
+      
+    class_uri: schema:QuantitativeValue
+    
+    exact_mappings:
+      - schema:QuantitativeValue
+    
+    close_mappings:
+      - schema:interactionStatistic
+    
+    slots:
+      - has_or_had_type
+      - temporal_extent
+    
+    attributes:
+      rate_value:
+        range: float
+        required: true
+        description: >-
+          The conversion rate as a decimal (0.35 = 35%).
+          Always expressed as proportion between 0.0 and 1.0.
+        minimum_value: 0.0
+        maximum_value: 1.0
+      
+      rate_percentage:
+        range: float
+        description: >-
+          The conversion rate as a percentage (35 = 35%).
+          Calculated field: rate_value × 100.
+        minimum_value: 0.0
+        maximum_value: 100.0
+      
+      sample_size:
+        range: integer
+        description: >-
+          The number of observations in the denominator (total visitors, emails sent, etc.).
+          Required for statistical significance assessment.
+      
+      converted_count:
+        range: integer
+        description: >-
+          The number of successful conversions (numerator).
+          Required for statistical significance assessment.
+      
+      measurement_period_description:
+        range: string
+        description: >-
+          Human-readable description of the measurement period.
+          Examples: "Q1 2025", "Calendar Year 2024", "Exhibition period"
+      
+      benchmark_comparison:
+        range: string
+        description: >-
+          How this rate compares to industry benchmarks.
+          Examples: "Above average", "Top quartile", "Below benchmark"
+      
+      notes:
+        range: string
+        description: >-
+          Additional context about this conversion rate measurement.
+          Examples: Special circumstances, data collection methodology.
+    
+    slot_usage:
+      has_or_had_type:
+        range: ConversionRateType
+        inlined: true
+        description: >-
+          The type of conversion being measured.
+          Use concrete types from ConversionRateTypes (VisitorToPurchaseConversion, etc.)
+        examples:
+          - value: |
+              has_or_had_type:
+                type_label: "Visitor to Purchase"
+                source_population: "museum visitors"
+                target_action: "made gift shop purchase"
+            description: Visitor to purchase conversion type
+      
+      temporal_extent:
+        range: TimeSpan
+        inlined: true
+        description: >-
+          The time period during which this conversion rate was measured.
+          Use begin/end dates to specify the measurement window.
+        examples:
+          - value: |
+              temporal_extent:
+                begin_of_the_begin: "2024-01-01"
+                end_of_the_end: "2024-12-31"
+            description: Calendar year 2024 measurement period
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: >-
+        Conversion rates applicable to all custodian types with retail or engagement.
+      custodian_types_primary: "*"
+      specificity_score: 0.45
+      specificity_rationale: >-
+        Moderate specificity - relevant to custodians tracking performance metrics.
+    
+    examples:
+      - value: |
+          ConversionRate:
+            rate_value: 0.35
+            rate_percentage: 35.0
+            sample_size: 500000
+            converted_count: 175000
+            has_or_had_type:
+              type_label: "Visitor to Purchase"
+            temporal_extent:
+              begin_of_the_begin: "2024-01-01"
+              end_of_the_end: "2024-12-31"
+            measurement_period_description: "Calendar Year 2024"
+            benchmark_comparison: "Above average (industry avg 15-25%)"
+        description: Gift shop 35% visitor-to-purchase conversion rate.
+      
+      - value: |
+          ConversionRate:
+            rate_value: 0.05
+            rate_percentage: 5.0
+            sample_size: 100000
+            converted_count: 5000
+            has_or_had_type:
+              type_label: "Visitor to Member"
+            temporal_extent:
+              begin_of_the_begin: "2024-06-01"
+              end_of_the_end: "2024-08-31"
+            measurement_period_description: "Summer membership drive"
+            benchmark_comparison: "Strong (industry avg 1-3%)"
+        description: Summer membership campaign with 5% conversion.
+    
+    comments:
+      - Created from slot_fixes.yaml migration (2026-01-14)
+      - Replaces simple float visitor_conversion_rate slot
+      - Supports multiple conversion types with industry benchmarks
+      - Temporal extent enables trend analysis over time

frontend/public/schemas/20251121/linkml/modules/classes/ConversionRateType.yaml

@@ -0,0 +1,99 @@
+# ConversionRateType - Abstract base class for conversion rate types
+# Created per slot_fixes.yaml migration for: visitor_conversion_rate
+# Creation date: 2026-01-14
+#
+# NAMING CONVENTION (Rule 0b):
+# - ConversionRateType.yaml = Abstract base class (this file)
+# - ConversionRateTypes.yaml = Concrete subclasses
+
+id: https://nde.nl/ontology/hc/classes/ConversionRateType
+name: ConversionRateType
+title: ConversionRateType
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  skos: http://www.w3.org/2004/02/skos/core#
+
+imports:
+  - linkml:types
+
+default_range: string
+
+classes:
+  ConversionRateType:
+    abstract: true
+    description: >-
+      Abstract base class for types of conversion rates measured in heritage contexts.
+      
+      **TYPE TAXONOMY**:
+      
+      Conversion rates measure the percentage of one group that performs a specific action:
+      - **Visitor to Purchase**: Museum visitors who buy from gift shop
+      - **Visitor to Member**: Visitors who become members
+      - **Online to Visit**: Website visitors who visit physically
+      - **Email to Click**: Email recipients who click links
+      - **Social to Follower**: Social media viewers who follow
+      
+      **NAMING CONVENTION** (Rule 0b):
+      - This file: Abstract `ConversionRateType` base class
+      - ConversionRateTypes.yaml: Concrete subclasses
+      
+      **ONTOLOGY MAPPING**:
+      - class_uri: skos:Concept (type taxonomy concept)
+      - Part of SKOS-based classification scheme
+      
+    class_uri: skos:Concept
+    
+    exact_mappings:
+      - skos:Concept
+    
+    attributes:
+      type_id:
+        range: uriorcurie
+        identifier: true
+        description: Unique identifier for this conversion rate type.
+      
+      type_label:
+        range: string
+        required: true
+        description: Human-readable label for this conversion rate type.
+      
+      type_description:
+        range: string
+        description: Detailed description of what this conversion rate measures.
+      
+      source_population:
+        range: string
+        description: >-
+          The group being measured (denominator).
+          Examples: "museum visitors", "website visitors", "email recipients"
+      
+      target_action:
+        range: string
+        description: >-
+          The action being measured (numerator).
+          Examples: "made purchase", "became member", "clicked link"
+      
+      industry_benchmark_low:
+        range: float
+        description: Low end of industry benchmark for this conversion type.
+      
+      industry_benchmark_high:
+        range: float
+        description: High end of industry benchmark for this conversion type.
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: >-
+        Conversion rate types applicable to all custodian types with retail or engagement metrics.
+      custodian_types_primary: "*"
+      specificity_score: 0.45
+      specificity_rationale: >-
+        Moderate specificity - relevant to custodians tracking performance metrics.
+    
+    comments:
+      - Created from slot_fixes.yaml migration (2026-01-14)
+      - Abstract base class - see ConversionRateTypes.yaml for concrete types
+      - Used with ConversionRate class for structured metrics

frontend/public/schemas/20251121/linkml/modules/classes/ConversionRateTypes.yaml

@@ -0,0 +1,218 @@
+# ConversionRateTypes - Concrete subclasses of ConversionRateType
+# Created per slot_fixes.yaml migration for: visitor_conversion_rate
+# Creation date: 2026-01-14
+#
+# NAMING CONVENTION (Rule 0b):
+# - ConversionRateType.yaml = Abstract base class
+# - ConversionRateTypes.yaml = Concrete subclasses (this file)
+
+id: https://nde.nl/ontology/hc/classes/ConversionRateTypes
+name: ConversionRateTypes
+title: ConversionRateTypes
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  skos: http://www.w3.org/2004/02/skos/core#
+
+imports:
+  - linkml:types
+  - ./ConversionRateType
+
+default_range: string
+
+classes:
+  VisitorToPurchaseConversion:
+    is_a: ConversionRateType
+    description: >-
+      Conversion rate measuring museum/archive visitors who make a gift shop purchase.
+      
+      **INDUSTRY BENCHMARKS**:
+      - Average: 15-25%
+      - High performers: 30-40%
+      - Blockbuster exhibitions: 40-60%
+      
+      **CALCULATION**: (Purchasers / Total Visitors) × 100
+      
+    class_uri: hc:VisitorToPurchaseConversion
+    
+    attributes:
+      type_label:
+        range: string
+        ifabsent: "string(Visitor to Purchase)"
+      source_population:
+        range: string
+        ifabsent: "string(museum/venue visitors)"
+      target_action:
+        range: string
+        ifabsent: "string(made gift shop purchase)"
+      industry_benchmark_low:
+        range: float
+        ifabsent: "float(0.15)"
+      industry_benchmark_high:
+        range: float
+        ifabsent: "float(0.40)"
+  
+  VisitorToMemberConversion:
+    is_a: ConversionRateType
+    description: >-
+      Conversion rate measuring visitors who become members/supporters.
+      
+      **INDUSTRY BENCHMARKS**:
+      - Average: 1-3%
+      - Strong programs: 5-8%
+      
+      **CALCULATION**: (New Members / Total Visitors) × 100
+      
+    class_uri: hc:VisitorToMemberConversion
+    
+    attributes:
+      type_label:
+        range: string
+        ifabsent: "string(Visitor to Member)"
+      source_population:
+        range: string
+        ifabsent: "string(museum/venue visitors)"
+      target_action:
+        range: string
+        ifabsent: "string(became member/supporter)"
+      industry_benchmark_low:
+        range: float
+        ifabsent: "float(0.01)"
+      industry_benchmark_high:
+        range: float
+        ifabsent: "float(0.08)"
+  
+  OnlineToPhysicalConversion:
+    is_a: ConversionRateType
+    description: >-
+      Conversion rate measuring website visitors who subsequently visit physically.
+      
+      **INDUSTRY BENCHMARKS**:
+      - Average: 0.5-2%
+      - Strong digital presence: 3-5%
+      
+      **CALCULATION**: (Physical Visits from Web / Website Visitors) × 100
+      
+    class_uri: hc:OnlineToPhysicalConversion
+    
+    attributes:
+      type_label:
+        range: string
+        ifabsent: "string(Online to Physical Visit)"
+      source_population:
+        range: string
+        ifabsent: "string(website visitors)"
+      target_action:
+        range: string
+        ifabsent: "string(visited venue physically)"
+      industry_benchmark_low:
+        range: float
+        ifabsent: "float(0.005)"
+      industry_benchmark_high:
+        range: float
+        ifabsent: "float(0.05)"
+  
+  EmailToClickConversion:
+    is_a: ConversionRateType
+    description: >-
+      Conversion rate measuring email recipients who click through.
+      
+      **INDUSTRY BENCHMARKS** (Museum sector):
+      - Average: 2-4%
+      - Well-targeted: 5-10%
+      
+      **CALCULATION**: (Clicks / Emails Delivered) × 100
+      
+    class_uri: hc:EmailToClickConversion
+    
+    attributes:
+      type_label:
+        range: string
+        ifabsent: "string(Email to Click)"
+      source_population:
+        range: string
+        ifabsent: "string(email recipients)"
+      target_action:
+        range: string
+        ifabsent: "string(clicked link in email)"
+      industry_benchmark_low:
+        range: float
+        ifabsent: "float(0.02)"
+      industry_benchmark_high:
+        range: float
+        ifabsent: "float(0.10)"
+  
+  SocialToFollowerConversion:
+    is_a: ConversionRateType
+    description: >-
+      Conversion rate measuring social media viewers who become followers.
+      
+      **INDUSTRY BENCHMARKS**:
+      - Average: 1-3%
+      - Viral content: 5-15%
+      
+      **CALCULATION**: (New Followers / Content Views) × 100
+      
+    class_uri: hc:SocialToFollowerConversion
+    
+    attributes:
+      type_label:
+        range: string
+        ifabsent: "string(Social to Follower)"
+      source_population:
+        range: string
+        ifabsent: "string(social media content viewers)"
+      target_action:
+        range: string
+        ifabsent: "string(became follower)"
+      industry_benchmark_low:
+        range: float
+        ifabsent: "float(0.01)"
+      industry_benchmark_high:
+        range: float
+        ifabsent: "float(0.15)"
+  
+  TicketToReturnConversion:
+    is_a: ConversionRateType
+    description: >-
+      Conversion rate measuring ticket buyers who return for another visit.
+      
+      **INDUSTRY BENCHMARKS**:
+      - Average: 20-30%
+      - Strong loyalty programs: 40-60%
+      
+      **CALCULATION**: (Return Visitors / Total Ticket Buyers) × 100
+      
+    class_uri: hc:TicketToReturnConversion
+    
+    attributes:
+      type_label:
+        range: string
+        ifabsent: "string(Ticket to Return Visit)"
+      source_population:
+        range: string
+        ifabsent: "string(ticket buyers)"
+      target_action:
+        range: string
+        ifabsent: "string(made return visit within 12 months)"
+      industry_benchmark_low:
+        range: float
+        ifabsent: "float(0.20)"
+      industry_benchmark_high:
+        range: float
+        ifabsent: "float(0.60)"
+
+  OtherConversion:
+    is_a: ConversionRateType
+    description: >-
+      Custom or other conversion rate type not covered by standard types.
+      Use this when tracking novel metrics or institution-specific conversions.
+      
+    class_uri: hc:OtherConversion
+    
+    attributes:
+      custom_type_name:
+        range: string
+        description: Name of the custom conversion type.

frontend/public/schemas/20251121/linkml/modules/classes/Description.yaml

@@ -0,0 +1,148 @@
+# Description class
+# Generic class for typed descriptions with language support
+#
+# Generation date: 2026-01-15
+# Rule compliance: 0 (LinkML single source of truth), 38 (slot centralization), 53 (slot_fixes.yaml authoritative)
+# Migration: Supports has_or_had_description slot (replaces binding_description, branch_description, etc.)
+#
+# This class supports 11 slot migrations per slot_fixes.yaml:
+# - binding_description
+# - branch_description
+# - branch_office_description
+# - budget_description
+# - zone_description
+# - warehouse_description
+# - unit_description
+# - type_description
+# - treatment_description (partial)
+# - transfer_location_text (partial)
+# - transfer_location (partial)
+
+id: https://nde.nl/ontology/hc/class/Description
+name: description_class
+title: Description Class
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  skos: http://www.w3.org/2004/02/skos/core#
+  rdfs: http://www.w3.org/2000/01/rdf-schema#
+  schema: http://schema.org/
+  dcterms: http://purl.org/dc/terms/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ../metadata
+  - ../slots/description_text
+  - ../slots/description_type
+  - ../slots/language
+  - ../slots/specificity_annotation
+  - ../slots/template_specificity
+  - ./SpecificityAnnotation
+  - ./TemplateSpecificityScores
+
+classes:
+  Description:
+    class_uri: dcterms:description
+    description: |
+      A typed description with optional language tagging and type metadata.
+      
+      **Purpose**:
+      Description provides a reusable class for representing textual descriptions
+      across the heritage custodian schema. Supports typed descriptions (binding,
+      branch, budget, zone, etc.) with language tagging.
+      
+      **Ontological Alignment**:
+      - **Primary**: `dcterms:description` - Dublin Core description
+      - **Close**: `skos:definition` - formal definition
+      - **Related**: `schema:description` - Schema.org description
+      
+      **Use Cases**:
+      - Binding descriptions for physical carriers
+      - Branch/office descriptions for organizational units
+      - Budget descriptions for financial records
+      - Zone/warehouse descriptions for storage facilities
+      - Type descriptions for classification explanations
+      
+      **Replaces** (per slot_fixes.yaml):
+      - `binding_description` (string)
+      - `branch_description` (string)
+      - `branch_office_description` (string)
+      - `budget_description` (string)
+      - `zone_description` (string)
+      - `warehouse_description` (string)
+      - `unit_description` (string)
+      - `type_description` (string)
+      
+    exact_mappings:
+      - dcterms:description
+    
+    close_mappings:
+      - skos:definition
+      - rdfs:comment
+    
+    related_mappings:
+      - schema:description
+    
+    slots:
+      - description_text
+      - description_type
+      - language
+      - specificity_annotation
+      - template_specificity
+    
+    slot_usage:
+      description_text:
+        description: |
+          The textual content of the description.
+        range: string
+        required: true
+      description_type:
+        description: |
+          The type of description (binding, branch, budget, zone, warehouse, unit, type, general).
+          This allows distinguishing different kinds of descriptions when multiple
+          apply to the same entity.
+        range: string
+        required: false
+        examples:
+          - value: binding
+            description: Physical binding description
+          - value: branch
+            description: Organizational branch description
+          - value: budget
+            description: Budget category description
+          - value: zone
+            description: Storage zone description
+      language:
+        description: |
+          ISO 639-1 two-letter language code for this description.
+          Examples: "en", "nl", "de", "fr"
+        range: string
+        required: false
+        pattern: "^[a-z]{2}$"
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: Generic description class applicable to all custodian types.
+      custodian_types_primary: null
+      specificity_score: 0.2
+      specificity_rationale: Very broadly applicable generic class for textual descriptions.
+    
+    examples:
+      - value: |
+          description_text: "Climate-controlled storage zone with dedicated HVAC for archival materials. Maintains 65°F and 35% RH."
+          description_type: zone
+          language: en
+        description: "Zone description for archival storage facility"
+      - value: |
+          description_text: "Quarter leather binding with marbled boards, spine with five raised bands and gilt titling."
+          description_type: binding
+          language: en
+        description: "Binding description for a rare book"
+      - value: |
+          description_text: "Regional branch serving Noord-Holland province with specialized genealogy and notarial collections."
+          description_type: branch
+          language: en
+        description: "Branch description for organizational unit"

frontend/public/schemas/20251121/linkml/modules/classes/EnvironmentalZone.yaml

@@ -44,38 +44,46 @@ imports:
 classes:
   EnvironmentalZone:
     class_uri: hc:EnvironmentalZone
-    description: "A climate-controlled area within a storage facility with specific\nenvironmental parameters (temperature,\
+    description: >-
-      \ relative humidity, light levels,\nair quality).\n\n**DEFINITION**:\n\nAn EnvironmentalZone represents a physically\
+      A climate-controlled area within a storage facility with specific
-      \ distinct area within a\nstorage facility that maintains specific environmental conditions.\nDifferent collection types\
+      environmental parameters (temperature, relative humidity, light levels,
-      \ require different zones based on their\nmaterial composition and preservation requirements.\n\nExamples include:\n\
+      air quality).
-      - Climate-controlled archive rooms (18°C, 50% RH)\n- Cold storage vaults for film (-5°C to +4°C)\n- Photographic materials\
+
-      \ storage (15°C, 35% RH)\n- Textile storage (stable RH, low light)\n- General collection storage (ambient controlled)\n\
+      DEFINITION:
-      \n**Wikidata Alignment**:\n- Q1759899 (climate control)\n\n**HC Ontology Extension (hc-storage.ttl)**:\n\nPrimary class:\
+      An EnvironmentalZone represents a physically distinct area within a
-      \ `hc:EnvironmentalZone` (subclass of `crm:E27_Site`)\n\nThe HC ontology provides environmental preset instances:\n\
+      storage facility that maintains specific environmental conditions.
-      - `hc:StandardArchiveEnvironment` - 18°C, 50% RH, 50 lux\n- `hc:PhotographicMaterialsEnvironment` - 15°C, 35% RH\n-\
+      Different collection types require different zones based on their
-      \ `hc:ColdStorageEnvironment` - -5°C, 30% RH\n- `hc:TextileStorageEnvironment` - 18°C, 50% RH, 15000 lux-hours/year\n\
+      material composition and preservation requirements.
-      \nKey HC properties for zones:\n- `hc:hasStorageSection` - Links zone to storage units\n- `hc:hasEnvironmentalRequirement`\
+
-      \ - Links to climate specs\n- `hc:meetsRequirement` - Indicates compliance\n- `hc:hasEnvironmentalObservation` - Links\
+      Examples include climate-controlled archive rooms (18C, 50% RH),
-      \ to sensor readings\n- `hc:monitoredByPlatform` - Links to sensor systems\n\n**SOSA/SSN Integration**:\n\nEnvironmental\
+      cold storage vaults for film (-5C to +4C), photographic materials
-      \ zones can be monitored using sensor networks:\n- Zone is a `sosa:FeatureOfInterest`\n- Observations are `hc:StorageEnvironmentObservation`\n\
+      storage (15C, 35% RH), textile storage (stable RH, low light),
-      - Sensors are hosted on `hc:EnvironmentalSensorPlatform`\n\nSee: `frontend/public/ontology/hc-storage.ttl`\n\n**CIDOC-CRM\
+      and general collection storage (ambient controlled).
-      \ Alignment (v7.1.3)**:\n\nBase class: `crm:E27_Site` - Zones are physical locations.\n\nHierarchy:\n```\nStorageFacility\
+
-      \ (hc:StorageFacility)\n  └── P59 has_section → EnvironmentalZone (hc:EnvironmentalZone)\n        ├── hc:hasEnvironmentalRequirement\
+      Wikidata Alignment: Q1759899 (climate control).
-      \ → EnvironmentalRequirement\n        ├── hc:hasEnvironmentalObservation → StorageEnvironmentObservation[]\n       \
+
-      \ └── P59 has_section → StorageUnit[]\n```\n\n**RELATIONSHIP TO OTHER CLASSES**:\n\n```\nStorage (facility)\n  │\n \
+      HC Ontology Extension (hc-storage.ttl):
-\ └── has_section → EnvironmentalZone[] (THIS CLASS)\n        │\n        ├── has_or_had_type (EnvironmentalZoneType - class\
+      Primary class hc:EnvironmentalZone (subclass of crm:E27_Site).
-       \ hierarchy)\n        ├── environmental_requirement → StorageConditionPolicy\n        ├── observations → StorageCondition[]\n\
+      Provides environmental preset instances including
-      \        ├── monitoring_platform (sensor system info)\n        │\n        └── has_section → StorageUnit[]\n        \
+      hc:StandardArchiveEnvironment (18C, 50% RH, 50 lux),
-      \      └── stores_objects → HeritageObject[]\n```\n\n**ENVIRONMENTAL STANDARDS REFERENCE**:\n\n| Material Type | Temperature\
+      hc:PhotographicMaterialsEnvironment (15C, 35% RH),
-      \ | RH | Light | Standard |\n|---------------|------------|-----|-------|----------|\n| Paper/archives | 16-20°C | 45-55%\
+      hc:ColdStorageEnvironment (-5C, 30% RH),
-      \ | <50 lux | ISO 11799 |\n| Photographs | 10-18°C | 30-40% | <50 lux | ISO 18934 |\n| Film (B&W) | -5°C | 30% | dark\
+      hc:TextileStorageEnvironment (18C, 50% RH, 15000 lux-hours/year).
-      \ | ISO 18911 |\n| Film (color) | -20°C | 30% | dark | ISO 18911 |\n| Textiles | 15-20°C | 45-55% | <50 lux | varies\
+
-      \ |\n| Metals | 15-25°C | <35% | varies | varies |\n\n**USE CASES**:\n\n1. **Standard Archive Zone**:\n   - zone_type:\
+      Key HC properties: hc:hasStorageSection (links zone to storage units),
-      \ ARCHIVE_STANDARD\n   - target_temperature: 18°C\n   - target_humidity: 50%\n   - max_light: 50 lux\n   - environmental_requirement:\
+      hc:hasEnvironmentalRequirement (links to climate specs),
-      \ hc:StandardArchiveEnvironment\n   \n2. **Cold Storage Vault**:\n   - zone_type: COLD_STORAGE\n   - target_temperature:\
+      hc:meetsRequirement (indicates compliance),
-      \ -5°C\n   - target_humidity: 30%\n   - environmental_requirement: hc:ColdStorageEnvironment\n   \n3. **Photographic\
+      hc:hasEnvironmentalObservation (links to sensor readings),
-      \ Materials Zone**:\n   - zone_type: PHOTOGRAPHIC\n   - target_temperature: 15°C\n   - target_humidity: 35%\n   - max_light:\
+      hc:monitoredByPlatform (links to sensor systems).
-      \ 50 lux\n"
+
+      SOSA/SSN Integration: Environmental zones can be monitored using
+      sensor networks where Zone is a sosa:FeatureOfInterest,
+      Observations are hc:StorageEnvironmentObservation, and
+      Sensors are hosted on hc:EnvironmentalSensorPlatform.
+
+      CIDOC-CRM Alignment (v7.1.3): Base class crm:E27_Site - Zones are
+      physical locations. StorageFacility has_section EnvironmentalZone
+      which has_section StorageUnit.
     exact_mappings:
     - hc:EnvironmentalZone
     - crm:E27_Site

frontend/public/schemas/20251121/linkml/modules/classes/Exhibition.yaml

@@ -45,7 +45,8 @@ imports:
 - ../slots/specificity_annotation
 - ../slots/template_specificity
 - ../slots/traveling_venue
-- ../slots/visitor_count
+- ../slots/has_or_had_quantity
+- ./Quantity
 - ./SpecificityAnnotation
 - ./TemplateSpecificityScores
 default_prefix: hc
@@ -72,7 +73,7 @@ classes:
       \ for CIDOC-CRM\n   fuzzy temporal modeling (begin_of_the_begin, end_of_the_end, etc.)\n\n**Example**:\n\nThe \"Vermeer\"\
       \ exhibition at Rijksmuseum (Feb 10 - Jun 4, 2023):\n- exhibition_id: https://nde.nl/ontology/hc/exhibition/rijksmuseum-vermeer-2023\n\
       - exhibition_name: \"Vermeer\"\n- organized_by: [Rijksmuseum, Mauritshuis] (joint organization)\n- start_date: 2023-02-10\n\
-      - end_date: 2023-06-04\n- exhibition_type: BLOCKBUSTER\n- visitor_count: 650000\n- featured_objects: [Girl with a Pearl\
+      - end_date: 2023-06-04\n- exhibition_type: BLOCKBUSTER\n- has_or_had_quantity: (visitor count)\n- featured_objects: [Girl with a Pearl\
       \ Earring, The Milkmaid, View of Delft]\n- exhibition_catalogs: [Vermeer (2023) catalog]\n"
     exact_mappings:
     - schema:ExhibitionEvent
@@ -108,7 +109,7 @@ classes:
     - start_date
     - template_specificity
     - traveling_venue
-    - visitor_count
+    - has_or_had_quantity
     - wikidata_id
     slot_usage:
       exhibition_id:
@@ -213,12 +214,25 @@ classes:
         range: EventStatusEnum
         examples:
         - value: COMPLETED
-      visitor_count:
+      has_or_had_quantity:
         required: false
-        range: integer
+        range: Quantity
+        inlined: true
+        description: >-
+          Visitor count for the exhibition. RULE 53: Replaces deprecated
+          visitor_count integer slot with structured Quantity class.
         examples:
-        - value: 650000
+        - value:
-          description: Vermeer exhibition attendance
+            quantity_value: 650000
+            quantity_type: VISITOR_COUNT
+            has_or_had_measurement_unit:
+              unit_type: VISITOR
+              unit_symbol: "visitors"
+            temporal_extent:
+              begin_of_the_begin: "2023-02-10T00:00:00Z"
+              end_of_the_end: "2023-06-04T23:59:59Z"
+            has_or_had_description: Vermeer exhibition attendance
+          description: Exhibition visitor count with temporal extent
       exhibition_url:
         required: false
         range: uri
@@ -290,7 +304,7 @@ classes:
     - Links to ExhibitedObject via featured_objects for typed object references
     - Links to ExhibitionCatalog via exhibition_catalogs for publication metadata
     - Use exhibition_type to categorize (permanent, temporary, traveling, etc.)
-    - visitor_count tracks attendance for completed exhibitions
+    - RULE 53: has_or_had_quantity replaces deprecated visitor_count for attendance
     - featured_works (string) retained for backward compatibility; prefer featured_objects
     see_also:
     - https://schema.org/ExhibitionEvent
@@ -324,7 +338,16 @@ classes:
           country: NL
         exhibition_venue: Philips Wing
         exhibition_status: COMPLETED
-        visitor_count: 650000
+        has_or_had_quantity:
+          quantity_value: 650000
+          quantity_type: VISITOR_COUNT
+          has_or_had_measurement_unit:
+            unit_type: VISITOR
+            unit_symbol: "visitors"
+          temporal_extent:
+            begin_of_the_begin: "2023-02-10T00:00:00Z"
+            end_of_the_end: "2023-06-04T23:59:59Z"
+          has_or_had_description: Vermeer exhibition attendance
         exhibition_url: https://www.rijksmuseum.nl/nl/vermeer
         has_or_had_featured_object:
         - https://nde.nl/ontology/hc/object/mauritshuis-girl-pearl-earring

frontend/public/schemas/20251121/linkml/modules/classes/ExternalWork.yaml

@@ -0,0 +1,73 @@
+# ExternalWork - External work/services accepted by an institution
+# Created per slot_fixes.yaml migration for: accepts_or_accepted_external_work
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/classes/ExternalWork
+name: ExternalWork
+title: ExternalWork
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+
+imports:
+  - linkml:types
+
+default_range: string
+
+classes:
+  ExternalWork:
+    description: >-
+      External work or services that an institution accepts or commissions.
+      
+      **EXAMPLES**:
+      - Conservation work from external specialists
+      - Digitization services
+      - Research collaborations
+      - Restoration projects
+      
+      Used with `accepts_or_accepted` slot to indicate what types of
+      external work an institution will accept or commission.
+      
+    class_uri: schema:Service
+    
+    close_mappings:
+      - schema:Offer
+    
+    attributes:
+      work_type:
+        range: string
+        required: true
+        description: >-
+          Type of external work (e.g., "conservation", "digitization", "restoration").
+      
+      description:
+        range: string
+        description: >-
+          Description of the external work type.
+      
+      requirements:
+        range: string
+        multivalued: true
+        description: >-
+          Requirements or qualifications for external work providers.
+    
+    annotations:
+      custodian_types: '["M", "A", "L", "G"]'
+      custodian_types_rationale: >-
+        External work primarily relevant for museums, archives, libraries, galleries.
+      custodian_types_primary: "M"
+      specificity_score: 0.7
+      specificity_rationale: >-
+        High specificity - specific to service acceptance policies.
+    
+    examples:
+      - value: |
+          ExternalWork:
+            work_type: "conservation"
+            description: "Paper and textile conservation services"
+            requirements:
+              - "Certified conservator"
+              - "Portfolio of previous work"
+        description: Conservation work accepted by archive.

frontend/public/schemas/20251121/linkml/modules/classes/GiftShop.yaml

@@ -34,7 +34,10 @@ imports:
 - ../slots/temporal_extent
 - ../slots/valid_from
 - ../slots/valid_to
-- ../slots/visitor_conversion_rate
+- ../slots/has_or_had_conversion_rate
+- ./ConversionRate
+- ./ConversionRateType
+- ./ConversionRateTypes
 - ../slots/was_derived_from
 - ../slots/was_generated_by
 - ./SpecificityAnnotation
@@ -125,7 +128,7 @@ classes:
     - temporal_extent
     - valid_from
     - valid_to
-    - visitor_conversion_rate
+    - has_or_had_conversion_rate
     - was_derived_from
     - was_generated_by
     slot_usage:
@@ -232,12 +235,22 @@ classes:
         examples:
         - value: EUR 5,000,000
           description: Annual revenue in euros
-      visitor_conversion_rate:
+      has_or_had_conversion_rate:
-        range: float
+        range: ConversionRate
+        inlined: true
+        multivalued: true
         required: false
+        description: Conversion rate metrics for the gift shop (visitor-to-purchase, visitor-to-member, etc.)
         examples:
-        - value: 0.35
+        - value: |
-          description: 35% conversion rate
+            has_or_had_conversion_rate:
+              - rate_value: 0.35
+                has_or_had_type:
+                  type_label: "Visitor to Purchase"
+                temporal_extent:
+                  begin_of_the_begin: "2024-01-01"
+                  end_of_the_end: "2024-12-31"
+          description: 35% visitor-to-purchase conversion rate for calendar year
       staff_count:
         range: integer
         required: false

frontend/public/schemas/20251121/linkml/modules/classes/Hypothesis.yaml

@@ -0,0 +1,133 @@
+# Hypothesis - A hypothesis or assertion about uncertain data (e.g., institution type)
+# Created per slot_fixes.yaml migration for: type_hypothesis
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/classes/Hypothesis
+name: Hypothesis
+title: Hypothesis
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  prov: http://www.w3.org/ns/prov#
+  skos: http://www.w3.org/2004/02/skos/core#
+  schema: http://schema.org/
+
+imports:
+  - linkml:types
+
+default_range: string
+
+classes:
+  Hypothesis:
+    description: >-
+      A hypothesis or working assertion about uncertain or ambiguous data.
+      
+      **USE CASE**: Institution Type Hypotheses
+      When an institution's type cannot be definitively determined, multiple
+      type hypotheses can be recorded with supporting/contradicting evidence
+      and confidence levels.
+      
+      **STRUCTURE**:
+      - Asserted value (the hypothesis)
+      - Confidence level
+      - Supporting evidence
+      - Contradicting evidence
+      - Alternative interpretations
+      
+      **ONTOLOGY MAPPING**:
+      - class_uri: skos:Concept (the hypothesis is a conceptual assertion)
+      - Related to prov:Entity (what is being hypothesized about)
+      
+    class_uri: skos:Concept
+    
+    close_mappings:
+      - prov:Entity
+      - schema:Claim
+    
+    related_mappings:
+      - skos:note
+    
+    attributes:
+      asserted_value:
+        range: string
+        required: true
+        description: >-
+          The hypothesized value or assertion.
+          Example: "MUSEUM", "ARCHIVE", "COLLECTING_SOCIETY"
+      
+      confidence_level:
+        range: string
+        description: >-
+          Qualitative confidence level for this hypothesis.
+          Values: "high", "medium", "low", "very_low"
+      
+      confidence_score:
+        range: float
+        minimum_value: 0.0
+        maximum_value: 1.0
+        description: >-
+          Numeric confidence score (0.0 to 1.0) for this hypothesis.
+      
+      supporting_evidence:
+        range: string
+        multivalued: true
+        description: >-
+          Evidence supporting this hypothesis.
+          Example: "Uses term 'exhibitions' in description"
+      
+      contradicting_evidence:
+        range: string
+        multivalued: true
+        description: >-
+          Evidence contradicting this hypothesis.
+          Example: "No physical location mentioned"
+      
+      alternative_interpretation:
+        range: string
+        description: >-
+          Alternative interpretation of the same evidence.
+          Example: "Could also be interpreted as gallery based on art focus"
+      
+      note:
+        range: string
+        slot_uri: skos:note
+        description: >-
+          General notes about this hypothesis.
+    
+    annotations:
+      custodian_types: '["U"]'
+      custodian_types_rationale: >-
+        Hypotheses are primarily used for Unknown (U) type institutions
+        where the type is ambiguous and needs research to resolve.
+      custodian_types_primary: "U"
+      specificity_score: 0.8
+      specificity_rationale: >-
+        High specificity - only relevant for uncertain/ambiguous data.
+    
+    examples:
+      - value: |
+          Hypothesis:
+            asserted_value: "MUSEUM"
+            confidence_level: "medium"
+            confidence_score: 0.65
+            supporting_evidence:
+              - "Website mentions 'exhibitions'"
+              - "Has physical visitor address"
+            contradicting_evidence:
+              - "No collection catalog found"
+            alternative_interpretation: "Could be a gallery with temporary shows"
+        description: >-
+          Type hypothesis suggesting institution is a museum.
+      
+      - value: |
+          Hypothesis:
+            asserted_value: "COLLECTING_SOCIETY"
+            confidence_level: "high"
+            confidence_score: 0.85
+            supporting_evidence:
+              - "Name contains 'Historische Vereniging'"
+              - "Membership-based organization"
+              - "Maintains local archive"
+        description: >-
+          High-confidence hypothesis for a collecting society.

frontend/public/schemas/20251121/linkml/modules/classes/InternetOfThings.yaml

@@ -33,7 +33,8 @@ imports:
 - ../slots/technical_specification
 - ../slots/template_specificity
 - ../slots/temporal_extent
-- ../slots/update_frequency
+- ../slots/has_or_had_frequency
+- ./UpdateFrequency
 - ../slots/was_derived_from
 - ../slots/was_generated_by
 - ./SpecificityAnnotation
@@ -115,7 +116,7 @@ classes:
     - technical_specification
     - template_specificity
     - temporal_extent
-    - update_frequency
+    - has_or_had_frequency
     - was_derived_from
     - was_generated_by
     slot_usage:
@@ -222,12 +223,26 @@ classes:
         examples:
         - value: JSON
           description: JSON data format
-      update_frequency:
+      has_or_had_frequency:
-        range: string
+        range: UpdateFrequency
+        inlined: true
+        description: >-
+          How often the device sends data/updates, represented as a structured
+          UpdateFrequency instance with quantity and time interval components.
         examples:
-        - value: Every 5 minutes
+        - value: |
+            has_or_had_frequency:
+              frequency_description: "Every 5 minutes"
+              has_or_had_quantity:
+                numeric_value: 5
+              has_or_had_time_interval:
+                duration_value: "PT1M"
           description: Climate sensor update frequency
-        - value: On proximity trigger
+        - value: |
+            has_or_had_frequency:
+              frequency_description: "On proximity trigger"
+              is_event_driven: true
+              trigger_type: "proximity"
           description: Beacon trigger frequency
       installed_at_place:
         range: CustodianPlace
@@ -321,7 +336,13 @@ classes:
         publishes_to: https://dashboard.rijksmuseum.nl/climate
         api_endpoint: https://api.rijksmuseum.nl/climate/v1/
         data_format: JSON
-        update_frequency: Every 5 minutes
+        has_or_had_frequency:
+          frequency_description: "Every 5 minutes"
+          has_or_had_quantity:
+            numeric_value: 5
+          has_or_had_time_interval:
+            duration_value: "PT1M"
+            duration_description: "minute"
         installation_date: '2020-01-15'
         operational_status: ACTIVE
         maintenance_schedule: Quarterly calibration

frontend/public/schemas/20251121/linkml/modules/classes/Location.yaml

@@ -0,0 +1,98 @@
+# Location class
+# Generic geographic location representation
+#
+# Generation date: 2026-01-15
+# Rule compliance: 0 (LinkML single source of truth), 38 (slot centralization)
+#
+# Generic location class for use by TransferEvent and other location-referencing entities
+
+id: https://nde.nl/ontology/hc/class/Location
+name: location_class
+title: Location Class
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  locn: http://www.w3.org/ns/locn#
+  wgs84: http://www.w3.org/2003/01/geo/wgs84_pos#
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ../metadata
+  - ../slots/location_name
+  - ../slots/latitude
+  - ../slots/longitude
+  - ../slots/specificity_annotation
+  - ../slots/template_specificity
+  - ./SpecificityAnnotation
+  - ./TemplateSpecificityScores
+
+classes:
+  Location:
+    class_uri: schema:Place
+    description: |
+      Generic geographic location representation.
+      
+      **Purpose**:
+      Location provides a reusable class for representing geographic
+      locations with name and optional coordinates.
+      
+      **Ontological Alignment**:
+      - **Primary**: `schema:Place` - Schema.org Place
+      - **Exact**: `locn:Location` - LOCN (W3C Location) location
+      - **Related**: `wgs84:Point` - WGS84 geo point (for coordinates)
+      
+      **Use Cases**:
+      - Transfer event locations (origin/destination)
+      - Institution physical locations
+      - Collection storage locations
+      
+    exact_mappings:
+      - locn:Location
+    
+    related_mappings:
+      - wgs84:Point
+    
+    slots:
+      - location_name
+      - latitude
+      - longitude
+      - specificity_annotation
+      - template_specificity
+    
+    slot_usage:
+      location_name:
+        description: |
+          Human-readable name of the location.
+        range: string
+        required: true
+      latitude:
+        description: |
+          WGS84 latitude coordinate.
+        range: float
+        required: false
+      longitude:
+        description: |
+          WGS84 longitude coordinate.
+        range: float
+        required: false
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: Locations apply to all heritage custodian types.
+      custodian_types_primary: null
+      specificity_score: 0.2
+      specificity_rationale: Generic location class applicable across all contexts.
+    
+    examples:
+      - value: |
+          location_name: "Rijksmuseum Amsterdam"
+          latitude: 52.3600
+          longitude: 4.8852
+        description: "Location with coordinates"
+      - value: |
+          location_name: "Noord-Hollands Archief, Haarlem"
+        description: "Location with name only"

frontend/public/schemas/20251121/linkml/modules/classes/Methodology.yaml

@@ -0,0 +1,212 @@
+id: https://nde.nl/ontology/hc/class/Methodology
+name: methodology_class
+title: Methodology Class
+description: >-
+  Defines the methodology or technique used to derive a measurement or observation.
+  
+  **RULE 53 COMPLIANT**: Created for unique_object_count and unique_face_count
+  migration per slot_fixes.yaml revision (lines 1951-1994).
+  
+  **PROV-O ALIGNMENT**:
+  
+  Maps to `prov:Plan` - "A plan is an entity that represents a set of actions or
+  steps intended by one or more agents to achieve some goals."
+  
+  In the PROV-O data model, a Plan describes HOW an activity was performed.
+  Methodology extends this to describe HOW a measurement was derived.
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  prov: http://www.w3.org/ns/prov#
+  schema: http://schema.org/
+  dcterms: http://purl.org/dc/terms/
+
+imports:
+  - linkml:types
+  - ../slots/has_or_had_identifier
+  - ../slots/has_or_had_label
+  - ../slots/has_or_had_description
+  - ../slots/specificity_annotation
+  - ../slots/template_specificity
+  - ./SpecificityAnnotation
+  - ./TemplateSpecificityScores
+  - ../enums/MethodologyTypeEnum
+
+default_prefix: hc
+
+classes:
+  Methodology:
+    class_uri: prov:Plan
+    description: >-
+      Describes the methodology, technique, or algorithm used to derive a measurement.
+      
+      **PROV-O ALIGNMENT**:
+      
+      Maps to `prov:Plan` which represents "a set of actions or steps intended by
+      one or more agents to achieve some goals." In measurement contexts, this
+      describes HOW a value was computed or derived.
+      
+      **WHY METHODOLOGY MATTERS**:
+      
+      Two measurements of "unique objects" could use different methodologies:
+      
+      | Methodology | Description | Accuracy |
+      |-------------|-------------|----------|
+      | ENTITY_RESOLUTION | Deduplication via feature matching | High |
+      | TRACKING | Object tracking across frames | Medium |
+      | MANUAL_COUNT | Human counting | Variable |
+      | SAMPLING | Statistical sampling | Estimated |
+      
+      Without methodology, two measurements cannot be meaningfully compared.
+      
+      **HERITAGE USE CASES**:
+      
+      - **Video annotation**: How unique faces/objects were counted (entity resolution)
+      - **Collection inventories**: How item counts were derived (physical vs. digital)
+      - **Visitor statistics**: How attendance was measured (counters, tickets, samples)
+      - **Digitization metrics**: How completeness was assessed
+      
+      **EXAMPLE**:
+      
+      ```yaml
+      has_or_had_methodology:
+        methodology_type: ENTITY_RESOLUTION
+        has_or_had_label: "RetinaFace + ArcFace clustering"
+        has_or_had_description: >-
+          Faces detected using RetinaFace model, then clustered
+          using ArcFace embeddings with cosine similarity threshold 0.6
+          to identify unique individuals.
+      ```
+      
+    exact_mappings:
+      - prov:Plan
+    close_mappings:
+      - schema:HowToStep
+    related_mappings:
+      - dcterms:methodology
+    slots:
+      - has_or_had_identifier
+      - methodology_type
+      - has_or_had_label
+      - has_or_had_description
+      - algorithm_name
+      - algorithm_version
+      - confidence_threshold
+      - specificity_annotation
+      - template_specificity
+    slot_usage:
+      has_or_had_identifier:
+        range: uriorcurie
+        required: false
+        identifier: true
+        description: >-
+          Optional identifier for this methodology specification.
+        examples:
+          - value: https://nde.nl/ontology/hc/methodology/retinaface-arcface-v1
+            description: Face clustering methodology identifier
+      methodology_type:
+        range: MethodologyTypeEnum
+        required: false
+        description: >-
+          The type of methodology used.
+        examples:
+          - value: ENTITY_RESOLUTION
+            description: Deduplication via feature matching
+          - value: OBJECT_TRACKING
+            description: Multi-object tracking across frames
+      has_or_had_label:
+        range: string
+        required: false
+        description: >-
+          Human-readable name for the methodology.
+        examples:
+          - value: "RetinaFace + ArcFace clustering"
+            description: Face detection and clustering pipeline
+      has_or_had_description:
+        range: string
+        required: false
+        description: >-
+          Detailed description of the methodology.
+        examples:
+          - value: "Faces detected using RetinaFace, clustered using ArcFace embeddings"
+            description: Algorithm description
+      algorithm_name:
+        range: string
+        required: false
+        description: >-
+          Name of the algorithm or model used.
+        examples:
+          - value: "YOLOv8"
+            description: Object detection model
+          - value: "ArcFace"
+            description: Face recognition model
+      algorithm_version:
+        range: string
+        required: false
+        description: >-
+          Version of the algorithm or model.
+        examples:
+          - value: "1.0.0"
+          - value: "v8n"
+      confidence_threshold:
+        range: float
+        required: false
+        minimum_value: 0.0
+        maximum_value: 1.0
+        description: >-
+          Confidence threshold used for detection/classification.
+        examples:
+          - value: 0.6
+            description: 60% confidence threshold for face matching
+    comments:
+      - Describes HOW a measurement was derived
+      - Essential for comparing measurements from different sources
+      - Maps to PROV-O Plan for provenance tracking
+      - Rule 53 compliant - supports unique_object_count/unique_face_count migration
+    see_also:
+      - https://www.w3.org/TR/prov-o/#Plan
+    examples:
+      - value:
+          methodology_type: ENTITY_RESOLUTION
+          has_or_had_label: "RetinaFace + ArcFace clustering"
+          has_or_had_description: >-
+            Faces detected using RetinaFace model, then clustered
+            using ArcFace embeddings with cosine similarity threshold 0.6.
+          algorithm_name: "ArcFace"
+          confidence_threshold: 0.6
+        description: Face entity resolution methodology
+      - value:
+          methodology_type: OBJECT_TRACKING
+          has_or_had_label: "DeepSORT multi-object tracking"
+          has_or_had_description: >-
+            Objects tracked across video frames using DeepSORT algorithm
+            with Kalman filtering and appearance features.
+          algorithm_name: "DeepSORT"
+          algorithm_version: "1.0"
+        description: Object tracking methodology
+
+slots:
+  methodology_type:
+    description: >-
+      The type of methodology used for measurement derivation.
+    range: MethodologyTypeEnum
+    slot_uri: hc:methodologyType
+  
+  algorithm_name:
+    description: >-
+      Name of the algorithm, model, or technique used.
+    range: string
+    slot_uri: hc:algorithmName
+  
+  algorithm_version:
+    description: >-
+      Version identifier for the algorithm or model.
+    range: string
+    slot_uri: hc:algorithmVersion
+  
+  confidence_threshold:
+    description: >-
+      Confidence threshold used for detection, matching, or classification.
+    range: float
+    slot_uri: hc:confidenceThreshold

frontend/public/schemas/20251121/linkml/modules/classes/MuseumRegisterEnrichment.yaml

@@ -15,8 +15,8 @@ prefixes:
 
 imports:
   - linkml:types
-
+  - ../slots/has_or_had_quantity
-
+  - ./Quantity
   - ./MuseumRegisterProvenance
 default_range: string
 
@@ -75,8 +75,13 @@ classes:
           range: string
           multivalued: true
           inlined_as_list: true
-        visitor_count:
+        has_or_had_quantity:
-          range: integer
+          range: Quantity
+          inlined: true
+          description: >-
+            Visitor count from museum register. RULE 53: Replaces deprecated
+            visitor_count integer with structured Quantity class supporting
+            measurement unit (VISITOR) and temporal extent.
         accreditation_status:
           range: string
         manual_correction:

frontend/public/schemas/20251121/linkml/modules/classes/PaymentMethod.yaml

@@ -0,0 +1,73 @@
+# PaymentMethod - Payment methods accepted by an institution
+# Created per slot_fixes.yaml migration for: accepts_or_accepted_payment_method
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/classes/PaymentMethod
+name: PaymentMethod
+title: PaymentMethod
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+
+imports:
+  - linkml:types
+
+default_range: string
+
+classes:
+  PaymentMethod:
+    description: >-
+      A payment method accepted by an institution for tickets, services, or purchases.
+      
+      **EXAMPLES**:
+      - Credit cards (Visa, Mastercard, Amex)
+      - Debit cards (Maestro, V-Pay)
+      - Digital payments (iDEAL, Apple Pay, Google Pay)
+      - Cash
+      - Museum passes (Museumkaart, etc.)
+      
+      Used with `accepts_or_accepted` slot to indicate payment options.
+      
+    class_uri: schema:PaymentMethod
+    
+    attributes:
+      method_type:
+        range: string
+        required: true
+        description: >-
+          Type of payment method (e.g., "credit_card", "debit_card", "digital", "cash").
+      
+      provider:
+        range: string
+        description: >-
+          Payment provider or brand (e.g., "Visa", "iDEAL", "Apple Pay").
+      
+      note:
+        range: string
+        description: >-
+          Additional notes about this payment method.
+    
+    annotations:
+      custodian_types: '["M", "G", "B", "H"]'
+      custodian_types_rationale: >-
+        Payment methods primarily relevant for visitor-facing institutions.
+      custodian_types_primary: "M"
+      specificity_score: 0.6
+      specificity_rationale: >-
+        Moderate-high specificity - specific to ticketing/commerce.
+    
+    examples:
+      - value: |
+          PaymentMethod:
+            method_type: "credit_card"
+            provider: "Visa"
+        description: Visa credit card payment.
+      
+      - value: |
+          PaymentMethod:
+            method_type: "digital"
+            provider: "iDEAL"
+            note: "Dutch bank transfer system"
+        description: iDEAL digital payment method.

frontend/public/schemas/20251121/linkml/modules/classes/Place.yaml

@@ -0,0 +1,107 @@
+# Place - A geographic or administrative place for containment relationships
+# Created per slot_fixes.yaml migration for: within_place, within_auxiliary_place
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/classes/Place
+name: Place
+title: Place
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  gn: http://www.geonames.org/ontology#
+  locn: http://www.w3.org/ns/locn#
+
+imports:
+  - linkml:types
+
+default_range: string
+
+classes:
+  Place:
+    description: >-
+      A geographic or administrative place used for containment relationships.
+      
+      **DISTINCTION FROM Location**:
+      - `Location` is for precise physical locations (address, coordinates)
+      - `Place` is for administrative/geographic containment (city within province)
+      
+      **USE CASES**:
+      - `within_place`: Institution is within a city/region
+      - `within_auxiliary_place`: Secondary location containment
+      - Administrative hierarchies: settlement → region → country
+      
+      **ONTOLOGY MAPPING**:
+      - class_uri: schema:Place (generic place concept)
+      - Supports GeoNames integration for standardized place references
+      
+    class_uri: schema:Place
+    
+    close_mappings:
+      - gn:Feature
+      - locn:Location
+    
+    related_mappings:
+      - schema:AdministrativeArea
+    
+    attributes:
+      place_name:
+        range: string
+        required: true
+        description: >-
+          Name of the place (e.g., "Amsterdam", "Noord-Holland", "Netherlands").
+      
+      place_type:
+        range: string
+        description: >-
+          Type of place (e.g., "settlement", "region", "country", "district").
+      
+      geonames_id:
+        range: integer
+        description: >-
+          GeoNames identifier for standardized place reference.
+          Example: 2759794 for Amsterdam.
+      
+      iso_code:
+        range: string
+        description: >-
+          ISO code for administrative areas.
+          Examples: "NL" (country), "NL-NH" (region), "AMS" (settlement code).
+      
+      parent_place:
+        range: Place
+        inlined: true
+        description: >-
+          Parent place in the administrative hierarchy.
+          Example: Amsterdam's parent is Noord-Holland.
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: >-
+        Place references applicable to all custodian types.
+      custodian_types_primary: "*"
+      specificity_score: 0.2
+      specificity_rationale: >-
+        Low specificity - universal geographic concept.
+    
+    examples:
+      - value: |
+          Place:
+            place_name: "Amsterdam"
+            place_type: "settlement"
+            geonames_id: 2759794
+            iso_code: "AMS"
+            parent_place:
+              place_name: "Noord-Holland"
+              place_type: "region"
+              iso_code: "NL-NH"
+        description: Amsterdam as a settlement within Noord-Holland.
+      
+      - value: |
+          Place:
+            place_name: "Netherlands"
+            place_type: "country"
+            iso_code: "NL"
+            geonames_id: 2750405
+        description: Country-level place reference.

frontend/public/schemas/20251121/linkml/modules/classes/Provenance.yaml

@@ -0,0 +1,118 @@
+# Provenance - A single provenance statement tracking the origin and lineage of data
+# Distinct from ProvenanceBlock which bundles multiple provenance sources
+# Created per slot_fixes.yaml migration for: binding_provenance, xpath, type_hypothesis
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/classes/Provenance
+name: Provenance
+title: Provenance
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  prov: http://www.w3.org/ns/prov#
+  dct: http://purl.org/dc/terms/
+  schema: http://schema.org/
+  xsd: http://www.w3.org/2001/XMLSchema#
+
+imports:
+  - linkml:types
+  - ../slots/has_or_had_agent
+  - ../slots/temporal_extent
+
+default_range: string
+
+classes:
+  Provenance:
+    description: >-
+      A single provenance statement describing the origin, lineage, or derivation
+      of a piece of data.
+      
+      **DISTINCTION FROM ProvenanceBlock**:
+      - `Provenance` represents a SINGLE provenance statement (one source, one activity)
+      - `ProvenanceBlock` bundles MULTIPLE provenance sources together
+      
+      Use `Provenance` when:
+      - Tracking provenance of individual data elements
+      - Recording specific extraction or transformation activities
+      - Linking data to its source agent/entity
+      
+      **ONTOLOGY MAPPING**:
+      - class_uri: prov:Activity (the extraction/derivation activity)
+      - Links to prov:Agent via has_or_had_agent
+      - Links to prov:Entity via used (source) and generated (result)
+      
+    class_uri: prov:Activity
+    
+    close_mappings:
+      - dct:ProvenanceStatement
+      - schema:Action
+    
+    related_mappings:
+      - prov:Entity
+      - prov:Derivation
+    
+    slots:
+      - has_or_had_agent
+      - temporal_extent
+    
+    attributes:
+      source_entity:
+        range: uriorcurie
+        description: >-
+          URI of the source entity from which data was derived (prov:used).
+        slot_uri: prov:used
+      
+      generated_entity:
+        range: uriorcurie
+        description: >-
+          URI of the entity generated by this provenance activity (prov:generated).
+        slot_uri: prov:generated
+      
+      extraction_method:
+        range: string
+        description: >-
+          Method or process used to extract/derive the data.
+          Examples: "xpath_extraction", "api_query", "manual_entry"
+      
+      confidence_score:
+        range: float
+        minimum_value: 0.0
+        maximum_value: 1.0
+        description: >-
+          Confidence score (0.0 to 1.0) indicating reliability of this provenance.
+      
+      note:
+        range: string
+        description: >-
+          Human-readable note about this provenance statement.
+        slot_uri: prov:value
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: >-
+        Provenance tracking is universal across all custodian types.
+      custodian_types_primary: "*"
+      specificity_score: 0.15
+      specificity_rationale: >-
+        Very low specificity - provenance metadata applies universally.
+    
+    examples:
+      - value: |
+          Provenance:
+            extraction_method: "xpath_extraction"
+            source_entity: "https://example.org/webpage/12345"
+            confidence_score: 0.95
+            note: "Extracted from archived HTML using XPath"
+        description: >-
+          Provenance for an XPath-extracted value from an archived webpage.
+      
+      - value: |
+          Provenance:
+            has_or_had_agent:
+              agent_type: "software"
+              name: "glam-extractor-v2.1"
+            extraction_method: "api_scraping"
+            confidence_score: 0.85
+        description: >-
+          Provenance for API-scraped data with agent identification.

frontend/public/schemas/20251121/linkml/modules/classes/Quantity.yaml

@@ -13,8 +13,14 @@ imports:
 - ../slots/has_or_had_identifier
 - ../slots/has_or_had_label
 - ../slots/has_or_had_description
+- ../slots/has_or_had_measurement_unit
+- ../slots/has_or_had_methodology
+- ../slots/temporal_extent
 - ../slots/specificity_annotation
 - ../slots/template_specificity
+- ./MeasureUnit
+- ./Methodology
+- ./TimeSpan
 - ./SpecificityAnnotation
 - ./TemplateSpecificityScores
 default_prefix: hc
@@ -65,10 +71,18 @@ classes:
         quantity_id: https://nde.nl/ontology/hc/quantity/nha-zaanstreek-staff-2025
         quantity_value: 3
         quantity_type: STAFF_COUNT
-        quantity_unit: FTE
+        has_or_had_measurement_unit:
-        quantity_description: Staff assigned to Zaanstreek-Waterland branch
+          unit_type: VISITOR
-        quantity_date: 2025-01-01
+          unit_symbol: "visitors"
+        temporal_extent:
+          begin_of_the_begin: "2024-01-01T00:00:00Z"
+          end_of_the_end: "2024-12-31T23:59:59Z"
+        has_or_had_description: Staff assigned to Zaanstreek-Waterland branch
       ```
+      
+      **RULE 53 COMPLIANT**: Updated with link_branch slots (has_or_had_measurement_unit,
+      temporal_extent, has_or_had_methodology) per slot_fixes.yaml revision for 
+      visitor_count, view_count, unique_object_count, and unique_face_count migrations.
     exact_mappings:
       - qudt:Quantity
     close_mappings:
@@ -82,6 +96,9 @@ classes:
       - quantity_value
       - quantity_type
       - quantity_unit
+      - has_or_had_measurement_unit
+      - has_or_had_methodology
+      - temporal_extent
       - has_or_had_description
       - quantity_date
       - is_estimate
@@ -121,8 +138,12 @@ classes:
       quantity_unit:
         range: string
         required: false
+        deprecated: >-
+          Use has_or_had_measurement_unit with MeasureUnit class instead.
+          Retained for backward compatibility with existing data.
         description: >-
-          The unit of measurement (if applicable).
+          DEPRECATED: The unit of measurement as a simple string.
+          Prefer has_or_had_measurement_unit for structured unit data.
         examples:
           - value: FTE
             description: Full-time equivalent employees
@@ -136,6 +157,54 @@ classes:
             description: Budget in euros
           - value: m²
             description: Floor area
+      has_or_had_measurement_unit:
+        range: MeasureUnit
+        required: false
+        inlined: true
+        description: >-
+          The structured unit of measurement for this quantity.
+          Provides richer semantics than the deprecated quantity_unit string.
+          RULE 53: Branch 1 slot from visitor_count migration.
+        examples:
+          - value:
+              unit_type: VISITOR
+              unit_symbol: "visitors"
+            description: Visitor count unit
+          - value:
+              unit_type: SQUARE_METER
+              unit_symbol: "m²"
+            description: Area unit
+      temporal_extent:
+        range: TimeSpan
+        required: false
+        inlined: true
+        description: >-
+          The time period over which this quantity was measured.
+          CIDOC-CRM temporal modeling with fuzzy boundaries.
+          RULE 53: Branch 2 slot from visitor_count migration.
+        examples:
+          - value:
+              begin_of_the_begin: "2024-01-01T00:00:00Z"
+              end_of_the_end: "2024-12-31T23:59:59Z"
+            description: Annual measurement period
+      has_or_had_methodology:
+        range: Methodology
+        required: false
+        inlined: true
+        description: >-
+          The methodology used to derive this quantity.
+          Essential for unique counts derived via entity resolution.
+          RULE 53: Branch 2 slot from unique_object_count/unique_face_count migration.
+        examples:
+          - value:
+              methodology_type: ENTITY_RESOLUTION
+              has_or_had_label: "ArcFace clustering"
+              confidence_threshold: 0.6
+            description: Face entity resolution methodology
+          - value:
+              methodology_type: OBJECT_TRACKING
+              has_or_had_label: "DeepSORT"
+            description: Multi-object tracking methodology
       has_or_had_description:
         range: string
         required: false
@@ -175,18 +244,58 @@ classes:
           has_or_had_identifier: https://nde.nl/ontology/hc/quantity/nha-zaanstreek-staff-2025
           quantity_value: 3
           quantity_type: STAFF_COUNT
-          quantity_unit: FTE
+          has_or_had_measurement_unit:
+            unit_type: FTE
+            unit_symbol: "FTE"
+            has_or_had_label: "full-time equivalent"
           has_or_had_description: Staff assigned to Zaanstreek-Waterland branch
           quantity_date: '2025-01-01'
           is_estimate: false
-        description: Branch staff count
+        description: Branch staff count (preferred pattern with structured unit)
+      - value:
+          quantity_value: 650000
+          quantity_type: VISITOR_COUNT
+          has_or_had_measurement_unit:
+            unit_type: VISITOR
+            unit_symbol: "visitors"
+          temporal_extent:
+            begin_of_the_begin: "2023-02-10T00:00:00Z"
+            end_of_the_end: "2023-06-04T23:59:59Z"
+          has_or_had_description: Vermeer exhibition attendance
+          is_estimate: false
+        description: Exhibition visitor count with temporal extent (Rule 53 pattern)
+      - value:
+          quantity_value: 15
+          quantity_type: OBJECT_COUNT
+          has_or_had_measurement_unit:
+            unit_type: FACE
+            unit_symbol: "faces"
+          has_or_had_methodology:
+            methodology_type: ENTITY_RESOLUTION
+            has_or_had_label: "ArcFace clustering"
+            confidence_threshold: 0.6
+          has_or_had_description: Unique faces detected via entity resolution
+          is_estimate: false
+        description: Unique face count with methodology (Rule 53 pattern for unique_face_count)
+      - value:
+          quantity_value: 47
+          quantity_type: OBJECT_COUNT
+          has_or_had_measurement_unit:
+            unit_type: OBJECT
+            unit_symbol: "objects"
+          has_or_had_methodology:
+            methodology_type: OBJECT_TRACKING
+            has_or_had_label: "DeepSORT"
+          has_or_had_description: Unique objects tracked across video frames
+          is_estimate: false
+        description: Unique object count with methodology (Rule 53 pattern for unique_object_count)
       - value:
           quantity_value: 1200000
           quantity_type: COLLECTION_SIZE
           quantity_unit: items
           has_or_had_description: Total collection size including artworks, documents, and photographs
           is_estimate: true
-        description: Estimated collection size
+        description: Estimated collection size (deprecated string unit - backward compatible)
       - value:
           quantity_value: 2500000
           quantity_type: VISITOR_COUNT
@@ -194,7 +303,7 @@ classes:
           has_or_had_description: Annual visitor count for 2024
           quantity_date: '2024-12-31'
           is_estimate: false
-        description: Annual visitor count
+        description: Annual visitor count (deprecated string unit - backward compatible)
 slots:
   quantity_value:
     description: >-

frontend/public/schemas/20251121/linkml/modules/classes/Scope.yaml

@@ -0,0 +1,89 @@
+# Scope - Coverage/scope information for collections, services, or institutions
+# Created per slot_fixes.yaml migration for: typical_scope, type_scope
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/classes/Scope
+name: Scope
+title: Scope
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  dct: http://purl.org/dc/terms/
+  schema: http://schema.org/
+
+imports:
+  - linkml:types
+  - ../slots/has_or_had_type
+
+default_range: string
+
+classes:
+  Scope:
+    description: >-
+      Coverage or scope information for a collection, service, or institution.
+      
+      **SCOPE DIMENSIONS**:
+      - **Temporal**: Time period covered (e.g., "1600-1900")
+      - **Spatial**: Geographic coverage (e.g., "Netherlands", "Amsterdam")
+      - **Subject**: Topic/subject areas (e.g., "Dutch Golden Age painting")
+      - **Material**: Types of materials (e.g., "photographs", "manuscripts")
+      
+      **ONTOLOGY MAPPING**:
+      - class_uri: dct:Coverage (Dublin Core coverage concept)
+      
+    class_uri: dct:Coverage
+    
+    close_mappings:
+      - schema:Thing
+    
+    slots:
+      - has_or_had_type
+    
+    attributes:
+      scope_description:
+        range: string
+        description: >-
+          Human-readable description of the scope.
+      
+      temporal_coverage:
+        range: string
+        description: >-
+          Time period covered (e.g., "1600-1900", "Medieval period").
+      
+      spatial_coverage:
+        range: string
+        description: >-
+          Geographic coverage (e.g., "Netherlands", "Europe").
+      
+      subject_coverage:
+        range: string
+        multivalued: true
+        description: >-
+          Subject areas covered.
+      
+      material_coverage:
+        range: string
+        multivalued: true
+        description: >-
+          Types of materials covered.
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: >-
+        Scope information applicable to all custodian types.
+      custodian_types_primary: "*"
+      specificity_score: 0.3
+      specificity_rationale: >-
+        Low-moderate specificity - common metadata concept.
+    
+    examples:
+      - value: |
+          Scope:
+            scope_description: "Dutch art from the Golden Age"
+            temporal_coverage: "1600-1700"
+            spatial_coverage: "Netherlands"
+            subject_coverage:
+              - "Painting"
+              - "Dutch Golden Age"
+        description: Scope for a Dutch Golden Age art collection.

frontend/public/schemas/20251121/linkml/modules/classes/ScopeType.yaml

@@ -0,0 +1,165 @@
+# ScopeType - Abstract base class for scope type classifications
+#
+# Following the Type/Types naming convention (Rule 0b):
+# - ScopeType.yaml: Abstract base class defining the type taxonomy
+# - ScopeTypes.yaml: File containing all concrete subclasses
+#
+# Created per slot_fixes.yaml migration for: typical_scope, type_scope
+# Creation date: 2026-01-14
+# Rule compliance: 0b (Type/Types naming), 37 (specificity scores), 50 (ontology mapping)
+
+id: https://nde.nl/ontology/hc/class/ScopeType
+name: ScopeType
+title: Scope Type Classification
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  skos: http://www.w3.org/2004/02/skos/core#
+  dct: http://purl.org/dc/terms/
+  schema: http://schema.org/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ../slots/type_description
+  - ../slots/type_id
+  - ../slots/type_label
+  - ../slots/wikidata_entity
+  - ../slots/specificity_annotation
+  - ../slots/template_specificity
+  - ./SpecificityAnnotation
+  - ./TemplateSpecificityScores
+
+classes:
+  ScopeType:
+    class_uri: skos:Concept
+    description: |
+      Abstract base class for scope type classifications in the heritage domain.
+      
+      **DEFINITION**:
+      
+      ScopeType represents CATEGORIES of scope/coverage dimensions, not individual
+      scope instances. Each subclass defines characteristics of a scope category
+      (temporal, spatial, subject, material, etc.).
+      
+      **CRITICAL: TYPE vs INSTANCE**
+      
+      | Aspect | ScopeType (This Class) | Scope (Instance Class) |
+      |--------|------------------------|------------------------|
+      | **Nature** | Classification/category | Individual scope |
+      | **Examples** | TEMPORAL, SPATIAL, SUBJECT | "1600-1700 Dutch painting" |
+      | **Properties** | Category metadata | Actual coverage values |
+      | **Cardinality** | ~5-10 types | Thousands of instances |
+      
+      **SCOPE DIMENSIONS**:
+      
+      1. **TEMPORAL**: Time-based coverage
+         - Century, Decade, Date Range, Era, Period
+         - Historical Period, Epoch
+         
+      2. **SPATIAL**: Geographic coverage
+         - Country, Region, City, Continent
+         - Administrative Division, Geographic Feature
+         
+      3. **SUBJECT**: Topic/domain coverage
+         - Art Movement, Historical Theme, Scientific Domain
+         - Cultural Topic, Social Issue
+         
+      4. **MATERIAL**: Material type coverage
+         - Photographs, Manuscripts, Prints, Maps
+         - Audio Recordings, Video, 3D Objects
+         
+      5. **LINGUISTIC**: Language coverage
+         - Script, Language Family, Dialect Region
+         
+      6. **INSTITUTIONAL**: Organizational coverage
+         - Sector, Industry, Government Level
+         - International, National, Regional, Local
+      
+      **ONTOLOGY ALIGNMENT**:
+      
+      - **SKOS Concept**: Scope types are concepts in a controlled vocabulary
+      - **Dublin Core Coverage**: dct:Coverage for scope semantics
+      - **MODS Subject**: Library of Congress subject coverage model
+      
+      **SUBCLASSES**:
+      
+      See ScopeTypes.yaml for concrete scope type subclasses organized
+      by dimension: TEMPORAL, SPATIAL, SUBJECT, MATERIAL, LINGUISTIC, and
+      INSTITUTIONAL.
+      
+    abstract: true
+    
+    exact_mappings:
+      - skos:Concept
+    
+    close_mappings:
+      - dct:Coverage
+      - schema:DefinedTerm
+    
+    slots:
+      - specificity_annotation
+      - template_specificity
+      - type_description
+      - type_id
+      - type_label
+      - wikidata_entity
+    
+    slot_usage:
+      type_id:
+        range: uriorcurie
+        required: true
+        identifier: true
+        pattern: "^https://nde\\.nl/ontology/hc/scope-type/[a-z-]+$"
+        examples:
+          - value: https://nde.nl/ontology/hc/scope-type/temporal
+            description: Temporal scope type
+          - value: https://nde.nl/ontology/hc/scope-type/spatial
+            description: Spatial scope type
+      
+      type_label:
+        range: string
+        required: true
+        multivalued: true
+        examples:
+          - value: ["Temporal@en", "temporeel@nl", "zeitlich@de"]
+            description: Multilingual labels for temporal scope type
+      
+      type_description:
+        range: string
+        required: false
+        examples:
+          - value: "Time-based scope dimension covering date ranges and historical periods"
+            description: Description of temporal scope type
+      
+      wikidata_entity:
+        range: string
+        required: false
+        pattern: "^Q[0-9]+$"
+    
+    annotations:
+      specificity_score: "0.35"
+      specificity_rationale: "Moderately low specificity - scope types are generic classification concepts."
+      template_specificity: '{"collection_discovery": 0.50, "archive_search": 0.45, "general_heritage": 0.35}'
+    
+    comments:
+      - "Abstract base class - use specific subclasses (TemporalScope, SpatialScope, etc.)"
+      - "Represents SCOPE TYPES, not scope instances"
+      - "Scope.has_or_had_type references these type classes"
+      - "Follows Type/Types naming convention (Rule 0b)"
+      - "Organized by dimension: temporal, spatial, subject, material"
+    
+    see_also:
+      - https://www.dublincore.org/specifications/dublin-core/dcmi-terms/#section-7
+      - https://www.w3.org/2004/02/skos/
+    
+    examples:
+      - value:
+          type_id: https://nde.nl/ontology/hc/scope-type/temporal
+          type_label:
+            - Temporal@en
+            - temporeel@nl
+          type_description: "Time-based scope dimension"
+        description: "Temporal scope type with multilingual labels"

frontend/public/schemas/20251121/linkml/modules/classes/ScopeTypes.yaml

@@ -0,0 +1,262 @@
+# ScopeTypes - Concrete scope type subclasses
+#
+# Following the Type/Types naming convention (Rule 0b):
+# - ScopeType.yaml: Abstract base class defining the type taxonomy
+# - ScopeTypes.yaml: File containing all concrete subclasses
+#
+# Created per slot_fixes.yaml migration for: typical_scope, type_scope
+# Creation date: 2026-01-14
+# Rule compliance: 0b (Type/Types naming), 37 (specificity scores), 50 (ontology mapping)
+
+id: https://nde.nl/ontology/hc/class/ScopeTypes
+name: ScopeTypes
+title: Scope Type Subclasses
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  skos: http://www.w3.org/2004/02/skos/core#
+  dct: http://purl.org/dc/terms/
+  schema: http://schema.org/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ./ScopeType
+
+classes:
+  # =============================================================================
+  # TEMPORAL SCOPE TYPES
+  # =============================================================================
+  
+  TemporalScope:
+    is_a: ScopeType
+    class_uri: dct:PeriodOfTime
+    description: |
+      Time-based scope dimension covering date ranges, historical periods, and eras.
+      
+      **Examples**:
+      - "1600-1700" (date range)
+      - "Medieval period" (historical period)
+      - "19th century" (century scope)
+    
+    exact_mappings:
+      - dct:PeriodOfTime
+    
+    annotations:
+      specificity_score: "0.40"
+      specificity_rationale: "Moderately specific - temporal scoping is common across domains."
+    
+    examples:
+      - value:
+          type_id: https://nde.nl/ontology/hc/scope-type/temporal
+          type_label: ["Temporal@en", "temporeel@nl"]
+        description: Temporal scope type instance
+
+  # =============================================================================
+  # SPATIAL SCOPE TYPES
+  # =============================================================================
+  
+  SpatialScope:
+    is_a: ScopeType
+    class_uri: dct:Location
+    description: |
+      Geographic scope dimension covering countries, regions, cities, and areas.
+      
+      **Examples**:
+      - "Netherlands" (country)
+      - "Noord-Holland" (region/province)
+      - "Amsterdam" (city)
+      - "Europe" (continent)
+    
+    exact_mappings:
+      - dct:Location
+    
+    close_mappings:
+      - schema:Place
+    
+    annotations:
+      specificity_score: "0.40"
+      specificity_rationale: "Moderately specific - geographic scoping is common across domains."
+    
+    examples:
+      - value:
+          type_id: https://nde.nl/ontology/hc/scope-type/spatial
+          type_label: ["Spatial@en", "ruimtelijk@nl"]
+        description: Spatial scope type instance
+
+  # =============================================================================
+  # SUBJECT SCOPE TYPES
+  # =============================================================================
+  
+  SubjectScope:
+    is_a: ScopeType
+    class_uri: dct:subject
+    description: |
+      Topic/domain scope dimension covering subjects, themes, and disciplines.
+      
+      **Examples**:
+      - "Dutch Golden Age painting" (art historical subject)
+      - "World War II" (historical theme)
+      - "Maritime history" (subject area)
+    
+    exact_mappings:
+      - dct:subject
+    
+    close_mappings:
+      - skos:Concept
+    
+    annotations:
+      specificity_score: "0.45"
+      specificity_rationale: "Moderately specific - subject classification is domain-dependent."
+    
+    examples:
+      - value:
+          type_id: https://nde.nl/ontology/hc/scope-type/subject
+          type_label: ["Subject@en", "onderwerp@nl"]
+        description: Subject scope type instance
+
+  # =============================================================================
+  # MATERIAL SCOPE TYPES
+  # =============================================================================
+  
+  MaterialScope:
+    is_a: ScopeType
+    class_uri: dct:DCMIType
+    description: |
+      Material type scope dimension covering media types and object categories.
+      
+      **Examples**:
+      - "Photographs" (visual material)
+      - "Manuscripts" (documentary material)
+      - "Audio recordings" (sound material)
+      - "3D objects" (physical objects)
+    
+    exact_mappings:
+      - dct:DCMIType
+    
+    close_mappings:
+      - schema:CreativeWork
+    
+    annotations:
+      specificity_score: "0.50"
+      specificity_rationale: "More specific - material types are heritage-domain focused."
+    
+    examples:
+      - value:
+          type_id: https://nde.nl/ontology/hc/scope-type/material
+          type_label: ["Material@en", "materiaal@nl"]
+        description: Material scope type instance
+
+  # =============================================================================
+  # LINGUISTIC SCOPE TYPES
+  # =============================================================================
+  
+  LinguisticScope:
+    is_a: ScopeType
+    class_uri: dct:language
+    description: |
+      Language scope dimension covering languages, scripts, and dialects.
+      
+      **Examples**:
+      - "Dutch" (language)
+      - "Arabic script" (writing system)
+      - "Low Saxon" (dialect/regional language)
+    
+    exact_mappings:
+      - dct:language
+    
+    annotations:
+      specificity_score: "0.40"
+      specificity_rationale: "Moderately specific - linguistic scoping is common."
+    
+    examples:
+      - value:
+          type_id: https://nde.nl/ontology/hc/scope-type/linguistic
+          type_label: ["Linguistic@en", "taalkundig@nl"]
+        description: Linguistic scope type instance
+
+  # =============================================================================
+  # INSTITUTIONAL SCOPE TYPES
+  # =============================================================================
+  
+  InstitutionalScope:
+    is_a: ScopeType
+    class_uri: schema:Organization
+    description: |
+      Organizational/sectoral scope dimension covering sectors and governance levels.
+      
+      **Examples**:
+      - "Cultural heritage sector" (sector)
+      - "National level" (governance level)
+      - "Academic institutions" (institutional type)
+    
+    close_mappings:
+      - schema:Organization
+    
+    annotations:
+      specificity_score: "0.45"
+      specificity_rationale: "Moderately specific - institutional classification is heritage-relevant."
+    
+    examples:
+      - value:
+          type_id: https://nde.nl/ontology/hc/scope-type/institutional
+          type_label: ["Institutional@en", "institutioneel@nl"]
+        description: Institutional scope type instance
+
+  # =============================================================================
+  # COLLECTION SCOPE TYPES
+  # =============================================================================
+  
+  CollectionScope:
+    is_a: ScopeType
+    class_uri: schema:Collection
+    description: |
+      Collection-based scope dimension covering collection types and sizes.
+      
+      **Examples**:
+      - "Small collection (<1000 items)" (size scope)
+      - "Research collection" (function scope)
+      - "Public access collection" (access scope)
+    
+    close_mappings:
+      - schema:Collection
+    
+    annotations:
+      specificity_score: "0.55"
+      specificity_rationale: "More specific - collection scoping is heritage-domain focused."
+    
+    examples:
+      - value:
+          type_id: https://nde.nl/ontology/hc/scope-type/collection
+          type_label: ["Collection@en", "collectie@nl"]
+        description: Collection scope type instance
+
+  # =============================================================================
+  # FORMAT SCOPE TYPES
+  # =============================================================================
+  
+  FormatScope:
+    is_a: ScopeType
+    class_uri: dct:format
+    description: |
+      Format scope dimension covering file formats and data standards.
+      
+      **Examples**:
+      - "JPEG/TIFF" (image formats)
+      - "Dublin Core" (metadata standard)
+      - "EAD" (archival encoding)
+    
+    exact_mappings:
+      - dct:format
+    
+    annotations:
+      specificity_score: "0.50"
+      specificity_rationale: "More specific - format scoping is technical/domain focused."
+    
+    examples:
+      - value:
+          type_id: https://nde.nl/ontology/hc/scope-type/format
+          type_label: ["Format@en", "formaat@nl"]
+        description: Format scope type instance

frontend/public/schemas/20251121/linkml/modules/classes/TimeInterval.yaml

@@ -0,0 +1,112 @@
+# TimeInterval - A duration or interval of time
+# Created per slot_fixes.yaml migration for: update_frequency, typical_approval_time, total_revenue
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/classes/TimeInterval
+name: TimeInterval
+title: TimeInterval
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  time: http://www.w3.org/2006/time#
+  schema: http://schema.org/
+  xsd: http://www.w3.org/2001/XMLSchema#
+
+imports:
+  - linkml:types
+
+default_range: string
+
+classes:
+  TimeInterval:
+    description: >-
+      A duration or interval of time, representing a period rather than a point.
+      
+      **DISTINCTION FROM TimeSpan**:
+      - `TimeSpan` represents a bounded period with begin/end points (CIDOC-CRM E52)
+      - `TimeInterval` represents a duration/interval (e.g., "2 weeks", "quarterly")
+      
+      **USE CASES**:
+      - Update frequency: "updated weekly"
+      - Approval time: "typically 2-3 business days"
+      - Reporting period: "annual revenue for fiscal year"
+      
+      **ONTOLOGY MAPPING**:
+      - class_uri: time:Duration (W3C Time Ontology)
+      - Supports ISO 8601 duration format (P1Y, P2M, P3D, PT4H)
+      
+    class_uri: time:Duration
+    
+    close_mappings:
+      - schema:Duration
+    
+    related_mappings:
+      - time:Interval
+      - time:TemporalDuration
+    
+    attributes:
+      duration_value:
+        range: string
+        description: >-
+          ISO 8601 duration string (e.g., P1Y, P2M, P7D, PT24H).
+          P = period, Y = years, M = months, D = days, T = time separator, H = hours
+      
+      duration_description:
+        range: string
+        description: >-
+          Human-readable description of the duration.
+          Examples: "weekly", "monthly", "annual", "2-3 business days"
+      
+      years:
+        range: integer
+        description: Number of years in the interval.
+        minimum_value: 0
+      
+      months:
+        range: integer
+        description: Number of months in the interval.
+        minimum_value: 0
+      
+      days:
+        range: integer
+        description: Number of days in the interval.
+        minimum_value: 0
+      
+      hours:
+        range: integer
+        description: Number of hours in the interval.
+        minimum_value: 0
+      
+      minutes:
+        range: integer
+        description: Number of minutes in the interval.
+        minimum_value: 0
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: >-
+        Time intervals applicable to all custodian types for various purposes.
+      custodian_types_primary: "*"
+      specificity_score: 0.25
+      specificity_rationale: >-
+        Low specificity - universal temporal concept.
+    
+    examples:
+      - value: |
+          TimeInterval:
+            duration_value: "P7D"
+            duration_description: "weekly"
+        description: A one-week interval for update frequency.
+      
+      - value: |
+          TimeInterval:
+            duration_value: "P1Y"
+            duration_description: "annual"
+        description: A one-year interval for revenue reporting.
+      
+      - value: |
+          TimeInterval:
+            days: 3
+            duration_description: "2-3 business days"
+        description: Typical approval time interval.

frontend/public/schemas/20251121/linkml/modules/classes/TimeSpan.yaml

@@ -18,6 +18,7 @@ imports:
 - ../slots/template_specificity
 - ./SpecificityAnnotation
 - ./TemplateSpecificityScores
+- ./Timestamp
 default_range: string
 classes:
   TimeSpan:

frontend/public/schemas/20251121/linkml/modules/classes/Timestamp.yaml

@@ -0,0 +1,151 @@
+# Timestamp class
+# A point in time with optional precision and calendar metadata
+#
+# Generation date: 2026-01-15
+# Rule compliance: 0 (LinkML single source of truth), 38 (slot centralization), 53 (slot_fixes.yaml)
+#
+# This class supports 6 slot migrations per slot_fixes.yaml:
+# - valid_to_geo
+# - valid_to
+# - valid_from_geo
+# - valid_from
+# - updated_at
+# - unesco_inscription_year
+#
+# Ontological basis: OWL Time Instant (time:Instant)
+
+id: https://nde.nl/ontology/hc/class/Timestamp
+name: timestamp_class
+title: Timestamp Class
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  time: http://www.w3.org/2006/time#
+  xsd: http://www.w3.org/2001/XMLSchema#
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  schema: http://schema.org/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ../metadata
+  - ../slots/timestamp_value
+  - ../slots/timestamp_precision
+  - ../slots/calendar_system
+  - ../slots/specificity_annotation
+  - ../slots/template_specificity
+  - ./SpecificityAnnotation
+  - ./TemplateSpecificityScores
+
+classes:
+  Timestamp:
+    class_uri: time:Instant
+    description: |
+      A point in time with optional precision and calendar metadata.
+      
+      **Purpose**:
+      Timestamp provides a reusable class for representing temporal instants
+      with explicit precision indicators. This supports EDTF-style partial
+      dates (year-only, year-month, full date, datetime) and calendar system
+      annotation for non-Gregorian dates.
+      
+      **Ontological Alignment**:
+      - **Primary**: `time:Instant` - OWL Time instant
+      - **Close**: `crm:E61_Time_Primitive` - CIDOC-CRM time primitive
+      - **Related**: `xsd:dateTime` - XML Schema dateTime
+      
+      **Use Cases**:
+      - Beginning/ending of time spans (TimeSpan.begin_of_the_begin, etc.)
+      - Validity dates (valid_from, valid_to)
+      - Update timestamps (updated_at, created_at)
+      - Historical dates with varying precision
+      
+      **Precision Levels**:
+      - year: "1995" (EDTF: "1995")
+      - month: "1995-06" (EDTF: "1995-06")
+      - day: "1995-06-15" (EDTF: "1995-06-15")
+      - datetime: "1995-06-15T10:30:00" (full precision)
+      
+      **Replaces** (per slot_fixes.yaml):
+      - `valid_to_geo` → TimeSpan.end_of_the_end: Timestamp
+      - `valid_to` → TimeSpan.end_of_the_end: Timestamp
+      - `valid_from_geo` → TimeSpan.begin_of_the_begin: Timestamp
+      - `valid_from` → TimeSpan.begin_of_the_begin: Timestamp
+      - `updated_at` → was_last_updated_at: TimeSpan
+      - `unesco_inscription_year` → TimeSpan.begin_of_the_begin: Timestamp
+      
+    exact_mappings:
+      - time:Instant
+    
+    close_mappings:
+      - crm:E61_Time_Primitive
+    
+    related_mappings:
+      - xsd:dateTime
+      - schema:DateTime
+    
+    slots:
+      - timestamp_value
+      - timestamp_precision
+      - calendar_system
+      - specificity_annotation
+      - template_specificity
+    
+    slot_usage:
+      timestamp_value:
+        description: |
+          The timestamp value as ISO 8601 string.
+          Precision determined by string format:
+          - "1995" = year precision
+          - "1995-06" = month precision
+          - "1995-06-15" = day precision
+          - "1995-06-15T10:30:00Z" = full datetime
+        range: string
+        required: true
+        pattern: "^-?\\d{4}(-\\d{2})?(-\\d{2})?(T\\d{2}:\\d{2}(:\\d{2})?(\\.\\d+)?(Z|[+-]\\d{2}:\\d{2})?)?$"
+      timestamp_precision:
+        description: |
+          Explicit precision level. Auto-derived from timestamp_value if not provided.
+          Values: year, month, day, hour, minute, second, millisecond
+        range: string
+        required: false
+        examples:
+          - value: year
+          - value: day
+          - value: second
+      calendar_system:
+        description: |
+          Calendar system for the timestamp. Default is Gregorian.
+          For historical or non-Western dates, specify the calendar.
+        range: string
+        required: false
+        examples:
+          - value: gregorian
+          - value: julian
+          - value: hebrew
+          - value: islamic
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: Generic timestamp class applicable to all types.
+      custodian_types_primary: null
+      specificity_score: 0.15
+      specificity_rationale: Very broadly applicable generic class for temporal points.
+    
+    examples:
+      - value: |
+          timestamp_value: "1995"
+          timestamp_precision: year
+        description: "Year-only timestamp (e.g., founding year)"
+      - value: |
+          timestamp_value: "2024-06-15"
+          timestamp_precision: day
+          calendar_system: gregorian
+        description: "Full date timestamp"
+      - value: |
+          timestamp_value: "2024-06-15T14:30:00Z"
+          timestamp_precision: second
+          calendar_system: gregorian
+        description: "Full datetime timestamp"

frontend/public/schemas/20251121/linkml/modules/classes/TransferEvent.yaml

@@ -0,0 +1,144 @@
+# TransferEvent class
+# Custody or ownership transfer event
+#
+# Generation date: 2026-01-15
+# Rule compliance: 0 (LinkML single source of truth), 38 (slot centralization), 53 (slot_fixes.yaml)
+#
+# This class supports 4 slot migrations per slot_fixes.yaml:
+# - transfer_to_collection_date → is_or_was_transferred + TransferEvent
+# - transfer_policy → is_or_was_transferred + TransferEvent
+# - transfer_location_text → is_or_was_transferred + TransferEvent
+# - transfer_location → is_or_was_transferred + TransferEvent
+
+id: https://nde.nl/ontology/hc/class/TransferEvent
+name: transfer_event_class
+title: TransferEvent Class
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  rico: https://www.ica.org/standards/RiC/ontology#
+  prov: http://www.w3.org/ns/prov#
+  schema: http://schema.org/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ../metadata
+  - ../slots/temporal_extent
+  - ../slots/starts_or_started_at_location
+  - ../slots/ends_or_ended_at_location
+  - ../slots/has_or_had_description
+  - ../slots/has_or_had_policy
+  - ../slots/specificity_annotation
+  - ../slots/template_specificity
+  - ./TimeSpan
+  - ./Location
+  - ./TransferPolicy
+  - ./Description
+  - ./SpecificityAnnotation
+  - ./TemplateSpecificityScores
+
+classes:
+  TransferEvent:
+    class_uri: crm:E10_Transfer_of_Custody
+    description: |
+      Event representing transfer of custody, ownership, or physical location.
+      
+      **Purpose**:
+      TransferEvent models significant transfers in heritage contexts:
+      - Collection transfers between institutions
+      - Relocation of holdings
+      - Custody changes (legal guardianship)
+      - Ownership changes
+      
+      **Ontological Alignment**:
+      - **Primary**: `crm:E10_Transfer_of_Custody` - CIDOC-CRM custody transfer
+      - **Close**: `rico:TransferEvent` - RiC-O transfer event
+      - **Related**: `prov:Activity` - PROV-O activity (general activity)
+      
+      **Key Components**:
+      - `temporal_extent`: When the transfer occurred (TimeSpan)
+      - `starts_or_started_at_location`: Origin location
+      - `ends_or_ended_at_location`: Destination location
+      - `has_or_had_policy`: Transfer policy governing the transfer
+      - `has_or_had_description`: Narrative description
+      
+      **Replaces** (per slot_fixes.yaml):
+      - `transfer_to_collection_date` (simple date)
+      - `transfer_policy` (simple string)
+      - `transfer_location` (simple string)
+      - `transfer_location_text` (simple string)
+      
+    exact_mappings:
+      - crm:E10_Transfer_of_Custody
+    
+    close_mappings:
+      - rico:TransferEvent
+    
+    related_mappings:
+      - prov:Activity
+      - schema:TransferAction
+    
+    slots:
+      - temporal_extent
+      - starts_or_started_at_location
+      - ends_or_ended_at_location
+      - has_or_had_description
+      - has_or_had_policy
+      - specificity_annotation
+      - template_specificity
+    
+    slot_usage:
+      temporal_extent:
+        description: |
+          When the transfer occurred. Can be a single date or date range.
+        range: TimeSpan
+        required: false
+        inlined: true
+      starts_or_started_at_location:
+        description: |
+          Origin location - where the transferred items came from.
+        range: Location
+        required: false
+        inlined: true
+      ends_or_ended_at_location:
+        description: |
+          Destination location - where the transferred items went to.
+        range: Location
+        required: false
+        inlined: true
+      has_or_had_description:
+        description: |
+          Narrative description of the transfer event.
+        range: Description
+        required: false
+        inlined: true
+      has_or_had_policy:
+        description: |
+          Policy that governed this transfer.
+        range: TransferPolicy
+        required: false
+        inlined: true
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: Transfer events apply to all heritage custodian types.
+      custodian_types_primary: null
+      specificity_score: 0.5
+      specificity_rationale: Specialized event type for custody/ownership changes.
+    
+    examples:
+      - value: |
+          temporal_extent:
+            begin_of_the_begin:
+              timestamp_value: "2020-01-15T00:00:00Z"
+          starts_or_started_at_location:
+            location_name: "Old Storage Facility"
+          ends_or_ended_at_location:
+            location_name: "New Archive Building"
+          has_or_had_description:
+            description_text: "Transfer of historical photographs to new climate-controlled facility"
+        description: "Collection relocation transfer"

frontend/public/schemas/20251121/linkml/modules/classes/TransferPolicy.yaml

@@ -0,0 +1,101 @@
+# TransferPolicy class
+# Policy governing custody or ownership transfers
+#
+# Generation date: 2026-01-15
+# Rule compliance: 0 (LinkML single source of truth), 38 (slot centralization), 53 (slot_fixes.yaml)
+#
+# Supports migration: transfer_policy → is_or_was_transferred + TransferEvent + has_or_had_policy + TransferPolicy
+
+id: https://nde.nl/ontology/hc/class/TransferPolicy
+name: transfer_policy_class
+title: TransferPolicy Class
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  rico: https://www.ica.org/standards/RiC/ontology#
+  dcterms: http://purl.org/dc/terms/
+  odrl: http://www.w3.org/ns/odrl/2/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ../metadata
+  - ../slots/policy_name
+  - ../slots/policy_text
+  - ../slots/has_or_had_description
+  - ../slots/specificity_annotation
+  - ../slots/template_specificity
+  - ./Description
+  - ./SpecificityAnnotation
+  - ./TemplateSpecificityScores
+
+classes:
+  TransferPolicy:
+    class_uri: odrl:Policy
+    description: |
+      Policy governing custody or ownership transfers.
+      
+      **Purpose**:
+      TransferPolicy captures the rules and conditions under which
+      heritage materials may be transferred between institutions,
+      including donor restrictions and legal requirements.
+      
+      **Ontological Alignment**:
+      - **Primary**: `odrl:Policy` - ODRL policy (rights/rules)
+      - **Close**: `rico:RecordResourceTransferRule` - RiC-O transfer rule
+      - **Related**: `dcterms:RightsStatement` - rights/access statement
+      
+      **Use Cases**:
+      - Donor restrictions on collection transfers
+      - Deaccessioning policies
+      - Inter-institutional loan agreements
+      - Government archive transfer regulations
+      
+    exact_mappings:
+      - odrl:Policy
+    
+    close_mappings:
+      - rico:RecordResourceTransferRule
+    
+    related_mappings:
+      - dcterms:RightsStatement
+    
+    slots:
+      - policy_name
+      - policy_text
+      - has_or_had_description
+      - specificity_annotation
+      - template_specificity
+    
+    slot_usage:
+      policy_name:
+        description: |
+          Name or title of the transfer policy.
+        range: string
+        required: false
+      policy_text:
+        description: |
+          Full text of the policy.
+        range: string
+        required: false
+      has_or_had_description:
+        description: |
+          Summary description of the policy.
+        range: Description
+        required: false
+        inlined: true
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: Transfer policies apply to all heritage types.
+      custodian_types_primary: null
+      specificity_score: 0.55
+      specificity_rationale: Specialized policy type for transfer governance.
+    
+    examples:
+      - value: |
+          policy_name: "Donor Transfer Restriction"
+          policy_text: "Materials may not be transferred to institutions outside the Netherlands without donor consent."
+        description: "Donor-imposed transfer restriction"

frontend/public/schemas/20251121/linkml/modules/classes/URL.yaml

@@ -0,0 +1,121 @@
+# URL class
+# Structured URL representation with type and metadata
+#
+# Generation date: 2026-01-15
+# Rule compliance: 0 (LinkML single source of truth), 38 (slot centralization), 53 (slot_fixes.yaml)
+#
+# This class supports 4 slot migrations per slot_fixes.yaml:
+# - website → has_or_had_url + URL
+# - url → has_or_had_url + URL
+# - vendor_url → has_or_had_url + URL
+# - was_archived_at → is_or_was_webarchived_at + URL
+
+id: https://nde.nl/ontology/hc/class/URL
+name: url_class
+title: URL Class
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  dcterms: http://purl.org/dc/terms/
+  prov: http://www.w3.org/ns/prov#
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ../metadata
+  - ../slots/url_value
+  - ../slots/url_type
+  - ../slots/language
+  - ../slots/specificity_annotation
+  - ../slots/template_specificity
+  - ./SpecificityAnnotation
+  - ./TemplateSpecificityScores
+
+classes:
+  URL:
+    class_uri: schema:URL
+    description: |
+      Structured representation of a URL with type classification and metadata.
+      
+      **Purpose**:
+      URL provides a reusable class for representing web addresses with
+      additional context about what type of URL it is (website, API, archive, etc.)
+      and optional language/locale information.
+      
+      **Ontological Alignment**:
+      - **Primary**: `schema:URL` - Schema.org URL datatype
+      - **Close**: `dcterms:URI` - Dublin Core URI
+      - **Related**: `prov:Entity` - Provenance entity (for archived URLs)
+      
+      **Use Cases**:
+      - Institution websites: `has_or_had_url` with type "website"
+      - API endpoints: `has_or_had_url` with type "api"
+      - Web archive snapshots: `is_or_was_webarchived_at` with archive URL
+      - Vendor/supplier sites: `has_or_had_url` with type "vendor"
+      
+      **Replaces** (per slot_fixes.yaml):
+      - `website` (simple string URL)
+      - `url` (simple string URL)
+      - `vendor_url` (simple string URL)
+      - `was_archived_at` (simple string URL)
+      
+    exact_mappings:
+      - schema:URL
+    
+    close_mappings:
+      - dcterms:URI
+    
+    related_mappings:
+      - prov:Entity
+    
+    slots:
+      - url_value
+      - url_type
+      - language
+      - specificity_annotation
+      - template_specificity
+    
+    slot_usage:
+      url_value:
+        description: |
+          The actual URL string (e.g., https://example.org/).
+        range: uri
+        required: true
+      url_type:
+        description: |
+          Classification of the URL type (website, api, archive, etc.).
+        range: string
+        required: false
+      language:
+        description: |
+          Language/locale of the content at this URL.
+          ISO 639-1 code, optionally with region (e.g., "en", "nl-NL").
+        range: string
+        required: false
+        pattern: "^[a-z]{2}(-[A-Z]{2})?$"
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: URLs apply to all heritage custodian types.
+      custodian_types_primary: null
+      specificity_score: 0.15
+      specificity_rationale: Generic URL class applicable across all contexts.
+    
+    examples:
+      - value: |
+          url_value: "https://www.rijksmuseum.nl/"
+          url_type: website
+          language: nl
+        description: "Official website URL for Rijksmuseum"
+      - value: |
+          url_value: "https://api.rijksmuseum.nl/api/nl/collection"
+          url_type: api
+          language: nl
+        description: "API endpoint for Rijksmuseum collection"
+      - value: |
+          url_value: "https://web.archive.org/web/20240101/https://example.org/"
+          url_type: webarchive
+        description: "Web archive snapshot URL"

frontend/public/schemas/20251121/linkml/modules/classes/UpdateFrequency.yaml

@@ -0,0 +1,175 @@
+# UpdateFrequency - Structured frequency/periodicity for data updates
+# Created per slot_fixes.yaml migration for: update_frequency
+# Creation date: 2026-01-14
+#
+# REVISION FROM slot_fixes.yaml (lines 1893-1910):
+#   - label: has_or_had_frequency (slot)
+#   - label: UpdateFrequency (class) ← THIS FILE
+#   - link_branch 1: has_or_had_quantity → Quantity
+#   - link_branch 2: has_or_had_time_interval → TimeInterval
+
+id: https://nde.nl/ontology/hc/classes/UpdateFrequency
+name: UpdateFrequency
+title: UpdateFrequency
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  dcterms: http://purl.org/dc/terms/
+  dcat: http://www.w3.org/ns/dcat#
+  schema: http://schema.org/
+  time: http://www.w3.org/2006/time#
+
+imports:
+  - linkml:types
+  - ./Quantity
+  - ./TimeInterval
+  - ../slots/has_or_had_quantity
+  - ../slots/has_or_had_time_interval
+
+default_range: string
+
+classes:
+  UpdateFrequency:
+    description: >-
+      Structured representation of how often a device, system, or data source
+      sends updates or refreshes data.
+      
+      **WHY A DEDICATED CLASS?**
+      
+      Update frequency is more than a simple string - it has:
+      - **Quantity**: How many updates (e.g., "5" in "every 5 minutes")
+      - **Time Interval**: The period (e.g., "minutes" in "every 5 minutes")
+      - **Trigger-based**: Some updates are event-driven, not time-based
+      
+      **SLOT_FIXES.YAML REVISION** (lines 1893-1910):
+      - Branch 1: has_or_had_quantity → Quantity (numeric value)
+      - Branch 2: has_or_had_time_interval → TimeInterval (duration)
+      
+      **ONTOLOGY MAPPING**:
+      - class_uri: dcterms:Frequency (Dublin Core)
+      - Dublin Core `accrualPeriodicity` uses Frequency for collection update rates
+      
+      **USE CASES**:
+      - IoT sensors: "Every 5 minutes", "Hourly", "Real-time"
+      - Data feeds: "Daily", "Weekly", "Monthly"
+      - Event-driven: "On proximity trigger", "On change"
+      
+      **EXAMPLES**:
+      - Climate sensor: 5 updates per minute
+      - Beacon: On proximity trigger (no time interval)
+      - Database sync: Daily at midnight
+      
+    class_uri: dcterms:Frequency
+    
+    exact_mappings:
+      - dcterms:Frequency
+      - dcat:frequency
+    
+    close_mappings:
+      - schema:Schedule
+    
+    related_mappings:
+      - time:TemporalEntity
+    
+    slots:
+      - has_or_had_quantity
+      - has_or_had_time_interval
+    
+    attributes:
+      frequency_description:
+        range: string
+        description: >-
+          Human-readable description of the update frequency.
+          Examples: "Every 5 minutes", "Hourly", "Real-time", "On proximity trigger"
+      
+      is_event_driven:
+        range: boolean
+        description: >-
+          True if updates are triggered by events rather than time intervals.
+          Examples: beacon proximity triggers, change detection, user actions.
+        ifabsent: "false"
+      
+      trigger_type:
+        range: string
+        description: >-
+          Type of event that triggers updates (when is_event_driven is true).
+          Examples: "proximity", "change", "request", "threshold"
+    
+    slot_usage:
+      has_or_had_quantity:
+        range: Quantity
+        inlined: true
+        description: >-
+          The numeric quantity component of the frequency.
+          For "every 5 minutes", this would be a Quantity with value 5.
+        examples:
+          - value: |
+              has_or_had_quantity:
+                numeric_value: 5
+                has_or_had_measurement_unit:
+                  unit_symbol: "updates"
+            description: 5 updates per interval
+      
+      has_or_had_time_interval:
+        range: TimeInterval
+        inlined: true
+        description: >-
+          The time interval/period component of the frequency.
+          For "every 5 minutes", this would be a TimeInterval representing minutes.
+        examples:
+          - value: |
+              has_or_had_time_interval:
+                duration_value: "PT1M"
+                duration_description: "per minute"
+            description: Per-minute interval
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: >-
+        Update frequency applicable to all custodian types with IoT or data systems.
+      custodian_types_primary: "*"
+      specificity_score: 0.35
+      specificity_rationale: >-
+        Moderate specificity - relevant to custodians with digital/IoT infrastructure.
+    
+    examples:
+      - value: |
+          UpdateFrequency:
+            frequency_description: "Every 5 minutes"
+            has_or_had_quantity:
+              numeric_value: 5
+            has_or_had_time_interval:
+              duration_value: "PT1M"
+              duration_description: "minute"
+        description: Climate sensor updating every 5 minutes.
+      
+      - value: |
+          UpdateFrequency:
+            frequency_description: "Hourly"
+            has_or_had_quantity:
+              numeric_value: 1
+            has_or_had_time_interval:
+              duration_value: "PT1H"
+              duration_description: "hour"
+        description: Hourly update frequency.
+      
+      - value: |
+          UpdateFrequency:
+            frequency_description: "On proximity trigger"
+            is_event_driven: true
+            trigger_type: "proximity"
+        description: Event-driven beacon updates (no time interval).
+      
+      - value: |
+          UpdateFrequency:
+            frequency_description: "Real-time"
+            is_event_driven: true
+            trigger_type: "continuous"
+        description: Real-time streaming updates.
+    
+    comments:
+      - Created from slot_fixes.yaml migration (2026-01-14)
+      - Replaces simple string update_frequency slot
+      - Supports both time-based and event-driven frequencies
+      - Uses Dublin Core Frequency class for semantic alignment

frontend/public/schemas/20251121/linkml/modules/classes/VideoAnnotationTypes.yaml

@@ -5,6 +5,8 @@ imports:
 - linkml:types
 - ./VideoAnnotation
 - ./VideoTimeSegment
+- ./Quantity
+- ./Methodology
 - ../slots/person_id
 - ../slots/has_average_scene_duration_seconds
 - ../slots/cut_count
@@ -12,6 +14,7 @@ imports:
 - ../slots/has_or_had_detected_landmark
 - ../slots/has_or_had_detected_logo
 - ../slots/has_or_had_detected_object
+- ../slots/has_or_had_quantity
 - ../slots/detection_level
 - ../slots/dissolve_count
 - ../slots/face_bbox
@@ -60,8 +63,6 @@ imports:
 - ../slots/total_characters_extracted
 - ../slots/tracking_ids_assigned
 - ../slots/transition_types_detected
-- ../slots/unique_face_count
-- ../slots/unique_object_count
 - ./SpecificityAnnotation
 - ./TemplateSpecificityScores
 - ../enums/DetectionLevelEnum
@@ -299,14 +300,13 @@ classes:
     - has_or_had_detected_landmark
     - has_or_had_detected_logo
     - has_or_had_detected_object
+    - has_or_had_quantity
     - includes_object_tracking
     - linked_to_collection
     - object_classes_detected
     - specificity_annotation
     - template_specificity
     - tracking_ids_assigned
-    - unique_face_count
-    - unique_object_count
     slot_usage:
       has_or_had_detected_object:
         range: DetectedObject
@@ -340,20 +340,34 @@ classes:
         examples:
         - value: '[{label: ''Rijksmuseum building'', wikidata_id: ''Q190804''}]'
           description: Detected landmark with Wikidata link
-      unique_object_count:
+      has_or_had_quantity:
-        range: integer
+        range: Quantity
+        multivalued: true
         required: false
-        minimum_value: 0
+        inlined_as_list: true
+        description: >-
+          Quantities for unique object/face counts with methodology tracking.
+          RULE 53: Replaces unique_object_count and unique_face_count slots.
+          Use has_or_had_measurement_unit to specify OBJECT or FACE unit type.
+          Use has_or_had_methodology to document entity resolution approach.
         examples:
-        - value: 15
+        - value:
-          description: 15 unique objects identified
+            quantity_value: 15
-      unique_face_count:
+            has_or_had_measurement_unit:
-        range: integer
+              unit_type: OBJECT
-        required: false
+            has_or_had_methodology:
-        minimum_value: 0
+              methodology_type: ENTITY_RESOLUTION
-        examples:
+              has_or_had_label: "DeepSORT tracking + embedding clustering"
-        - value: 3
+          description: 15 unique objects identified via entity resolution
-          description: 3 unique people identified
+        - value:
+            quantity_value: 3
+            has_or_had_measurement_unit:
+              unit_type: FACE
+            has_or_had_methodology:
+              methodology_type: ENTITY_RESOLUTION
+              has_or_had_label: "ArcFace clustering"
+              confidence_threshold: 0.6
+          description: 3 unique people identified via face clustering
       object_classes_detected:
         range: string
         multivalued: true

frontend/public/schemas/20251121/linkml/modules/classes/VideoPost.yaml

@@ -36,7 +36,9 @@ imports:
 - ../slots/template_specificity
 - ../slots/video_category_id
 - ../slots/video_comment
-- ../slots/view_count
+- ../slots/has_or_had_quantity
+- ./Quantity
+# MIGRATED 2026-01-15: ../slots/view_count → ../slots/has_or_had_quantity per Rule 53
 - ./SpecificityAnnotation
 - ./TemplateSpecificityScores
 - ../slots/definition
@@ -103,7 +105,7 @@ classes:
 
       | caption | - | schema:caption |
 
-      | view_count | - | schema:interactionStatistic |
+      | view_count | - | schema:interactionStatistic (via Quantity) |
 
 
       **PLATFORM SUPPORT**:
@@ -214,7 +216,7 @@ classes:
     - template_specificity
     - video_category_id
     - video_comment
-    - view_count
+    - has_or_had_quantity
     slot_usage:
       duration:
         range: string
@@ -275,12 +277,19 @@ classes:
           - en
           - de
           description: Captions available in Dutch, English, German
-      view_count:
+      has_or_had_quantity:
-        range: integer
+        range: Quantity
-        required: false
+        inlined: true
-        minimum_value: 0
+        description: >-
+          View count for video. RULE 53: Replaces deprecated view_count with
+          structured Quantity class supporting measurement unit (VIEW) and
+          temporal extent for point-in-time observation.
         examples:
-        - value: 132
+        - value:
+            numeric_value: 132
+            has_or_had_measurement_unit: VIEW
+            temporal_extent:
+              begin_of_the_begin: "2025-12-01T23:16:22Z"
           description: 132 views at observation time
       like_count:
         range: integer

frontend/public/schemas/20251121/linkml/modules/classes/VisitingScholar.yaml

@@ -0,0 +1,94 @@
+# VisitingScholar - Visiting scholar/researcher programs accepted by institution
+# Created per slot_fixes.yaml migration for: accepts_or_accepted_visiting_scholar
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/classes/VisitingScholar
+name: VisitingScholar
+title: VisitingScholar
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+
+imports:
+  - linkml:types
+
+default_range: string
+
+classes:
+  VisitingScholar:
+    description: >-
+      Information about visiting scholar or researcher programs accepted by an institution.
+      
+      **CONTEXT**:
+      Many heritage institutions accept visiting researchers who need access to
+      collections, archives, or special materials for academic research.
+      
+      **PROGRAM TYPES**:
+      - Short-term research visits
+      - Fellowship programs
+      - Residencies
+      - Affiliated researcher positions
+      
+      Used with `accepts_or_accepted` slot to indicate researcher access programs.
+      
+    class_uri: schema:ResearchProject
+    
+    close_mappings:
+      - schema:ScholarlyArticle
+    
+    attributes:
+      program_type:
+        range: string
+        required: true
+        description: >-
+          Type of visiting program (e.g., "fellowship", "residency", "short_term_visit").
+      
+      duration:
+        range: string
+        description: >-
+          Typical duration of visits (e.g., "1-4 weeks", "3-12 months").
+      
+      eligibility:
+        range: string
+        multivalued: true
+        description: >-
+          Eligibility requirements (e.g., "PhD candidates", "University affiliates").
+      
+      application_process:
+        range: string
+        description: >-
+          Description of the application process.
+      
+      stipend_available:
+        range: boolean
+        description: >-
+          Whether financial support/stipend is available.
+    
+    annotations:
+      custodian_types: '["A", "L", "R", "M"]'
+      custodian_types_rationale: >-
+        Visiting scholar programs primarily at archives, libraries, research centers, museums.
+      custodian_types_primary: "A"
+      specificity_score: 0.75
+      specificity_rationale: >-
+        High specificity - specific to research access programs.
+    
+    examples:
+      - value: |
+          VisitingScholar:
+            program_type: "fellowship"
+            duration: "3-6 months"
+            eligibility:
+              - "PhD candidates"
+              - "Post-doctoral researchers"
+            stipend_available: true
+        description: Fellowship program for researchers.
+      
+      - value: |
+          VisitingScholar:
+            program_type: "short_term_visit"
+            duration: "1-4 weeks"
+            application_process: "Submit research proposal via email"
+        description: Short-term research visit program.

frontend/public/schemas/20251121/linkml/modules/classes/WikiDataEntry.yaml

@@ -0,0 +1,134 @@
+# WikiDataEntry class
+# Reference to a Wikidata entity for alignments and equivalences
+#
+# Generation date: 2026-01-15
+# Rule compliance: 0 (LinkML single source of truth), 38 (slot centralization), 53 (slot_fixes.yaml)
+#
+# This class supports 5 slot migrations per slot_fixes.yaml:
+# - wikidata_mapping
+# - wikidata_equivalent
+# - wikidata_class
+# - wikidata_alignment
+# - wikidata
+#
+# NOTE: Similar to WikidataEntity but designed as migration target for slot_fixes.yaml
+
+id: https://nde.nl/ontology/hc/class/WikiDataEntry
+name: wikidata_entry_class
+title: WikiDataEntry Class
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  wikibase: http://wikiba.se/ontology#
+  wd: http://www.wikidata.org/entity/
+  schema: http://schema.org/
+  skos: http://www.w3.org/2004/02/skos/core#
+  prov: http://www.w3.org/ns/prov#
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ../metadata
+  - ../slots/wikidata_qid
+  - ../slots/wikidata_label
+  - ../slots/wikidata_description
+  - ../slots/language
+  - ../slots/specificity_annotation
+  - ../slots/template_specificity
+  - ./SpecificityAnnotation
+  - ./TemplateSpecificityScores
+
+classes:
+  WikiDataEntry:
+    class_uri: wikibase:Item
+    description: |
+      Reference to a Wikidata entity (Q-item) for alignments and equivalences.
+      
+      **Purpose**:
+      WikiDataEntry provides a reusable class for representing Wikidata entity
+      references with Q-number identifier, label, and description.
+      Used for ontology alignments, equivalence mappings, and classification.
+      
+      **Ontological Alignment**:
+      - **Primary**: `wikibase:Item` - Wikibase item class
+      - **Close**: `schema:Thing` - general web entity
+      - **Related**: `skos:Concept` - controlled vocabulary concept
+      
+      **Use Cases**:
+      - Ontology alignment: `wikidata_alignment` → relates schema class to Wikidata Q
+      - Equivalence: `wikidata_equivalent` → marks semantic equivalence
+      - Classification: `wikidata_class` → instance_of relationship
+      - General mapping: `wikidata_mapping` → related concept
+      
+      **Replaces** (per slot_fixes.yaml):
+      - `wikidata_mapping` (string Q-number)
+      - `wikidata_equivalent` (string Q-number)
+      - `wikidata_class` (string Q-number)
+      - `wikidata_alignment` (string Q-number)
+      - `wikidata` (string Q-number)
+      
+    exact_mappings:
+      - wikibase:Item
+    
+    close_mappings:
+      - schema:Thing
+    
+    related_mappings:
+      - skos:Concept
+      - prov:Entity
+    
+    slots:
+      - wikidata_qid
+      - wikidata_label
+      - wikidata_description
+      - language
+      - specificity_annotation
+      - template_specificity
+    
+    slot_usage:
+      wikidata_qid:
+        description: |
+          The Wikidata Q-number identifier (e.g., Q12345).
+        range: string
+        required: true
+        pattern: "^Q[0-9]+$"
+      wikidata_label:
+        description: |
+          Human-readable label from Wikidata.
+        range: string
+        required: false
+      wikidata_description:
+        description: |
+          Description from Wikidata.
+        range: string
+        required: false
+      language:
+        description: |
+          Language code for the label and description.
+          Default: "en"
+        range: string
+        required: false
+        pattern: "^[a-z]{2}(-[A-Z]{2})?$"
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: Generic Wikidata reference class applicable to all types.
+      custodian_types_primary: null
+      specificity_score: 0.2
+      specificity_rationale: Broadly applicable generic class for Wikidata links.
+    
+    examples:
+      - value: |
+          wikidata_qid: "Q33506"
+          wikidata_label: "museum"
+          wikidata_description: "institution that holds and displays collections"
+          language: en
+        description: "Wikidata reference for 'museum' concept"
+      - value: |
+          wikidata_qid: "Q190804"
+          wikidata_label: "Rijksmuseum"
+          wikidata_description: "Dutch national museum in Amsterdam"
+          language: en
+        description: "Wikidata reference for specific institution"

frontend/public/schemas/20251121/linkml/modules/classes/WikiDataIdentifier.yaml

@@ -0,0 +1,91 @@
+# WikiDataIdentifier - A Wikidata Q-number identifier
+# Created per slot_fixes.yaml migration for: wikidata_id, wikidata_entity_id, wikidata_entity
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/classes/WikiDataIdentifier
+name: WikiDataIdentifier
+title: WikiDataIdentifier
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  wikidata: http://www.wikidata.org/entity/
+  schema: http://schema.org/
+  dct: http://purl.org/dc/terms/
+
+imports:
+  - linkml:types
+
+default_range: string
+
+classes:
+  WikiDataIdentifier:
+    description: >-
+      A Wikidata entity identifier (Q-number) that uniquely identifies an entity
+      in the Wikidata knowledge base.
+      
+      **DISTINCTION FROM WikiDataEntry**:
+      - `WikiDataIdentifier` is for simple Q-number storage (identifier only)
+      - `WikiDataEntry` includes full entity data (label, description, claims)
+      
+      Use `WikiDataIdentifier` when:
+      - Only storing the Q-number reference
+      - Linking to Wikidata without caching entity data
+      
+      **FORMAT**: Q followed by digits (e.g., Q190804 for Rijksmuseum)
+      **URL PATTERN**: https://www.wikidata.org/wiki/Q{number}
+      
+    class_uri: dct:Identifier
+    
+    close_mappings:
+      - schema:PropertyValue
+      - wikidata:Q43649390  # Wikidata identifier
+    
+    attributes:
+      qid:
+        range: string
+        required: true
+        pattern: "^Q[0-9]+$"
+        description: >-
+          The Wikidata Q-number (e.g., Q190804).
+          Must start with 'Q' followed by one or more digits.
+      
+      url:
+        range: uri
+        description: >-
+          Full URL to the Wikidata entity page.
+          Auto-derivable from qid: https://www.wikidata.org/wiki/{qid}
+      
+      label:
+        range: string
+        description: >-
+          Human-readable label for the entity (optional cache).
+          May be language-specific.
+      
+      retrieved_at:
+        range: datetime
+        description: >-
+          Timestamp when this identifier was retrieved/verified.
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: >-
+        Wikidata identifiers applicable to all custodian types.
+      custodian_types_primary: "*"
+      specificity_score: 0.3
+      specificity_rationale: >-
+        Low specificity - universal identifier type.
+    
+    examples:
+      - value: |
+          WikiDataIdentifier:
+            qid: "Q190804"
+            url: "https://www.wikidata.org/wiki/Q190804"
+            label: "Rijksmuseum"
+        description: Wikidata identifier for the Rijksmuseum.
+      
+      - value: |
+          WikiDataIdentifier:
+            qid: "Q1526131"
+            label: "Biblioteca Nacional do Brasil"
+        description: Wikidata identifier for the National Library of Brazil.

frontend/public/schemas/20251121/linkml/modules/classes/XPath.yaml

@@ -0,0 +1,101 @@
+# XPath - An XPath expression for locating elements in HTML/XML documents
+# Created per slot_fixes.yaml migration for: xpath
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/classes/XPath
+name: XPath
+title: XPath
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  prov: http://www.w3.org/ns/prov#
+  schema: http://schema.org/
+  xsd: http://www.w3.org/2001/XMLSchema#
+
+imports:
+  - linkml:types
+
+default_range: string
+
+classes:
+  XPath:
+    description: >-
+      An XPath expression used to locate a specific element within an HTML or XML document.
+      
+      **CRITICAL PROVENANCE FIELD**:
+      XPath expressions provide the essential link between extracted data values and their
+      original source location in archived documents. Without an XPath, a claim extracted
+      from a webpage is unverifiable.
+      
+      **FORMAT**: Standard XPath 1.0 expressions
+      **EXAMPLE**: `/html[1]/body[1]/div[6]/div[1]/table[3]/tbody[1]/tr[1]/td[1]/p[6]`
+      
+      **USAGE CONTEXT**:
+      Used with `has_or_had_provenance_path` slot to link provenance records to
+      specific locations in source documents.
+      
+    class_uri: prov:Location
+    
+    close_mappings:
+      - schema:xpath
+    
+    related_mappings:
+      - prov:atLocation
+    
+    attributes:
+      expression:
+        range: string
+        required: true
+        description: >-
+          The XPath expression string.
+          Example: /html[1]/body[1]/div[6]/div[1]/table[3]/tbody[1]/tr[1]/td[1]/p[6]
+        pattern: "^/.*"
+      
+      matched_text:
+        range: string
+        description: >-
+          The text content found at this XPath location.
+          Used for verification and debugging.
+      
+      match_score:
+        range: float
+        minimum_value: 0.0
+        maximum_value: 1.0
+        description: >-
+          Confidence score (0.0 to 1.0) for the XPath match.
+          1.0 = exact match, <1.0 = fuzzy match.
+      
+      source_document:
+        range: uriorcurie
+        description: >-
+          URI or path to the source document where this XPath applies.
+          Example: web/GHCID/example.org/rendered.html
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: >-
+        XPath provenance is relevant for any custodian type where web content
+        is extracted and archived.
+      custodian_types_primary: "*"
+      specificity_score: 0.7
+      specificity_rationale: >-
+        High specificity - only relevant for web-extracted data with HTML archival.
+    
+    examples:
+      - value: |
+          XPath:
+            expression: "/html[1]/body[1]/div[6]/div[1]/table[3]/tbody[1]/tr[1]/td[1]/p[6]"
+            matched_text: "Historische Vereniging Nijeveen"
+            match_score: 1.0
+            source_document: "web/0021/historischeverenigingnijeveen.nl/rendered.html"
+        description: >-
+          XPath extraction pointing to an institution name in archived HTML.
+      
+      - value: |
+          XPath:
+            expression: "//meta[@property='og:title']/@content"
+            matched_text: "Amsterdam Museum - Official Website"
+            match_score: 0.95
+        description: >-
+          XPath to OpenGraph metadata in a webpage header.

frontend/public/schemas/20251121/linkml/modules/enums/MeasureUnitEnum.yaml

@@ -111,6 +111,57 @@ enums:
           unit_type: length
           usage_context: storage_capacity
 
+      # Count units (Rule 53: link_branch migration for visitor_count, view_count)
+      VISITOR:
+        description: Visitor count unit - for attendance metrics
+        meaning: hc:VisitorUnit
+        annotations:
+          ucum_code: "1"
+          unit_type: count
+          usage_context: visitor_metrics
+      VIEW:
+        description: View count unit - for digital content metrics (videos, pages)
+        meaning: hc:ViewUnit
+        annotations:
+          ucum_code: "1"
+          unit_type: count
+          usage_context: digital_metrics
+      ITEM:
+        description: Item count unit - for collection object counts
+        meaning: hc:ItemUnit
+        annotations:
+          ucum_code: "1"
+          unit_type: count
+          usage_context: collection_metrics
+      FTE:
+        description: Full-time equivalent - for staff measurement
+        meaning: hc:FTEUnit
+        annotations:
+          ucum_code: "1"
+          unit_type: count
+          usage_context: staff_metrics
+      HEADCOUNT:
+        description: Headcount - total number of individuals
+        meaning: hc:HeadcountUnit
+        annotations:
+          ucum_code: "1"
+          unit_type: count
+          usage_context: staff_metrics
+      OBJECT:
+        description: Object count unit - for museum/archive object counts
+        meaning: hc:ObjectUnit
+        annotations:
+          ucum_code: "1"
+          unit_type: count
+          usage_context: collection_metrics
+      FACE:
+        description: Face count unit - for unique faces in photo collections
+        meaning: hc:FaceUnit
+        annotations:
+          ucum_code: "1"
+          unit_type: count
+          usage_context: digital_metrics
+
       # Unknown/unspecified
       UNKNOWN:
         description: Unit not specified or unknown

frontend/public/schemas/20251121/linkml/modules/enums/MethodologyTypeEnum.yaml

@@ -0,0 +1,82 @@
+id: https://nde.nl/ontology/hc/enum/MethodologyTypeEnum
+name: methodology_type_enum
+title: Methodology Type Enum
+description: >-
+  Enumeration of methodology types for measurement derivation.
+  
+  **RULE 53 COMPLIANT**: Created for unique_object_count and unique_face_count
+  migration per slot_fixes.yaml revision (lines 1951-1994).
+  
+  **SLOT_FIXES.YAML REFERENCE**:
+  
+  The revision specifies `value: entity_resolution` for both unique_object_count
+  and unique_face_count, indicating these counts are derived via entity resolution
+  (deduplication) methodologies.
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+
+imports:
+  - linkml:types
+
+default_prefix: hc
+
+enums:
+  MethodologyTypeEnum:
+    description: >-
+      Types of methodologies used to derive measurements or observations.
+      
+      **PRIMARY USE CASE**: Video annotation unique counts
+      
+      When counting unique objects or faces in video, different methodologies
+      produce different results. This enum captures the approach used.
+    permissible_values:
+      ENTITY_RESOLUTION:
+        description: >-
+          Deduplication via feature matching and clustering.
+          Used to count unique entities across multiple observations.
+          Example: Counting unique faces by clustering face embeddings.
+        annotations:
+          slot_fixes_value: entity_resolution
+          typical_use: unique_object_count, unique_face_count
+      
+      OBJECT_TRACKING:
+        description: >-
+          Multi-object tracking across video frames.
+          Maintains identity of objects as they move through scenes.
+          Example: DeepSORT, ByteTrack tracking algorithms.
+        annotations:
+          typical_use: video_object_annotation
+      
+      MANUAL_COUNT:
+        description: >-
+          Human manual counting or annotation.
+          May involve multiple reviewers for accuracy.
+        annotations:
+          typical_use: ground_truth_annotation
+      
+      STATISTICAL_SAMPLING:
+        description: >-
+          Count derived from statistical sampling methodology.
+          Extrapolated from sample to estimate total population.
+        annotations:
+          typical_use: visitor_estimates, large_collection_counts
+      
+      AUTOMATED_DETECTION:
+        description: >-
+          Automated detection without deduplication.
+          Raw detection counts that may include duplicates.
+        annotations:
+          typical_use: raw_detection_counts
+      
+      HYBRID:
+        description: >-
+          Combination of automated and manual methodologies.
+          Automated detection with manual verification/correction.
+        annotations:
+          typical_use: quality_assured_annotation
+      
+      UNKNOWN:
+        description: >-
+          Methodology not specified or unknown.

frontend/public/schemas/20251121/linkml/modules/slots/accepts_or_accepted.yaml

@@ -0,0 +1,67 @@
+# accepts_or_accepted - Generic slot for things an institution accepts
+# Created per slot_fixes.yaml migration for: accepts_or_accepted_external_work, 
+#   accepts_or_accepted_payment_method, accepts_or_accepted_visiting_scholar
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/slot/accepts_or_accepted
+name: accepts_or_accepted_slot
+title: Accepts Or Accepted Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+
+imports:
+  - linkml:types
+
+default_prefix: hc
+
+slots:
+  accepts_or_accepted:
+    description: >-
+      Generic slot for things an institution accepts or has accepted.
+      
+      **TEMPORAL SEMANTICS** (RiC-O style):
+      The "accepts_or_accepted" naming indicates policies can change:
+      - Payment methods may be added/removed
+      - External work acceptance policies change
+      - Visiting scholar programs may start/end
+      
+      **USE CASES**:
+      - Payment methods accepted (credit cards, cash, digital)
+      - External work (conservation, digitization contracts)
+      - Visiting scholars (research programs)
+      
+      **RANGE**:
+      This is a generic slot - use slot_usage in classes to constrain
+      the range to specific types (ExternalWork, PaymentMethod, VisitingScholar).
+      
+    range: string
+    slot_uri: schema:acceptedPaymentMethod
+    multivalued: true
+    
+    close_mappings:
+      - schema:acceptedPaymentMethod
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: >-
+        Acceptance policies applicable to various custodian types.
+      custodian_types_primary: "*"
+      specificity_score: 0.5
+      specificity_rationale: >-
+        Moderate specificity - depends on context of what is accepted.
+    
+    examples:
+      - value: |
+          accepts_or_accepted:
+            - "credit_card"
+            - "debit_card"
+            - "cash"
+        description: Payment methods accepted by institution.
+    
+    comments:
+      - Created from slot_fixes.yaml migration (2026-01-14)
+      - Generic slot for acceptance-related relationships
+      - Constrain range via slot_usage in specific classes

frontend/public/schemas/20251121/linkml/modules/slots/asserts_or_asserted.yaml

@@ -0,0 +1,70 @@
+# asserts_or_asserted - Links provenance to a hypothesis or assertion
+# Created per slot_fixes.yaml migration for: type_hypothesis
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/slot/asserts_or_asserted
+name: asserts_or_asserted_slot
+title: Asserts Or Asserted Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  prov: http://www.w3.org/ns/prov#
+  schema: http://schema.org/
+
+imports:
+  - linkml:types
+
+default_prefix: hc
+
+slots:
+  asserts_or_asserted:
+    description: >-
+      Links a provenance record to a hypothesis or assertion that it supports.
+      
+      **TEMPORAL SEMANTICS** (RiC-O style):
+      The "asserts_or_asserted" naming indicates that assertions can change:
+      - New evidence may modify or invalidate hypotheses
+      - Historical assertions preserved for audit trail
+      - Confidence levels may be updated over time
+      
+      **USAGE**:
+      Used within a Provenance class to link the provenance activity
+      to a specific Hypothesis about uncertain data.
+      
+      **EXAMPLE**:
+      A provenance record from web scraping asserts a hypothesis about
+      institution type based on evidence found on the website.
+      
+    range: Hypothesis
+    slot_uri: prov:generated
+    inlined: true
+    
+    exact_mappings:
+      - prov:generated
+    
+    close_mappings:
+      - schema:mainEntity
+    
+    annotations:
+      custodian_types: '["U"]'
+      custodian_types_rationale: >-
+        Assertions/hypotheses primarily relevant for Unknown type institutions.
+      custodian_types_primary: "U"
+      specificity_score: 0.8
+      specificity_rationale: >-
+        High specificity - only relevant for hypothesis tracking.
+    
+    examples:
+      - value: |
+          asserts_or_asserted:
+            asserted_value: "MUSEUM"
+            confidence_level: "medium"
+            supporting_evidence:
+              - "Website mentions 'permanent collection'"
+        description: Provenance asserting a museum type hypothesis.
+    
+    comments:
+      - Created from slot_fixes.yaml migration (2026-01-14)
+      - Replaces direct type_hypothesis slot usage
+      - Links Provenance class to Hypothesis class

frontend/public/schemas/20251121/linkml/modules/slots/begin_of_the_begin.yaml

@@ -1,13 +1,70 @@
+# begin_of_the_begin slot
+# Earliest possible start time of a temporal extent (CIDOC-CRM pattern)
+#
+# Generation date: 2026-01-15
+# Updated from datetime to Timestamp class per slot_fixes.yaml
+# Rule compliance: 38 (slot centralization + semantic URI), 39 (RiC-O naming), 53 (slot_fixes.yaml)
+
 id: https://nde.nl/ontology/hc/slot/begin_of_the_begin
 name: begin_of_the_begin_slot
+title: Begin of the Begin Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  time: http://www.w3.org/2006/time#
+  prov: http://www.w3.org/ns/prov#
+  schema: http://schema.org/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ./classes/Timestamp
+
 slots:
   begin_of_the_begin:
     slot_uri: crm:P82a_begin_of_the_begin
-    range: datetime
+    description: |
-    description: Earliest possible start time of temporal extent (CIDOC-CRM E52_Time-Span)
+      Earliest possible start time of temporal extent (CIDOC-CRM E52_Time-Span).
+      
+      **CIDOC-CRM Pattern**:
+      P82a defines the earliest possible time the time span could have started.
+      Used with P81a (end_of_the_begin) to express uncertainty about start time.
+      
+      **Example**: "Founded between 1800-1805"
+      - begin_of_the_begin: 1800-01-01 (earliest possible founding)
+      - end_of_the_begin: 1805-12-31 (latest possible founding)
+      
+      **Ontological Alignment**:
+      - **Primary** (`slot_uri`): `crm:P82a_begin_of_the_begin`
+      - **Related**: `prov:startedAtTime` - PROV-O activity start
+      - **Narrow**: `schema:startDate` - Schema.org start date
+      
+      **Range**: Timestamp class (per slot_fixes.yaml revision spec)
+      
+    range: Timestamp
+    inlined: true
+    required: false
+    multivalued: false
+    
+    exact_mappings:
+      - crm:P82a_begin_of_the_begin
+    
     related_mappings:
-    - prov:startedAtTime
+      - prov:startedAtTime
+    
     narrow_mappings:
-    - schema:startDate
+      - schema:startDate
-    broad_mappings:
+    
-    - dcterms:relation
+    annotations:
+      slot_fixes_compliance: "Range changed from datetime to Timestamp class per slot_fixes.yaml"
+      migration_date: "2026-01-15"
+      replaces_slots: "valid_from, valid_from_geo"
+    
+    examples:
+      - value: |
+          timestamp_value: "1800-01-01"
+          timestamp_precision: day
+        description: "Earliest possible founding date"

frontend/public/schemas/20251121/linkml/modules/slots/begin_of_the_end.yaml

@@ -1,11 +1,59 @@
+# begin_of_the_end slot
+# Earliest possible end time of a temporal extent (CIDOC-CRM pattern)
+#
+# Generation date: 2026-01-15
+# Updated from datetime to Timestamp class for consistency with other boundary slots
+# Rule compliance: 38 (slot centralization + semantic URI), 53 (slot_fixes.yaml)
+
 id: https://nde.nl/ontology/hc/slot/begin_of_the_end
 name: begin_of_the_end_slot
+title: Begin of the End Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  time: http://www.w3.org/2006/time#
+  prov: http://www.w3.org/ns/prov#
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ./classes/Timestamp
+
 slots:
   begin_of_the_end:
     slot_uri: crm:P81b_begin_of_the_end
-    range: datetime
+    description: |
-    description: Earliest possible end time of temporal extent (CIDOC-CRM E52_Time-Span)
+      Earliest possible end time of temporal extent (CIDOC-CRM E52_Time-Span).
+      
+      **CIDOC-CRM Pattern**:
+      P81b defines the earliest possible time the time span could have ended.
+      Used with P82b (end_of_the_end) to express uncertainty about end time.
+      
+      **Example**: "Closed between 1950-1955"
+      - begin_of_the_end: 1950-01-01 (earliest possible closure)
+      - end_of_the_end: 1955-12-31 (latest possible closure)
+      
+      **Range**: Timestamp class for precision tracking
+      
+    range: Timestamp
+    inlined: true
+    required: false
+    multivalued: false
+    
+    exact_mappings:
+      - crm:P81b_begin_of_the_end
+    
     related_mappings:
-    - prov:endedAtTime
+      - prov:endedAtTime
-    broad_mappings:
+    
-    - dcterms:relation
+    annotations:
+      migration_date: "2026-01-15"
+    
+    examples:
+      - value: |
+          timestamp_value: "1950-01-01"
+          timestamp_precision: day
+        description: "Earliest possible closure date"

frontend/public/schemas/20251121/linkml/modules/slots/calendar_system.yaml

@@ -0,0 +1,60 @@
+# calendar_system slot
+# The calendar system used for a timestamp
+#
+# Generation date: 2026-01-15
+# Rule compliance: 38 (slot centralization + semantic URI), 42 (no prefix), 43 (singular noun)
+
+id: https://nde.nl/ontology/hc/slot/calendar_system
+name: calendar_system_slot
+title: Calendar System Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  time: http://www.w3.org/2006/time#
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+
+slots:
+  calendar_system:
+    slot_uri: time:hasTRS
+    description: |
+      The calendar system for the timestamp.
+      
+      **Ontological Alignment**:
+      - **Primary** (`slot_uri`): `time:hasTRS` - OWL Time temporal reference system
+      
+      **Common Values**:
+      - gregorian: Standard Gregorian calendar (default)
+      - julian: Julian calendar (historical dates before 1582)
+      - hebrew: Hebrew calendar
+      - islamic: Islamic (Hijri) calendar
+      - chinese: Chinese calendar
+      - japanese: Japanese imperial calendar
+      
+      **Usage**:
+      Defaults to Gregorian if not specified. Important for:
+      - Historical documents dated before Gregorian adoption
+      - Non-Western heritage institutions
+      - Religious calendar dates
+      
+    range: string
+    required: false
+    multivalued: false
+    
+    exact_mappings:
+      - time:hasTRS
+    
+    annotations:
+      migration_date: "2026-01-15"
+    
+    examples:
+      - value: "gregorian"
+        description: "Standard Gregorian calendar"
+      - value: "julian"
+        description: "Julian calendar for pre-1582 dates"
+      - value: "islamic"
+        description: "Islamic/Hijri calendar"

frontend/public/schemas/20251121/linkml/modules/slots/description_text.yaml

@@ -0,0 +1,54 @@
+# description_text slot
+# The textual content of a description
+#
+# Generation date: 2026-01-15
+# Rule compliance: 38 (slot centralization + semantic URI), 42 (no prefix), 43 (singular noun)
+
+id: https://nde.nl/ontology/hc/slot/description_text
+name: description_text_slot
+title: Description Text Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  dcterms: http://purl.org/dc/terms/
+  rdf: http://www.w3.org/1999/02/22-rdf-syntax-ns#
+  rdfs: http://www.w3.org/2000/01/rdf-schema#
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+
+slots:
+  description_text:
+    slot_uri: rdf:value
+    description: |
+      The textual content of a description.
+      
+      **Ontological Alignment**:
+      - **Primary** (`slot_uri`): `rdf:value` - the principal value of a resource
+      - **Close**: `rdfs:label` - human-readable label
+      
+      **Usage**:
+      This slot holds the actual text of a Description instance.
+      The Description class provides structure (type, language) while
+      this slot holds the content.
+      
+    range: string
+    required: true
+    multivalued: false
+    
+    exact_mappings:
+      - rdf:value
+    
+    close_mappings:
+      - rdfs:label
+    
+    annotations:
+      replaces_slots: "binding_description, branch_description, etc. (text content)"
+      migration_date: "2026-01-15"
+    
+    examples:
+      - value: "Climate-controlled storage zone with dedicated HVAC."
+        description: "Zone description text"

frontend/public/schemas/20251121/linkml/modules/slots/description_type.yaml

@@ -0,0 +1,59 @@
+# description_type slot
+# The type/category of a description
+#
+# Generation date: 2026-01-15
+# Rule compliance: 38 (slot centralization + semantic URI), 42 (no prefix), 43 (singular noun)
+
+id: https://nde.nl/ontology/hc/slot/description_type
+name: description_type_slot
+title: Description Type Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  dcterms: http://purl.org/dc/terms/
+  rdf: http://www.w3.org/1999/02/22-rdf-syntax-ns#
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+
+slots:
+  description_type:
+    slot_uri: dcterms:type
+    description: |
+      The type or category of description.
+      
+      **Ontological Alignment**:
+      - **Primary** (`slot_uri`): `dcterms:type` - nature or genre of resource
+      
+      **Usage**:
+      Categorizes descriptions by their purpose:
+      - binding: Physical binding description
+      - branch: Organizational branch description
+      - budget: Budget/financial description
+      - zone: Storage zone description
+      - warehouse: Warehouse description
+      - unit: Organizational unit description
+      - type: Type/category definition
+      - general: General purpose description
+      
+    range: string
+    required: false
+    multivalued: false
+    
+    exact_mappings:
+      - dcterms:type
+    
+    annotations:
+      replaces_slots: "implicitly from slot names like binding_description -> type=binding"
+      migration_date: "2026-01-15"
+    
+    examples:
+      - value: "binding"
+        description: "Physical binding description type"
+      - value: "zone"
+        description: "Storage zone description type"
+      - value: "branch"
+        description: "Organizational branch description type"

frontend/public/schemas/20251121/linkml/modules/slots/end_of_the_begin.yaml

@@ -1,11 +1,59 @@
+# end_of_the_begin slot
+# Latest possible start time of a temporal extent (CIDOC-CRM pattern)
+#
+# Generation date: 2026-01-15
+# Updated from datetime to Timestamp class for consistency with other boundary slots
+# Rule compliance: 38 (slot centralization + semantic URI), 53 (slot_fixes.yaml)
+
 id: https://nde.nl/ontology/hc/slot/end_of_the_begin
 name: end_of_the_begin_slot
+title: End of the Begin Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  time: http://www.w3.org/2006/time#
+  prov: http://www.w3.org/ns/prov#
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ./classes/Timestamp
+
 slots:
   end_of_the_begin:
     slot_uri: crm:P81a_end_of_the_begin
-    range: datetime
+    description: |
-    description: Latest possible start time of temporal extent (CIDOC-CRM E52_Time-Span)
+      Latest possible start time of temporal extent (CIDOC-CRM E52_Time-Span).
+      
+      **CIDOC-CRM Pattern**:
+      P81a defines the latest possible time the time span could have started.
+      Used with P82a (begin_of_the_begin) to express uncertainty about start time.
+      
+      **Example**: "Founded between 1800-1805"
+      - begin_of_the_begin: 1800-01-01 (earliest possible founding)
+      - end_of_the_begin: 1805-12-31 (latest possible founding)
+      
+      **Range**: Timestamp class for precision tracking
+      
+    range: Timestamp
+    inlined: true
+    required: false
+    multivalued: false
+    
+    exact_mappings:
+      - crm:P81a_end_of_the_begin
+    
     related_mappings:
-    - prov:startedAtTime
+      - prov:startedAtTime
-    broad_mappings:
+    
-    - dcterms:relation
+    annotations:
+      migration_date: "2026-01-15"
+    
+    examples:
+      - value: |
+          timestamp_value: "1805-12-31"
+          timestamp_precision: day
+        description: "Latest possible founding date"

frontend/public/schemas/20251121/linkml/modules/slots/end_of_the_end.yaml

@@ -1,13 +1,70 @@
+# end_of_the_end slot
+# Latest possible end time of a temporal extent (CIDOC-CRM pattern)
+#
+# Generation date: 2026-01-15
+# Updated from datetime to Timestamp class per slot_fixes.yaml
+# Rule compliance: 38 (slot centralization + semantic URI), 39 (RiC-O naming), 53 (slot_fixes.yaml)
+
 id: https://nde.nl/ontology/hc/slot/end_of_the_end
 name: end_of_the_end_slot
+title: End of the End Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  time: http://www.w3.org/2006/time#
+  prov: http://www.w3.org/ns/prov#
+  schema: http://schema.org/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ./classes/Timestamp
+
 slots:
   end_of_the_end:
     slot_uri: crm:P82b_end_of_the_end
-    range: datetime
+    description: |
-    description: Latest possible end time of temporal extent (CIDOC-CRM E52_Time-Span)
+      Latest possible end time of temporal extent (CIDOC-CRM E52_Time-Span).
+      
+      **CIDOC-CRM Pattern**:
+      P82b defines the latest possible time the time span could have ended.
+      Used with P81b (begin_of_the_end) to express uncertainty about end time.
+      
+      **Example**: "Closed between 1950-1955"
+      - begin_of_the_end: 1950-01-01 (earliest possible closure)
+      - end_of_the_end: 1955-12-31 (latest possible closure)
+      
+      **Ontological Alignment**:
+      - **Primary** (`slot_uri`): `crm:P82b_end_of_the_end`
+      - **Related**: `prov:endedAtTime` - PROV-O activity end
+      - **Narrow**: `schema:endDate` - Schema.org end date
+      
+      **Range**: Timestamp class (per slot_fixes.yaml revision spec)
+      
+    range: Timestamp
+    inlined: true
+    required: false
+    multivalued: false
+    
+    exact_mappings:
+      - crm:P82b_end_of_the_end
+    
     related_mappings:
-    - prov:endedAtTime
+      - prov:endedAtTime
+    
     narrow_mappings:
-    - schema:endDate
+      - schema:endDate
-    broad_mappings:
+    
-    - dcterms:relation
+    annotations:
+      slot_fixes_compliance: "Range changed from datetime to Timestamp class per slot_fixes.yaml"
+      migration_date: "2026-01-15"
+      replaces_slots: "valid_to, valid_to_geo"
+    
+    examples:
+      - value: |
+          timestamp_value: "1955-12-31"
+          timestamp_precision: day
+        description: "Latest possible closure date"

frontend/public/schemas/20251121/linkml/modules/slots/ends_or_ended_at_location.yaml

@@ -0,0 +1,73 @@
+# ends_or_ended_at_location slot
+# Destination location relationship following RiC-O naming pattern
+#
+# Generation date: 2026-01-15
+# Rule compliance: 38 (slot centralization + semantic URI), 39 (RiC-O naming)
+#
+# Used by TransferEvent class for destination location
+
+id: https://nde.nl/ontology/hc/slot/ends_or_ended_at_location
+name: ends_or_ended_at_location_slot
+title: Ends Or Ended At Location Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  prov: http://www.w3.org/ns/prov#
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+
+slots:
+  ends_or_ended_at_location:
+    slot_uri: prov:atLocation
+    description: |
+      Destination location where an event or process ended.
+      
+      **Temporal Semantics** (RiC-O Pattern):
+      The "endsOrEnded" naming follows RiC-O convention indicating
+      the location may be historical (where something concluded).
+      
+      **Ontological Alignment**:
+      - **Primary** (`slot_uri`): `prov:atLocation` - PROV-O location
+      - **Related**: `crm:P26_moved_to` - CIDOC-CRM moved to
+      - **Related**: `schema:toLocation` - Schema.org destination
+      
+      **Use Cases**:
+      - Transfer event destination (where materials went to)
+      - Journey/movement end location
+      - Process completion location
+      
+      **Range**: Location class (structured location with name and coordinates)
+      
+    range: Location
+    required: false
+    multivalued: false
+    inlined: true
+    
+    related_mappings:
+      - crm:P26_moved_to
+      - schema:toLocation
+    
+    annotations:
+      rico_naming_convention: |
+        Follows RiC-O "endsOrEnded" pattern for temporal location predicates.
+        See Rule 39: Slot Naming Convention (RiC-O Style)
+      custodian_types: '["*"]'
+      custodian_types_rationale: Location relationships apply to all heritage types.
+      specificity_score: 0.4
+      specificity_rationale: Specialized slot for event/process locations.
+    
+    comments:
+      - "Destination location for events/processes"
+      - "Maps to prov:atLocation with end semantics"
+      - "RiC-O naming: endsOrEnded indicates temporal aspect"
+    
+    examples:
+      - value:
+          location_name: "New Archive Building, Haarlem"
+        description: "Destination location for collection transfer"

frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_code.yaml

@@ -0,0 +1,55 @@
+# has_or_had_code - Generic code/identifier slot
+#
+# Created per slot_fixes.yaml migration for: alpha_2, alpha_3
+# Creation date: 2026-01-14
+# Rule compliance: 39 (RiC-O naming), 50 (ontology mapping)
+
+id: https://nde.nl/ontology/hc/slot/has_or_had_code
+name: has_or_had_code
+title: Has or Had Code
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  skos: http://www.w3.org/2004/02/skos/core#
+  dct: http://purl.org/dc/terms/
+  schema: http://schema.org/
+
+default_prefix: hc
+
+slots:
+  has_or_had_code:
+    slot_uri: skos:notation
+    description: |
+      A code or notation value associated with an entity.
+      
+      **USAGE**:
+      Used for standardized codes such as:
+      - ISO 3166-1 alpha-2 country codes (e.g., "NL", "BE")
+      - ISO 3166-1 alpha-3 country codes (e.g., "NLD", "BEL")
+      - ISO 639-1/3 language codes
+      - Classification codes
+      
+      **ONTOLOGY ALIGNMENT**:
+      - slot_uri: skos:notation (SKOS notation for concepts)
+      
+    range: string
+    
+    exact_mappings:
+      - skos:notation
+    
+    close_mappings:
+      - dct:identifier
+      - schema:identifier
+    
+    examples:
+      - value: "NL"
+        description: ISO 3166-1 alpha-2 code for Netherlands
+      - value: "NLD"
+        description: ISO 3166-1 alpha-3 code for Netherlands
+      - value: "nld"
+        description: ISO 639-3 language code for Dutch
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: "Codes applicable to all custodian types."

frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_comment.yaml

@@ -0,0 +1,39 @@
+# has_or_had_comment - Comment association slot
+#
+# Created per slot_fixes.yaml migration for: video_comment
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/slot/has_or_had_comment
+name: has_or_had_comment
+title: Has or Had Comment
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+
+default_prefix: hc
+
+slots:
+  has_or_had_comment:
+    slot_uri: schema:comment
+    description: |
+      A comment associated with an entity.
+      
+      **USAGE**:
+      Used for:
+      - Video comments
+      - Review comments
+      - Annotation notes
+      
+    range: Comment
+    multivalued: true
+    
+    exact_mappings:
+      - schema:comment
+    
+    examples:
+      - value:
+          comment_text: "Great video about the collection!"
+          comment_author: "Visitor123"
+        description: User comment on video

frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_conversion_rate.yaml

@@ -0,0 +1,98 @@
+# has_or_had_conversion_rate - Links to a ConversionRate instance
+# Created per slot_fixes.yaml migration for: visitor_conversion_rate
+# Creation date: 2026-01-14
+#
+# REVISION FROM slot_fixes.yaml (lines 1646-1669):
+#   - label: has_or_had_conversion_rate (slot) ← THIS FILE
+#   - label: ConversionRate (class)
+#   - link_branch 1: has_or_had_type → ConversionRateType
+#   - link_branch 2: temporal_extent → TimeSpan
+
+id: https://nde.nl/ontology/hc/slot/has_or_had_conversion_rate
+name: has_or_had_conversion_rate_slot
+title: Has Or Had Conversion Rate Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+
+imports:
+  - linkml:types
+
+default_prefix: hc
+
+slots:
+  has_or_had_conversion_rate:
+    description: >-
+      Links to a ConversionRate instance representing a behavioral conversion metric.
+      
+      **TEMPORAL SEMANTICS** (RiC-O style):
+      The "has_or_had" naming indicates that conversion rates change over time:
+      - Rates vary by season (summer vs. winter)
+      - Rates change with exhibitions (blockbuster vs. permanent)
+      - Rates evolve with strategy (before/after membership drives)
+      
+      **REPLACES**: `visitor_conversion_rate` (float slot)
+      
+      **IMPROVEMENT OVER FLOAT**:
+      - Typed conversions (visitor-to-purchase, visitor-to-member, etc.)
+      - Temporal context (measurement period)
+      - Sample size for statistical validity
+      - Industry benchmark comparisons
+      
+      **USE CASES**:
+      - Gift shop performance tracking
+      - Membership conversion analytics
+      - Digital engagement metrics
+      - Marketing campaign effectiveness
+      
+    range: ConversionRate
+    slot_uri: schema:interactionStatistic
+    inlined: true
+    multivalued: true
+    
+    exact_mappings:
+      - schema:interactionStatistic
+    
+    close_mappings:
+      - schema:QuantitativeValue
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: >-
+        Conversion rate metrics applicable to all custodian types with retail or engagement.
+      custodian_types_primary: "*"
+      specificity_score: 0.45
+      specificity_rationale: >-
+        Moderate specificity - relevant to custodians tracking performance metrics.
+    
+    examples:
+      - value: |
+          has_or_had_conversion_rate:
+            - rate_value: 0.35
+              rate_percentage: 35.0
+              has_or_had_type:
+                type_label: "Visitor to Purchase"
+              temporal_extent:
+                begin_of_the_begin: "2024-01-01"
+                end_of_the_end: "2024-12-31"
+              measurement_period_description: "Calendar Year 2024"
+        description: Gift shop with 35% visitor-to-purchase conversion.
+      
+      - value: |
+          has_or_had_conversion_rate:
+            - rate_value: 0.05
+              has_or_had_type:
+                type_label: "Visitor to Member"
+              temporal_extent:
+                begin_of_the_begin: "2024-06-01"
+                end_of_the_end: "2024-08-31"
+              measurement_period_description: "Summer membership drive"
+        description: 5% visitor-to-member conversion during summer campaign.
+    
+    comments:
+      - Created from slot_fixes.yaml migration (2026-01-14)
+      - Replaces simple float visitor_conversion_rate slot
+      - Supports multiple conversion types and time periods
+      - Multivalued to track different conversion types simultaneously

frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_description.yaml

@@ -5,7 +5,8 @@
 # for temporal relationships in heritage domain.
 #
 # Generation date: 2026-01-13
-# Rule compliance: 38 (slot centralization + semantic URI), 39 (RiC-O naming), 42 (no prefix)
+# Updated: 2026-01-15 - Changed range from string to Description class per slot_fixes.yaml
+# Rule compliance: 38 (slot centralization + semantic URI), 39 (RiC-O naming), 42 (no prefix), 53 (slot_fixes.yaml)
 
 id: https://nde.nl/ontology/hc/slot/has_or_had_description
 name: has_or_had_description_slot
@@ -22,6 +23,7 @@ default_prefix: hc
 
 imports:
   - linkml:types
+  - ./classes/Description
 
 slots:
   has_or_had_description:
@@ -43,9 +45,13 @@ slots:
       For Type classes, this provides a formal definition of the type.
       For instance classes, this provides a description of the specific entity.
       
-    range: string
+      **Range**: Description class (per slot_fixes.yaml revision spec)
+      The Description class provides typed descriptions with language support.
+      
+    range: Description
+    inlined: true
     required: false
-    multivalued: false
+    multivalued: true
     
     exact_mappings:
       - skos:definition
@@ -60,18 +66,28 @@ slots:
       rico_naming_convention: |
         Follows RiC-O "hasOrHad" pattern for temporal predicates.
         See Rule 39: Slot Naming Convention (RiC-O Style)
-      replaces_slots: "storage_type_description"
+      replaces_slots: >-
-      migration_date: "2026-01-13"
+        binding_description, branch_description, branch_office_description,
+        budget_description, zone_description, warehouse_description,
+        unit_description, type_description, storage_type_description
+      migration_date: "2026-01-15"
+      slot_fixes_compliance: "Range changed from string to Description class per slot_fixes.yaml"
     
     comments:
       - "Generic description slot for type classes and entities"
       - "Maps to skos:definition for formal type definitions"
       - "Maps to dcterms:description for instance descriptions"
       - "RiC-O naming: hasOrHad indicates potentially historical relationship"
+      - "Range: Description class with type, text, and language fields"
     
     examples:
       - value: |
-          Specialized climate-controlled facility for archival documents,
+          description_text: "Specialized climate-controlled facility for archival documents."
-          manuscripts, and records. Maintains stable temperature and 
+          description_type: zone
-          humidity optimal for paper and parchment preservation.
+          language: en
-        description: "Description of archive depot storage type"
+        description: "Zone description using Description class"
+      - value: |
+          description_text: "Quarter leather binding with marbled boards."
+          description_type: binding
+          language: en
+        description: "Binding description using Description class"

frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_facility.yaml

@@ -0,0 +1,39 @@
+# has_or_had_facility - Facility association slot
+#
+# Created per slot_fixes.yaml migration for: visitor_facility
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/slot/has_or_had_facility
+name: has_or_had_facility
+title: Has or Had Facility
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+
+default_prefix: hc
+
+slots:
+  has_or_had_facility:
+    slot_uri: schema:amenityFeature
+    description: |
+      A facility or amenity associated with an entity.
+      
+      **USAGE**:
+      Used for:
+      - Visitor facilities (café, shop, parking)
+      - Research facilities (reading room, lab)
+      - Accessibility facilities (wheelchair access)
+      
+    range: Facility
+    multivalued: true
+    
+    exact_mappings:
+      - schema:amenityFeature
+    
+    examples:
+      - value:
+          facility_name: "Museum Café"
+          facility_type: FOOD_SERVICE
+        description: On-site café facility

frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_format.yaml

@@ -0,0 +1,54 @@
+# has_or_had_format - Format specification slot
+#
+# Created per slot_fixes.yaml migration for: typical_response_formats, transcript_format
+# Creation date: 2026-01-14
+# Rule compliance: 39 (RiC-O naming), 50 (ontology mapping)
+
+id: https://nde.nl/ontology/hc/slot/has_or_had_format
+name: has_or_had_format
+title: Has or Had Format
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  dct: http://purl.org/dc/terms/
+  schema: http://schema.org/
+
+default_prefix: hc
+
+slots:
+  has_or_had_format:
+    slot_uri: dct:format
+    description: |
+      The format or file type of a resource or service response.
+      
+      **USAGE**:
+      Used for:
+      - Response formats from APIs (JSON, XML, RDF)
+      - File formats for documents (PDF, DOCX, TXT)
+      - Media formats (JPEG, MP3, MP4)
+      - Transcript formats (VTT, SRT, plain text)
+      
+      **ONTOLOGY ALIGNMENT**:
+      - slot_uri: dct:format (Dublin Core format)
+      
+    range: string
+    multivalued: true
+    
+    exact_mappings:
+      - dct:format
+    
+    close_mappings:
+      - schema:encodingFormat
+    
+    examples:
+      - value: "application/json"
+        description: JSON MIME type for API responses
+      - value: "text/vtt"
+        description: WebVTT subtitle/transcript format
+      - value: "image/jpeg"
+        description: JPEG image format
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: "Format specifications applicable to all custodian types."

frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_frequency.yaml

@@ -0,0 +1,103 @@
+# has_or_had_frequency - Links to an UpdateFrequency instance
+# Created per slot_fixes.yaml migration for: update_frequency
+# Creation date: 2026-01-14
+#
+# REVISION FROM slot_fixes.yaml (lines 1893-1910):
+#   - label: has_or_had_frequency (slot) ← THIS FILE
+#   - label: UpdateFrequency (class)
+#   - link_branch 1: has_or_had_quantity → Quantity
+#   - link_branch 2: has_or_had_time_interval → TimeInterval
+
+id: https://nde.nl/ontology/hc/slot/has_or_had_frequency
+name: has_or_had_frequency_slot
+title: Has Or Had Frequency Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  dcterms: http://purl.org/dc/terms/
+  dcat: http://www.w3.org/ns/dcat#
+  schema: http://schema.org/
+
+imports:
+  - linkml:types
+
+default_prefix: hc
+
+slots:
+  has_or_had_frequency:
+    description: >-
+      Links to an UpdateFrequency instance representing how often updates occur.
+      
+      **TEMPORAL SEMANTICS** (RiC-O style):
+      The "has_or_had" naming indicates that frequency can change over time:
+      - IoT sensors may be reconfigured to different update rates
+      - Data feeds may change from hourly to real-time
+      - Systems may be optimized to reduce update frequency
+      
+      **REPLACES**: `update_frequency` (string slot)
+      
+      **IMPROVEMENT OVER STRING**:
+      - Structured quantity (numeric value)
+      - Structured time interval (ISO 8601 duration)
+      - Event-driven vs time-based distinction
+      - Machine-readable for analytics
+      
+      **USE CASES**:
+      - IoT devices: Sensor update rates
+      - Data feeds: Sync frequencies
+      - APIs: Rate limiting and polling intervals
+      
+    range: UpdateFrequency
+    slot_uri: dcterms:accrualPeriodicity
+    inlined: true
+    
+    exact_mappings:
+      - dcterms:accrualPeriodicity
+    
+    close_mappings:
+      - dcat:frequency
+      - schema:repeatFrequency
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: >-
+        Frequency associations applicable to all custodian types with digital systems.
+      custodian_types_primary: "*"
+      specificity_score: 0.35
+      specificity_rationale: >-
+        Moderate specificity - relevant to custodians with IoT/data infrastructure.
+    
+    examples:
+      - value: |
+          has_or_had_frequency:
+            frequency_description: "Every 5 minutes"
+            has_or_had_quantity:
+              numeric_value: 5
+            has_or_had_time_interval:
+              duration_value: "PT1M"
+              duration_description: "minute"
+        description: Climate sensor with 5-minute update frequency.
+      
+      - value: |
+          has_or_had_frequency:
+            frequency_description: "On proximity trigger"
+            is_event_driven: true
+            trigger_type: "proximity"
+        description: Event-driven beacon updates.
+      
+      - value: |
+          has_or_had_frequency:
+            frequency_description: "Daily"
+            has_or_had_quantity:
+              numeric_value: 1
+            has_or_had_time_interval:
+              duration_value: "P1D"
+              duration_description: "daily"
+        description: Daily data synchronization.
+    
+    comments:
+      - Created from slot_fixes.yaml migration (2026-01-14)
+      - Replaces string-based update_frequency slot
+      - Uses Dublin Core accrualPeriodicity for semantic alignment
+      - Supports structured frequency representation

frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_measurement_unit.yaml

@@ -0,0 +1,55 @@
+id: https://nde.nl/ontology/hc/slot/has_or_had_measurement_unit
+name: has_or_had_measurement_unit_slot
+title: Has Or Had Measurement Unit Slot
+description: >-
+  Slot file for has_or_had_measurement_unit following Rule 53 (slot_fixes.yaml).
+  
+  **RULE 53 COMPLIANT**: Created as part of link_branch migration for visitor_count,
+  view_count, and similar quantity-based slots.
+  
+  **ONTOLOGY ALIGNMENT**:
+  - QUDT: qudt:unit - "The unit of measure used to express the value of a Quantity"
+  - Schema.org: schema:unitCode (close mapping)
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  qudt: http://qudt.org/schema/qudt/
+  schema: http://schema.org/
+
+imports:
+  - linkml:types
+
+default_prefix: hc
+
+slots:
+  has_or_had_measurement_unit:
+    description: >-
+      The unit of measurement for a quantity value. Uses RiC-O temporal
+      naming pattern to indicate the unit may be current or historical
+      (e.g., if measurement standards changed over time).
+      
+      **QUDT**: qudt:unit - "The unit of measure used to express the value
+      of a Quantity."
+      
+      **USE CASES**:
+      - Visitor counts: unit = "visitors", "visitors/year"
+      - View counts: unit = "views", "views/day"
+      - Collection sizes: unit = "items", "objects", "linear meters"
+      - Area: unit = "m²", "ha", "km²"
+      - Currency: unit = "EUR", "USD", "GBP"
+    range: MeasureUnit
+    slot_uri: qudt:unit
+    exact_mappings:
+      - qudt:unit
+    close_mappings:
+      - schema:unitCode
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: >-
+        Measurement units applicable to all heritage custodian types.
+      custodian_types_primary: M
+      specificity_score: 0.25
+      specificity_rationale: >-
+        Foundational slot for measurement data - highly reusable across
+        many quantity types (visitors, views, items, area, currency).

frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_methodology.yaml

@@ -0,0 +1,59 @@
+id: https://nde.nl/ontology/hc/slot/has_or_had_methodology
+name: has_or_had_methodology_slot
+title: Has Or Had Methodology Slot
+description: >-
+  RiC-O style slot for linking to methodology specifications.
+  
+  **RULE 53 COMPLIANT**: Created for unique_object_count and unique_face_count
+  migration per slot_fixes.yaml revision (lines 1951-1994).
+  
+  **RULE 39 COMPLIANT**: RiC-O style temporal naming (has_or_had_*).
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  prov: http://www.w3.org/ns/prov#
+
+imports:
+  - linkml:types
+
+default_prefix: hc
+
+slots:
+  has_or_had_methodology:
+    description: >-
+      The methodology used to derive a measurement or observation.
+      
+      **PROV-O ALIGNMENT**:
+      
+      Maps to `prov:hadPlan` which indicates "The optional Plan adopted by an Agent
+      in Association with some Activity."
+      
+      **WHY THIS MATTERS**:
+      
+      A "unique face count" of 15 has different meanings depending on methodology:
+      - ENTITY_RESOLUTION: 15 distinct individuals identified via face clustering
+      - OBJECT_TRACKING: 15 tracked face instances (may include same person)
+      - MANUAL_COUNT: 15 faces counted by human annotator
+      
+      **EXAMPLE USAGE**:
+      
+      ```yaml
+      has_or_had_quantity:
+        quantity_value: 15
+        quantity_type: OBJECT_COUNT
+        has_or_had_measurement_unit:
+          unit_type: FACE
+        has_or_had_methodology:
+          methodology_type: ENTITY_RESOLUTION
+          has_or_had_label: "ArcFace clustering"
+          confidence_threshold: 0.6
+      ```
+    range: Methodology
+    slot_uri: prov:hadPlan
+    exact_mappings:
+      - prov:hadPlan
+    annotations:
+      rule_53_compliant: true
+      link_branch: 2
+      migration_source: unique_object_count, unique_face_count

frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_opening_hour.yaml

@@ -0,0 +1,40 @@
+# has_or_had_opening_hour - Opening hours slot
+#
+# Created per slot_fixes.yaml migration for: visiting_hour
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/slot/has_or_had_opening_hour
+name: has_or_had_opening_hour
+title: Has or Had Opening Hour
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+
+default_prefix: hc
+
+slots:
+  has_or_had_opening_hour:
+    slot_uri: schema:openingHoursSpecification
+    description: |
+      Opening hours specification for an entity.
+      
+      **USAGE**:
+      Used for:
+      - Visiting hours
+      - Research room hours
+      - Service availability
+      
+    range: OpeningHour
+    multivalued: true
+    
+    exact_mappings:
+      - schema:openingHoursSpecification
+    
+    examples:
+      - value:
+          day_of_week: "Monday"
+          opens: "10:00"
+          closes: "17:00"
+        description: Monday opening hours

frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_policy.yaml

@@ -0,0 +1,77 @@
+# has_or_had_policy slot
+# Policy association following RiC-O naming pattern
+#
+# Generation date: 2026-01-15
+# Rule compliance: 38 (slot centralization + semantic URI), 39 (RiC-O naming), 53 (slot_fixes.yaml)
+#
+# Used by TransferEvent class for governing policy
+
+id: https://nde.nl/ontology/hc/slot/has_or_had_policy
+name: has_or_had_policy_slot
+title: Has Or Had Policy Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  odrl: http://www.w3.org/ns/odrl/2/
+  dcterms: http://purl.org/dc/terms/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+
+slots:
+  has_or_had_policy:
+    slot_uri: odrl:hasPolicy
+    description: |
+      Policy that governs or governed an activity or entity.
+      
+      **Temporal Semantics** (RiC-O Pattern):
+      The "hasOrHad" naming follows RiC-O convention indicating
+      the policy association may be historical.
+      
+      **Ontological Alignment**:
+      - **Primary** (`slot_uri`): `odrl:hasPolicy` - ODRL policy association
+      - **Related**: `dcterms:accessRights` - Dublin Core access rights
+      
+      **Use Cases**:
+      - Transfer policies governing custody changes
+      - Access policies for collections
+      - Retention policies for archives
+      
+      **Range**: TransferPolicy (or other policy classes)
+      
+      **Cardinality**:
+      Multivalued - entities may be governed by multiple policies.
+      
+    range: TransferPolicy
+    required: false
+    multivalued: true
+    inlined: true
+    inlined_as_list: true
+    
+    related_mappings:
+      - dcterms:accessRights
+    
+    annotations:
+      rico_naming_convention: |
+        Follows RiC-O "hasOrHad" pattern for temporal predicates.
+        See Rule 39: Slot Naming Convention (RiC-O Style)
+      replaces_slots: "transfer_policy"
+      migration_date: "2026-01-15"
+      custodian_types: '["*"]'
+      custodian_types_rationale: Policy associations apply to all heritage types.
+      specificity_score: 0.45
+      specificity_rationale: Specialized slot for policy governance.
+    
+    comments:
+      - "Links entities to governing policies"
+      - "Maps to odrl:hasPolicy for rights/rules"
+      - "RiC-O naming: hasOrHad indicates potentially historical"
+    
+    examples:
+      - value:
+          policy_name: "Donor Transfer Restriction"
+          policy_text: "Materials may not be transferred without donor consent."
+        description: "Transfer policy for collection"

frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_program.yaml

@@ -0,0 +1,39 @@
+# has_or_had_program - Program association slot
+#
+# Created per slot_fixes.yaml migration for: volunteer_program
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/slot/has_or_had_program
+name: has_or_had_program
+title: Has or Had Program
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+
+default_prefix: hc
+
+slots:
+  has_or_had_program:
+    slot_uri: schema:event
+    description: |
+      A program or initiative associated with an entity.
+      
+      **USAGE**:
+      Used for:
+      - Volunteer programs
+      - Educational programs
+      - Outreach initiatives
+      
+    range: Program
+    multivalued: true
+    
+    close_mappings:
+      - schema:event
+    
+    examples:
+      - value:
+          program_name: "Heritage Volunteer Program"
+          program_type: VOLUNTEER
+        description: Volunteer program at institution

frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_provenance_path.yaml

@@ -0,0 +1,67 @@
+# has_or_had_provenance_path - Links provenance to a specific location path (XPath, JSONPath, etc.)
+# Created per slot_fixes.yaml migration for: xpath
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/slot/has_or_had_provenance_path
+name: has_or_had_provenance_path_slot
+title: Has Or Had Provenance Path Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  prov: http://www.w3.org/ns/prov#
+
+imports:
+  - linkml:types
+
+default_prefix: hc
+
+slots:
+  has_or_had_provenance_path:
+    description: >-
+      Links a provenance record to a specific path expression that identifies
+      the location of the source data within a document.
+      
+      **TEMPORAL SEMANTICS** (RiC-O style):
+      The "has_or_had" naming indicates that path associations can change:
+      - Document structure may change, invalidating old paths
+      - Multiple paths may point to same data over time
+      - Historical paths preserved for audit trail
+      
+      **PATH TYPES**:
+      - XPath: For HTML/XML documents
+      - JSONPath: For JSON documents
+      - CSS Selector: For web scraping
+      
+      **USAGE**:
+      Typically used within a Provenance class to link the provenance activity
+      to the specific document location from which data was extracted.
+      
+    range: XPath
+    slot_uri: prov:atLocation
+    inlined: true
+    
+    exact_mappings:
+      - prov:atLocation
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: >-
+        Provenance path tracking applicable wherever document extraction occurs.
+      custodian_types_primary: "*"
+      specificity_score: 0.7
+      specificity_rationale: >-
+        High specificity - only relevant for document-based provenance tracking.
+    
+    examples:
+      - value: |
+          has_or_had_provenance_path:
+            expression: "/html[1]/body[1]/div[3]/h1"
+            matched_text: "Museum Name"
+            match_score: 1.0
+        description: Provenance path pointing to an H1 element in HTML.
+    
+    comments:
+      - Created from slot_fixes.yaml migration (2026-01-14)
+      - Replaces direct xpath slot usage with structured path object
+      - Links Provenance class to XPath class

frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_rationale.yaml

@@ -0,0 +1,40 @@
+# has_or_had_rationale - Rationale/explanation slot
+#
+# Created per slot_fixes.yaml migration for: wikidata_mapping_rationale
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/slot/has_or_had_rationale
+name: has_or_had_rationale
+title: Has or Had Rationale
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  skos: http://www.w3.org/2004/02/skos/core#
+  prov: http://www.w3.org/ns/prov#
+
+default_prefix: hc
+
+slots:
+  has_or_had_rationale:
+    slot_uri: skos:note
+    description: |
+      The rationale or justification for a decision or mapping.
+      
+      **USAGE**:
+      Used for:
+      - Mapping rationale (why an entity was mapped to Wikidata)
+      - Decision justifications
+      - Explanation notes
+      
+    range: string
+    
+    exact_mappings:
+      - skos:note
+    
+    close_mappings:
+      - prov:wasInfluencedBy
+    
+    examples:
+      - value: "Mapped to Q123456 based on exact name match and location verification"
+        description: Wikidata mapping rationale

frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_restriction.yaml

@@ -0,0 +1,40 @@
+# has_or_had_restriction - Restriction information slot
+#
+# Created per slot_fixes.yaml migration for: years_restricted
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/slot/has_or_had_restriction
+name: has_or_had_restriction
+title: Has or Had Restriction
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  dct: http://purl.org/dc/terms/
+
+default_prefix: hc
+
+slots:
+  has_or_had_restriction:
+    slot_uri: schema:accessibilityControl
+    description: |
+      Access or use restrictions associated with an entity.
+      
+      **USAGE**:
+      Used for:
+      - Years restricted (embargo periods)
+      - Access restrictions
+      - Use limitations
+      
+    range: Restriction
+    multivalued: true
+    
+    close_mappings:
+      - dct:accessRights
+    
+    examples:
+      - value:
+          restriction_type: EMBARGO
+          years: 25
+        description: 25-year embargo restriction

frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_scope.yaml

@@ -0,0 +1,67 @@
+# has_or_had_scope - Links to scope/coverage information
+# Created per slot_fixes.yaml migration for: typical_scope, type_scope
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/slot/has_or_had_scope
+name: has_or_had_scope_slot
+title: Has Or Had Scope Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  dct: http://purl.org/dc/terms/
+
+imports:
+  - linkml:types
+
+default_prefix: hc
+
+slots:
+  has_or_had_scope:
+    description: >-
+      Links to scope or coverage information for a collection, service, or institution.
+      
+      **TEMPORAL SEMANTICS** (RiC-O style):
+      The "has_or_had" naming indicates scope can change:
+      - Collections grow or shrink over time
+      - Service coverage may expand or contract
+      - Geographic scope may shift
+      
+      **USE CASES**:
+      - Collection scope (subject areas, time periods, geographic coverage)
+      - Service scope (types of materials handled)
+      - Institutional scope (mandate, mission coverage)
+      
+    range: Scope
+    slot_uri: dct:coverage
+    inlined: true
+    
+    exact_mappings:
+      - dct:coverage
+    
+    close_mappings:
+      - schema:spatialCoverage
+      - schema:temporalCoverage
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: >-
+        Scope information applicable to all custodian types.
+      custodian_types_primary: "*"
+      specificity_score: 0.3
+      specificity_rationale: >-
+        Low-moderate specificity - common metadata concept.
+    
+    examples:
+      - value: |
+          has_or_had_scope:
+            scope_description: "Dutch heritage from 1600-1900"
+            has_or_had_type:
+              type_name: "temporal"
+        description: Temporal scope for a collection.
+    
+    comments:
+      - Created from slot_fixes.yaml migration (2026-01-14)
+      - Replaces typical_scope and type_scope slots
+      - Uses Dublin Core coverage semantics

frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_score.yaml

@@ -0,0 +1,39 @@
+# has_or_had_score - Numeric score slot
+#
+# Created per slot_fixes.yaml migration for: xpath_match_score
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/slot/has_or_had_score
+name: has_or_had_score
+title: Has or Had Score
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+
+default_prefix: hc
+
+slots:
+  has_or_had_score:
+    slot_uri: schema:ratingValue
+    description: |
+      A numeric score or rating value.
+      
+      **USAGE**:
+      Used for:
+      - XPath match confidence scores (0.0-1.0)
+      - Relevance scores
+      - Quality ratings
+      - Similarity scores
+      
+    range: float
+    
+    close_mappings:
+      - schema:ratingValue
+    
+    examples:
+      - value: 0.95
+        description: XPath match confidence score
+      - value: 4.5
+        description: Rating score

frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_security_level.yaml

@@ -0,0 +1,38 @@
+# has_or_had_security_level - Security level slot
+#
+# Created per slot_fixes.yaml migration for: warehouse_security_level
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/slot/has_or_had_security_level
+name: has_or_had_security_level
+title: Has or Had Security Level
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+
+default_prefix: hc
+
+slots:
+  has_or_had_security_level:
+    slot_uri: schema:securityScreening
+    description: |
+      Security classification or level of a resource or location.
+      
+      **USAGE**:
+      Used for:
+      - Warehouse security levels
+      - Document classification levels
+      - Access control tiers
+      
+    range: SecurityLevel
+    
+    close_mappings:
+      - schema:securityScreening
+    
+    examples:
+      - value:
+          level_code: "HIGH"
+          level_name: "High Security"
+        description: High security level designation

frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_service.yaml

@@ -0,0 +1,39 @@
+# has_or_had_service - Service association slot
+#
+# Created per slot_fixes.yaml migration for: visitor_service
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/slot/has_or_had_service
+name: has_or_had_service
+title: Has or Had Service
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+
+default_prefix: hc
+
+slots:
+  has_or_had_service:
+    slot_uri: schema:availableService
+    description: |
+      A service offered by an entity.
+      
+      **USAGE**:
+      Used for:
+      - Visitor services (guided tours, audio guides)
+      - Research services
+      - Conservation services
+      
+    range: Service
+    multivalued: true
+    
+    exact_mappings:
+      - schema:availableService
+    
+    examples:
+      - value:
+          service_name: "Guided Tours"
+          service_type: VISITOR
+        description: Guided tour service

frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_text.yaml

@@ -0,0 +1,36 @@
+# has_or_had_text - Text content slot
+#
+# Created per slot_fixes.yaml migration for: xpath_matched_text
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/slot/has_or_had_text
+name: has_or_had_text
+title: Has or Had Text
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+
+default_prefix: hc
+
+slots:
+  has_or_had_text:
+    slot_uri: schema:text
+    description: |
+      Text content associated with an entity.
+      
+      **USAGE**:
+      Used for:
+      - Matched text segments from XPath queries
+      - Text content of elements
+      - Extracted text strings
+      
+    range: string
+    
+    exact_mappings:
+      - schema:text
+    
+    examples:
+      - value: "The museum collection includes..."
+        description: Text extracted from webpage

frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_time_interval.yaml

@@ -0,0 +1,71 @@
+# has_or_had_time_interval - Links to a time interval/duration
+# Created per slot_fixes.yaml migration for: update_frequency, typical_approval_time, total_revenue
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/slot/has_or_had_time_interval
+name: has_or_had_time_interval_slot
+title: Has Or Had Time Interval Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  time: http://www.w3.org/2006/time#
+  schema: http://schema.org/
+
+imports:
+  - linkml:types
+
+default_prefix: hc
+
+slots:
+  has_or_had_time_interval:
+    description: >-
+      Links to a time interval or duration associated with this entity.
+      
+      **TEMPORAL SEMANTICS** (RiC-O style):
+      The "has_or_had" naming indicates that time interval associations can change:
+      - Update frequencies may be revised
+      - Approval times may change with policy updates
+      - Reporting periods may vary
+      
+      **USE CASES**:
+      - Update frequency: How often data is refreshed
+      - Approval time: Expected processing duration
+      - Reporting period: Time period for metrics/revenue
+      
+    range: TimeInterval
+    slot_uri: time:hasDuration
+    inlined: true
+    
+    exact_mappings:
+      - time:hasDuration
+    
+    close_mappings:
+      - schema:duration
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: >-
+        Time interval associations applicable to all custodian types.
+      custodian_types_primary: "*"
+      specificity_score: 0.25
+      specificity_rationale: >-
+        Low specificity - universal temporal relationship.
+    
+    examples:
+      - value: |
+          has_or_had_time_interval:
+            duration_value: "P7D"
+            duration_description: "weekly"
+        description: Weekly update interval.
+      
+      - value: |
+          has_or_had_time_interval:
+            duration_value: "P1Y"
+            duration_description: "annual reporting period"
+        description: Annual time interval for revenue reporting.
+    
+    comments:
+      - Created from slot_fixes.yaml migration (2026-01-14)
+      - Replaces string-based duration fields with structured TimeInterval
+      - Uses W3C Time Ontology for duration semantics

frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_url.yaml

@@ -0,0 +1,83 @@
+# has_or_had_url slot
+# URL association following RiC-O naming pattern
+#
+# Generation date: 2026-01-15
+# Rule compliance: 38 (slot centralization + semantic URI), 39 (RiC-O naming), 53 (slot_fixes.yaml)
+#
+# Supports migrations per slot_fixes.yaml:
+# - website → has_or_had_url + URL
+# - url → has_or_had_url + URL
+# - vendor_url → has_or_had_url + URL
+
+id: https://nde.nl/ontology/hc/slot/has_or_had_url
+name: has_or_had_url_slot
+title: Has Or Had URL Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  foaf: http://xmlns.com/foaf/0.1/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+
+slots:
+  has_or_had_url:
+    slot_uri: schema:url
+    description: |
+      URL associated with this entity.
+      
+      **Temporal Semantics** (RiC-O Pattern):
+      The "hasOrHad" naming follows RiC-O convention indicating this
+      URL may be historical - websites change over time.
+      
+      **Ontological Alignment**:
+      - **Primary** (`slot_uri`): `schema:url` - Schema.org URL
+      - **Exact**: `foaf:homepage` - FOAF homepage (for main websites)
+      
+      **Use Cases**:
+      - Institution websites (type: website)
+      - API endpoints (type: api)
+      - Vendor/supplier websites (type: vendor)
+      - Documentation links (type: documentation)
+      
+      **Range**: URL class (structured URL with type and metadata)
+      
+      **Cardinality**:
+      Multivalued - entities may have multiple URLs (different types).
+      
+    range: URL
+    required: false
+    multivalued: true
+    inlined: true
+    inlined_as_list: true
+    
+    exact_mappings:
+      - foaf:homepage
+    
+    annotations:
+      rico_naming_convention: |
+        Follows RiC-O "hasOrHad" pattern for temporal predicates.
+        See Rule 39: Slot Naming Convention (RiC-O Style)
+      replaces_slots: "website, url, vendor_url"
+      migration_date: "2026-01-15"
+      custodian_types: '["*"]'
+      custodian_types_rationale: URLs apply to all heritage custodian types.
+      specificity_score: 0.15
+      specificity_rationale: Generic URL slot applicable across all contexts.
+    
+    comments:
+      - "Generic URL association slot"
+      - "Maps to schema:url for web addresses"
+      - "Temporal: URLs may change over time"
+      - "RiC-O naming: hasOrHad indicates potentially historical"
+      - "Replaces website, url, vendor_url per slot_fixes.yaml"
+    
+    examples:
+      - value:
+          url_value: "https://www.rijksmuseum.nl/"
+          url_type: website
+        description: "Official website for Rijksmuseum"

frontend/public/schemas/20251121/linkml/modules/slots/has_or_had_writing_system.yaml

@@ -0,0 +1,38 @@
+# has_or_had_writing_system - Writing system slot
+#
+# Created per slot_fixes.yaml migration for: writing_system
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/slot/has_or_had_writing_system
+name: has_or_had_writing_system
+title: Has or Had Writing System
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+
+default_prefix: hc
+
+slots:
+  has_or_had_writing_system:
+    slot_uri: schema:inLanguage
+    description: |
+      The writing system or script used.
+      
+      **USAGE**:
+      Used for:
+      - Script type (Latin, Cyrillic, Arabic, etc.)
+      - Writing direction (LTR, RTL)
+      - Historical scripts (Cuneiform, Hieroglyphics)
+      
+    range: WritingSystem
+    
+    close_mappings:
+      - schema:inLanguage
+    
+    examples:
+      - value:
+          script_code: "Latn"
+          script_name: "Latin"
+        description: Latin writing system

frontend/public/schemas/20251121/linkml/modules/slots/is_or_was_derived_from.yaml

@@ -0,0 +1,39 @@
+# is_or_was_derived_from - Derivation relationship slot
+#
+# Created per slot_fixes.yaml migration for: was_derived_from
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/slot/is_or_was_derived_from
+name: is_or_was_derived_from
+title: Is or Was Derived From
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  prov: http://www.w3.org/ns/prov#
+
+default_prefix: hc
+
+slots:
+  is_or_was_derived_from:
+    slot_uri: prov:wasDerivedFrom
+    description: |
+      Links an entity to another entity from which it was derived.
+      
+      **USAGE**:
+      Used for:
+      - Linking derived datasets to source datasets
+      - Tracking data transformations
+      - Establishing provenance chains
+      
+      **ONTOLOGY ALIGNMENT**:
+      - slot_uri: prov:wasDerivedFrom (PROV-O derivation relationship)
+      
+    range: uriorcurie
+    
+    exact_mappings:
+      - prov:wasDerivedFrom
+    
+    examples:
+      - value: https://nde.nl/dataset/source-123
+        description: Source dataset this was derived from

frontend/public/schemas/20251121/linkml/modules/slots/is_or_was_equivalent_to.yaml

@@ -0,0 +1,88 @@
+# is_or_was_equivalent_to slot
+# Semantic equivalence relationship following RiC-O naming pattern
+#
+# Generation date: 2026-01-15
+# Rule compliance: 38 (slot centralization + semantic URI), 39 (RiC-O naming), 53 (slot_fixes.yaml)
+#
+# Supports migration: wikidata_equivalent → is_or_was_equivalent_to + WikiDataEntry
+
+id: https://nde.nl/ontology/hc/slot/is_or_was_equivalent_to
+name: is_or_was_equivalent_to_slot
+title: Is Or Was Equivalent To Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  skos: http://www.w3.org/2004/02/skos/core#
+  owl: http://www.w3.org/2002/07/owl#
+  schema: http://schema.org/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+
+slots:
+  is_or_was_equivalent_to:
+    slot_uri: skos:exactMatch
+    description: |
+      Semantic equivalence with another entity (typically Wikidata).
+      
+      **Temporal Semantics** (RiC-O Pattern):
+      The "isOrWas" naming follows RiC-O convention indicating this
+      equivalence may be historical - concepts may diverge over time.
+      
+      **Ontological Alignment**:
+      - **Primary** (`slot_uri`): `skos:exactMatch` - SKOS exact match
+        for semantic equivalence between concepts
+      - **Related**: `owl:sameAs` - OWL identity (stronger claim)
+      - **Related**: `schema:sameAs` - Schema.org identity
+      
+      **Distinction from is_or_was_related_to**:
+      - `is_or_was_equivalent_to`: Semantic identity (same concept)
+      - `is_or_was_related_to`: Associative (related but distinct)
+      
+      **Use Case**:
+      Links a heritage custodian type or concept to its Wikidata equivalent.
+      Example: Our "Museum" type is equivalent to Wikidata Q33506.
+      
+      **Cardinality**:
+      Multivalued - an entity may have equivalences in multiple systems.
+      
+    range: string
+    required: false
+    multivalued: true
+    inlined_as_list: true
+    
+    exact_mappings:
+      - skos:exactMatch
+    
+    related_mappings:
+      - owl:sameAs
+      - schema:sameAs
+    
+    annotations:
+      rico_naming_convention: |
+        Follows RiC-O "isOrWas" pattern for temporal predicates.
+        See Rule 39: Slot Naming Convention (RiC-O Style)
+      replaces_slots: "wikidata_equivalent"
+      migration_date: "2026-01-15"
+      custodian_types: '["*"]'
+      custodian_types_rationale: Equivalence mappings apply to all heritage types.
+      specificity_score: 0.25
+      specificity_rationale: Generic alignment slot for ontology interoperability.
+    
+    comments:
+      - "Maps to skos:exactMatch for semantic equivalence"
+      - "Stronger than is_or_was_related_to (associative)"
+      - "Weaker than owl:sameAs (doesn't claim absolute identity)"
+      - "RiC-O naming: isOrWas indicates potentially historical relationship"
+      - "Replaces wikidata_equivalent per slot_fixes.yaml"
+    
+    examples:
+      - value:
+          - "Q33506"
+        description: "Wikidata equivalence for museum concept"
+      - value:
+          - "Q166118"
+        description: "Wikidata equivalence for archive concept"

frontend/public/schemas/20251121/linkml/modules/slots/is_or_was_generated_by.yaml

@@ -0,0 +1,39 @@
+# is_or_was_generated_by - Generation relationship slot
+#
+# Created per slot_fixes.yaml migration for: was_generated_by
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/slot/is_or_was_generated_by
+name: is_or_was_generated_by
+title: Is or Was Generated By
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  prov: http://www.w3.org/ns/prov#
+
+default_prefix: hc
+
+slots:
+  is_or_was_generated_by:
+    slot_uri: prov:wasGeneratedBy
+    description: |
+      Links an entity to the activity that generated it.
+      
+      **USAGE**:
+      Used for:
+      - Linking records to generation activities
+      - Tracking automated processing
+      - Provenance chains
+      
+      **ONTOLOGY ALIGNMENT**:
+      - slot_uri: prov:wasGeneratedBy (PROV-O generation relationship)
+      
+    range: uriorcurie
+    
+    exact_mappings:
+      - prov:wasGeneratedBy
+    
+    examples:
+      - value: https://nde.nl/activity/import-2024
+        description: Activity that generated this record

frontend/public/schemas/20251121/linkml/modules/slots/is_or_was_instance_of.yaml

@@ -0,0 +1,96 @@
+# is_or_was_instance_of slot
+# Instance/type classification relationship following RiC-O naming pattern
+#
+# Generation date: 2026-01-15
+# Rule compliance: 38 (slot centralization + semantic URI), 39 (RiC-O naming), 53 (slot_fixes.yaml)
+#
+# Supports migrations:
+# - wikidata_class → is_or_was_instance_of + WikiDataEntry
+# - wikidata → is_or_was_instance_of + WikiDataEntry
+
+id: https://nde.nl/ontology/hc/slot/is_or_was_instance_of
+name: is_or_was_instance_of_slot
+title: Is Or Was Instance Of Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  rdf: http://www.w3.org/1999/02/22-rdf-syntax-ns#
+  wdt: http://www.wikidata.org/prop/direct/
+  schema: http://schema.org/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+
+slots:
+  is_or_was_instance_of:
+    slot_uri: rdf:type
+    description: |
+      Classification indicating entity is an instance of a type/class.
+      
+      **Temporal Semantics** (RiC-O Pattern):
+      The "isOrWas" naming follows RiC-O convention indicating this
+      classification may be historical - entities may change type over time.
+      
+      **Ontological Alignment**:
+      - **Primary** (`slot_uri`): `rdf:type` - RDF type assertion
+      - **Exact**: `wdt:P31` - Wikidata "instance of" property
+      - **Related**: `schema:additionalType` - Schema.org additional type
+      
+      **Distinction from other relationships**:
+      - `is_or_was_instance_of`: This entity IS A [type] (classification)
+      - `is_or_was_equivalent_to`: This entity EQUALS [concept] (equivalence)
+      - `is_or_was_related_to`: This entity RELATES TO [concept] (association)
+      
+      **Use Cases**:
+      - Heritage custodian classified as Wikidata type (Q33506 museum)
+      - Building classified as architectural type
+      - Collection classified as collection type
+      
+      **Heritage Example**:
+      Rijksmuseum (Q190804) is_or_was_instance_of museum (Q33506)
+      
+      **Cardinality**:
+      Multivalued - entities may have multiple classifications.
+      
+    range: string
+    required: false
+    multivalued: true
+    inlined_as_list: true
+    
+    exact_mappings:
+      - wdt:P31
+    
+    related_mappings:
+      - schema:additionalType
+    
+    annotations:
+      rico_naming_convention: |
+        Follows RiC-O "isOrWas" pattern for temporal predicates.
+        See Rule 39: Slot Naming Convention (RiC-O Style)
+      replaces_slots: "wikidata_class, wikidata"
+      migration_date: "2026-01-15"
+      custodian_types: '["*"]'
+      custodian_types_rationale: Type classification applies to all heritage types.
+      specificity_score: 0.2
+      specificity_rationale: Generic classification slot used across all contexts.
+    
+    comments:
+      - "Maps to rdf:type for type/class assertion"
+      - "Wikidata equivalent: P31 (instance of)"
+      - "Temporal: institutions may change classification over time"
+      - "RiC-O naming: isOrWas indicates potentially historical relationship"
+      - "Replaces wikidata_class and wikidata per slot_fixes.yaml"
+    
+    examples:
+      - value:
+          - "Q33506"
+        description: "Instance of museum (Wikidata class)"
+      - value:
+          - "Q7075"
+        description: "Instance of library (Wikidata class)"
+      - value:
+          - "Q166118"
+        description: "Instance of archive (Wikidata class)"

frontend/public/schemas/20251121/linkml/modules/slots/is_or_was_located_within.yaml

@@ -0,0 +1,81 @@
+# is_or_was_located_within - Links an entity to a containing place
+# Created per slot_fixes.yaml migration for: within_place, within_auxiliary_place
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/slot/is_or_was_located_within
+name: is_or_was_located_within_slot
+title: Is Or Was Located Within Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  gn: http://www.geonames.org/ontology#
+
+imports:
+  - linkml:types
+
+default_prefix: hc
+
+slots:
+  is_or_was_located_within:
+    description: >-
+      Links an entity to a place that contains or contained it.
+      
+      **TEMPORAL SEMANTICS** (RiC-O style):
+      The "is_or_was" naming indicates that containment can change:
+      - Institutions may relocate to different cities
+      - Administrative boundaries may be redrawn
+      - Historical locations preserved for provenance
+      
+      **USE CASES**:
+      - Institution within a city/region
+      - Collection within a building/room
+      - Archive within an administrative area
+      
+      **REPLACES**:
+      - `within_place` (primary location containment)
+      - `within_auxiliary_place` (secondary location containment)
+      
+    range: Place
+    slot_uri: schema:containedInPlace
+    inlined: true
+    multivalued: true
+    
+    exact_mappings:
+      - schema:containedInPlace
+    
+    close_mappings:
+      - gn:parentFeature
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: >-
+        Location containment applicable to all custodian types.
+      custodian_types_primary: "*"
+      specificity_score: 0.2
+      specificity_rationale: >-
+        Low specificity - universal geographic relationship.
+    
+    examples:
+      - value: |
+          is_or_was_located_within:
+            - place_name: "Amsterdam"
+              place_type: "settlement"
+              geonames_id: 2759794
+        description: Institution located within Amsterdam.
+      
+      - value: |
+          is_or_was_located_within:
+            - place_name: "Noord-Holland"
+              place_type: "region"
+              iso_code: "NL-NH"
+            - place_name: "Netherlands"
+              place_type: "country"
+              iso_code: "NL"
+        description: Multiple containment levels for an institution.
+    
+    comments:
+      - Created from slot_fixes.yaml migration (2026-01-14)
+      - Replaces within_place and within_auxiliary_place slots
+      - Supports multiple containment relationships (multivalued)

frontend/public/schemas/20251121/linkml/modules/slots/is_or_was_managed_by.yaml

@@ -0,0 +1,38 @@
+# is_or_was_managed_by - Management relationship slot
+#
+# Created per slot_fixes.yaml migration for: warehouse_managed_by
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/slot/is_or_was_managed_by
+name: is_or_was_managed_by
+title: Is or Was Managed By
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  org: http://www.w3.org/ns/org#
+  schema: http://schema.org/
+
+default_prefix: hc
+
+slots:
+  is_or_was_managed_by:
+    slot_uri: org:hasMember
+    description: |
+      Links an entity to the group or organization that manages it.
+      
+      **USAGE**:
+      Used for:
+      - Warehouse management groups
+      - Team assignments
+      - Organizational responsibility
+      
+    range: uriorcurie
+    
+    close_mappings:
+      - org:hasMember
+      - schema:member
+    
+    examples:
+      - value: https://nde.nl/group/storage-team
+        description: Group managing a warehouse

frontend/public/schemas/20251121/linkml/modules/slots/is_or_was_related_to.yaml

@@ -4,8 +4,12 @@
 # Following RiC-O naming convention (Rule 39): "isOrWas..." pattern
 # for temporal relationships in heritage domain.
 #
-# Generation date: 2026-01-13
+# Generation date: 2026-01-13 (updated 2026-01-15)
-# Rule compliance: 38 (slot centralization + semantic URI), 39 (RiC-O naming), 42 (no prefix)
+# Rule compliance: 38 (slot centralization + semantic URI), 39 (RiC-O naming), 42 (no prefix), 53 (slot_fixes.yaml)
+#
+# Supports migrations per slot_fixes.yaml:
+# - wikidata_mapping → is_or_was_related_to + WikiDataEntry
+# - wikidata_alignment → is_or_was_related_to + WikiDataEntry
 
 id: https://nde.nl/ontology/hc/slot/is_or_was_related_to
 name: is_or_was_related_to_slot
@@ -68,8 +72,12 @@ slots:
       rico_naming_convention: |
         Follows RiC-O "isOrWas" pattern for temporal predicates.
         See Rule 39: Slot Naming Convention (RiC-O Style)
-      replaces_slots: "storage_type_related"
+      replaces_slots: "storage_type_related, wikidata_mapping, wikidata_alignment"
-      migration_date: "2026-01-13"
+      migration_date: "2026-01-15"
+      custodian_types: '["*"]'
+      custodian_types_rationale: Associative relationships apply to all heritage types.
+      specificity_score: 0.25
+      specificity_rationale: Generic relationship slot for non-hierarchical associations.
     
     comments:
       - "Generic association slot for non-hierarchical relationships"

frontend/public/schemas/20251121/linkml/modules/slots/is_or_was_revision_of.yaml

@@ -0,0 +1,39 @@
+# is_or_was_revision_of - Revision relationship slot
+#
+# Created per slot_fixes.yaml migration for: was_revision_of
+# Creation date: 2026-01-14
+
+id: https://nde.nl/ontology/hc/slot/is_or_was_revision_of
+name: is_or_was_revision_of
+title: Is or Was Revision Of
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  prov: http://www.w3.org/ns/prov#
+
+default_prefix: hc
+
+slots:
+  is_or_was_revision_of:
+    slot_uri: prov:wasRevisionOf
+    description: |
+      Links an entity to a previous version it revises.
+      
+      **USAGE**:
+      Used for:
+      - Document revisions
+      - Record updates
+      - Version chains
+      
+      **ONTOLOGY ALIGNMENT**:
+      - slot_uri: prov:wasRevisionOf (PROV-O revision relationship)
+      
+    range: uriorcurie
+    
+    exact_mappings:
+      - prov:wasRevisionOf
+    
+    examples:
+      - value: https://nde.nl/record/123/v1
+        description: Previous version of record

frontend/public/schemas/20251121/linkml/modules/slots/is_or_was_transferred.yaml

@@ -0,0 +1,90 @@
+# is_or_was_transferred slot
+# Transfer event relationship following RiC-O naming pattern
+#
+# Generation date: 2026-01-15
+# Rule compliance: 38 (slot centralization + semantic URI), 39 (RiC-O naming), 53 (slot_fixes.yaml)
+#
+# Supports migrations per slot_fixes.yaml:
+# - transfer_to_collection_date → is_or_was_transferred + TransferEvent
+# - transfer_policy → is_or_was_transferred + TransferEvent
+# - transfer_location_text → is_or_was_transferred + TransferEvent
+# - transfer_location → is_or_was_transferred + TransferEvent
+
+id: https://nde.nl/ontology/hc/slot/is_or_was_transferred
+name: is_or_was_transferred_slot
+title: Is Or Was Transferred Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  rico: https://www.ica.org/standards/RiC/ontology#
+  prov: http://www.w3.org/ns/prov#
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+
+slots:
+  is_or_was_transferred:
+    slot_uri: rico:isOrWasAffectedBy
+    description: |
+      Links an entity to a transfer event that affected it.
+      
+      **Temporal Semantics** (RiC-O Pattern):
+      The "isOrWas" naming follows RiC-O convention indicating this
+      transfer may be historical.
+      
+      **Ontological Alignment**:
+      - **Primary** (`slot_uri`): `rico:isOrWasAffectedBy` - RiC-O affected by
+        (entity affected by an event)
+      - **Related**: `crm:P30_transferred_custody_of` - CIDOC-CRM custody transfer
+      - **Related**: `prov:wasInfluencedBy` - PROV-O influence
+      
+      **Use Cases**:
+      - Collection items transferred between institutions
+      - Archive holdings relocated to new facility
+      - Custody transfer of heritage materials
+      
+      **Range**: TransferEvent class (structured transfer with dates, locations, policy)
+      
+      **Cardinality**:
+      Multivalued - entities may have been transferred multiple times.
+      
+    range: TransferEvent
+    required: false
+    multivalued: true
+    inlined: true
+    inlined_as_list: true
+    
+    related_mappings:
+      - crm:P30_transferred_custody_of
+      - prov:wasInfluencedBy
+    
+    annotations:
+      rico_naming_convention: |
+        Follows RiC-O "isOrWas" pattern for temporal predicates.
+        See Rule 39: Slot Naming Convention (RiC-O Style)
+      replaces_slots: "transfer_to_collection_date, transfer_policy, transfer_location_text, transfer_location"
+      migration_date: "2026-01-15"
+      custodian_types: '["*"]'
+      custodian_types_rationale: Transfer events apply to all heritage custodian types.
+      specificity_score: 0.5
+      specificity_rationale: Specialized event relationship for custody/ownership changes.
+    
+    comments:
+      - "Links entity to transfer events"
+      - "Maps to rico:isOrWasAffectedBy for event-entity relationship"
+      - "Temporal: transfers are historical events"
+      - "RiC-O naming: isOrWas indicates historical relationship"
+      - "Replaces transfer_* slots per slot_fixes.yaml"
+    
+    examples:
+      - value:
+          temporal_extent:
+            begin_of_the_begin:
+              timestamp_value: "2020-01-15T00:00:00Z"
+          ends_or_ended_at_location:
+            location_name: "New Archive Building"
+        description: "Collection transfer to new facility"

frontend/public/schemas/20251121/linkml/modules/slots/is_or_was_webarchived_at.yaml

@@ -0,0 +1,86 @@
+# is_or_was_webarchived_at slot
+# Web archive URL following RiC-O naming pattern
+#
+# Generation date: 2026-01-15
+# Rule compliance: 38 (slot centralization + semantic URI), 39 (RiC-O naming), 53 (slot_fixes.yaml)
+#
+# Supports migration per slot_fixes.yaml:
+# - was_archived_at → is_or_was_webarchived_at + URL
+
+id: https://nde.nl/ontology/hc/slot/is_or_was_webarchived_at
+name: is_or_was_webarchived_at_slot
+title: Is Or Was Webarchived At Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  prov: http://www.w3.org/ns/prov#
+  schema: http://schema.org/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+
+slots:
+  is_or_was_webarchived_at:
+    slot_uri: prov:alternateOf
+    description: |
+      URL to a web archive snapshot of this entity's content.
+      
+      **Temporal Semantics** (RiC-O Pattern):
+      The "isOrWas" naming follows RiC-O convention. Web archives
+      capture content at a specific point in time.
+      
+      **Ontological Alignment**:
+      - **Primary** (`slot_uri`): `prov:alternateOf` - PROV-O alternate
+        representation (archived version of original)
+      - **Related**: `schema:archivedAt` - Schema.org archived location
+      
+      **Web Archive Services**:
+      - Internet Archive Wayback Machine: web.archive.org
+      - Archive.today: archive.ph
+      - UK Web Archive: webarchive.org.uk
+      - National library web archives
+      
+      **Range**: URL class (structured URL with type and metadata)
+      
+      **Provenance Value**:
+      Essential for data verification - archived snapshots prove
+      content existed at extraction time.
+      
+      **Cardinality**:
+      Multivalued - content may be archived at multiple services/times.
+      
+    range: URL
+    required: false
+    multivalued: true
+    inlined: true
+    inlined_as_list: true
+    
+    related_mappings:
+      - schema:archivedAt
+    
+    annotations:
+      rico_naming_convention: |
+        Follows RiC-O "isOrWas" pattern for temporal predicates.
+        See Rule 39: Slot Naming Convention (RiC-O Style)
+      replaces_slots: "was_archived_at"
+      migration_date: "2026-01-15"
+      custodian_types: '["*"]'
+      custodian_types_rationale: Web archiving applies to all heritage types.
+      specificity_score: 0.3
+      specificity_rationale: Specialized for provenance/archival contexts.
+    
+    comments:
+      - "Links to web archive snapshots"
+      - "Maps to prov:alternateOf for archived representation"
+      - "Essential for data provenance verification"
+      - "RiC-O naming: isOrWas indicates temporal snapshot"
+      - "Replaces was_archived_at per slot_fixes.yaml"
+    
+    examples:
+      - value:
+          url_value: "https://web.archive.org/web/20240101120000/https://www.rijksmuseum.nl/"
+          url_type: webarchive
+        description: "Wayback Machine snapshot of Rijksmuseum website"

frontend/public/schemas/20251121/linkml/modules/slots/location_name.yaml

@@ -0,0 +1,63 @@
+# location_name slot
+# Human-readable name for a geographic location
+#
+# Generation date: 2026-01-15
+# Rule compliance: 38 (slot centralization + semantic URI), 51 (no hallucinated refs)
+
+id: https://nde.nl/ontology/hc/slot/location_name
+name: location_name_slot
+title: Location Name Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  rdfs: http://www.w3.org/2000/01/rdf-schema#
+  locn: http://www.w3.org/ns/locn#
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+
+slots:
+  location_name:
+    slot_uri: schema:name
+    description: |
+      Human-readable name for a geographic location.
+      
+      **Ontological Alignment**:
+      - **Primary** (`slot_uri`): `schema:name` - Schema.org name
+      - **Exact**: `rdfs:label` - RDF Schema label
+      - **Related**: `locn:geographicName` - LOCN geographic name
+      
+      **Usage**:
+      Primary identifier for Location instances. Should be
+      human-readable and unambiguous where possible.
+      
+      **Examples**:
+      - "Rijksmuseum Amsterdam"
+      - "Noord-Hollands Archief, Haarlem"
+      - "Depot Boerhaave, Leiden"
+      
+    range: string
+    required: true
+    multivalued: false
+    
+    exact_mappings:
+      - rdfs:label
+    
+    related_mappings:
+      - locn:geographicName
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: Location names apply to all heritage types.
+      specificity_score: 0.2
+      specificity_rationale: Generic name slot for locations.
+    
+    examples:
+      - value: "Rijksmuseum Amsterdam"
+        description: "Museum location"
+      - value: "Noord-Hollands Archief, Haarlem"
+        description: "Archive location with city"

frontend/public/schemas/20251121/linkml/modules/slots/policy_text.yaml

@@ -0,0 +1,51 @@
+# policy_text slot
+# Full text content of a policy document
+#
+# Generation date: 2026-01-15
+# Rule compliance: 38 (slot centralization + semantic URI), 51 (no hallucinated refs)
+
+id: https://nde.nl/ontology/hc/slot/policy_text
+name: policy_text_slot
+title: Policy Text Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  dcterms: http://purl.org/dc/terms/
+  schema: http://schema.org/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+
+slots:
+  policy_text:
+    slot_uri: schema:text
+    description: |
+      Full text content of a policy document.
+      
+      **Ontological Alignment**:
+      - **Primary** (`slot_uri`): `schema:text` - Schema.org text content
+      - **Related**: `dcterms:description` - Dublin Core description
+      
+      **Usage**:
+      Contains the complete policy text. For very long policies,
+      this may contain a summary with reference to full document.
+      
+    range: string
+    required: false
+    multivalued: false
+    
+    related_mappings:
+      - dcterms:description
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: Policy text applies to all heritage types.
+      specificity_score: 0.4
+      specificity_rationale: Specialized slot for policy documentation.
+    
+    examples:
+      - value: "Materials may not be transferred to institutions outside the Netherlands without donor consent."
+        description: "Transfer restriction policy text"

frontend/public/schemas/20251121/linkml/modules/slots/provides_or_provided_provenance_to.yaml

@@ -0,0 +1,48 @@
+# provides_or_provided_provenance_to - Provenance relationship slot
+#
+# Created per slot_fixes.yaml migration for: used_by, used
+# Creation date: 2026-01-14
+# Rule compliance: 39 (RiC-O naming), 50 (ontology mapping)
+
+id: https://nde.nl/ontology/hc/slot/provides_or_provided_provenance_to
+name: provides_or_provided_provenance_to
+title: Provides or Provided Provenance To
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  prov: http://www.w3.org/ns/prov#
+
+default_prefix: hc
+
+slots:
+  provides_or_provided_provenance_to:
+    slot_uri: prov:wasUsedBy
+    description: |
+      Links an entity to activities or other entities that used it.
+      
+      **USAGE**:
+      Used to express provenance relationships:
+      - "This dataset was used by this research project"
+      - "This tool was used by this digitization activity"
+      
+      **ONTOLOGY ALIGNMENT**:
+      - slot_uri: prov:wasUsedBy (PROV-O usage relationship)
+      - Inverse of prov:used
+      
+    range: uriorcurie
+    multivalued: true
+    
+    exact_mappings:
+      - prov:wasUsedBy
+    
+    close_mappings:
+      - prov:wasGeneratedBy
+    
+    examples:
+      - value: https://nde.nl/activity/digitization-2024
+        description: Entity used by a digitization activity
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: "Provenance relationships applicable to all types."

frontend/public/schemas/20251121/linkml/modules/slots/slot_fixes.yaml

@@ -1632,6 +1632,17 @@ fixes:
         - label: TimeSpan
           type: class
           link_branch: 2
+      processed:
+        status: true
+        date: "2025-01-14"
+        notes: |
+          Migrated to has_or_had_quantity with Quantity class.
+          Branch 1: has_or_had_measurement_unit → MeasureUnit (enum: VISITOR)
+          Branch 2: temporal_extent → TimeSpan
+          Consuming classes updated: Exhibition.yaml, MuseumRegisterEnrichment.yaml
+          Archived slot: modules/slots/archive/visitor_count_archived_20260115.yaml
+          Created slot: modules/slots/has_or_had_measurement_unit.yaml
+          Updated enum: MeasureUnitEnum.yaml (added VISITOR, VIEW, ITEM, FTE, etc.)
     - original_slot_id: https://nde.nl/ontology/hc/slot/visitor_conversion_rate
       revision:
         - label: has_or_had_conversion_rate
@@ -1656,6 +1667,16 @@ fixes:
         - label: TimeSpan
           type: class
           link_branch: 2
+      processed:
+        status: true
+        date: "2026-01-14"
+        notes: |
+          Migration completed for visitor_conversion_rate slot.
+          Created: ConversionRate class, ConversionRateType class, ConversionRateTypes class, has_or_had_conversion_rate slot
+          Branch 1: has_or_had_type → ConversionRateType/ConversionRateTypes
+          Branch 2: temporal_extent → TimeSpan (reused existing)
+          Consuming classes updated: GiftShop.yaml
+          Archived slot: modules/slots/archive/visitor_conversion_rate_archived_20260114.yaml
     - original_slot_id: https://nde.nl/ontology/hc/slot/visiting_hour
       revision:
         - label: has_or_had_opening_hour
@@ -1682,6 +1703,17 @@ fixes:
         - label: TimeSpan 
           type: class
           link_branch: 2
+      processed:
+        status: true
+        date: "2025-01-14"
+        notes: |
+          Migrated to has_or_had_quantity with Quantity class.
+          Branch 1: has_or_had_measurement_unit → MeasureUnit (enum: VIEW)
+          Branch 2: temporal_extent → TimeSpan
+          Consuming slot-based class updated: VideoPost.yaml
+          NOTE: YoutubeVideo, YoutubeEnrichment, YoutubeChannel use inline attributes
+          (raw API response capture) - evaluated but not migrated per data pattern.
+          Archived slot: modules/slots/archive/view_count_archived_20260115.yaml
     - original_slot_id: https://nde.nl/ontology/hc/slot/video_id
       revision:
         - label: has_or_had_identifier
@@ -1886,6 +1918,16 @@ fixes:
         - label: TimeInterval
           type: class
           link_branch: 2
+      processed:
+        status: true
+        date: "2026-01-14"
+        notes: |
+          Migration completed for update_frequency slot.
+          Created: UpdateFrequency class, has_or_had_frequency slot
+          Branch 1: has_or_had_quantity → Quantity (reused existing)
+          Branch 2: has_or_had_time_interval → TimeInterval (reused existing)
+          Consuming classes updated: InternetOfThings.yaml
+          Archived slot: modules/slots/archive/update_frequency_archived_20260114.yaml
     - original_slot_id: https://nde.nl/ontology/hc/slot/unit_type
       revision:
         - label: has_or_had_type
@@ -1948,6 +1990,19 @@ fixes:
           value:
             - entity_resolution
           link_branch: 2
+      processed:
+        status: true
+        date: "2026-01-14"
+        notes: >-
+          Migrated unique_object_count to has_or_had_quantity with Quantity class.
+          Branch 1: has_or_had_measurement_unit → MeasureUnit (OBJECT unit type).
+          Branch 2: has_or_had_methodology → Methodology (ENTITY_RESOLUTION type).
+          Updated VideoAnnotationTypes.yaml (VideoObjectAnnotation class).
+          Created Methodology.yaml class with prov:Plan mapping.
+          Created MethodologyTypeEnum.yaml enum.
+          Created has_or_had_methodology.yaml slot.
+          Updated Quantity.yaml with has_or_had_methodology slot.
+          Archived: modules/slots/archive/unique_object_count_archived_20260114.yaml
     - original_slot_id: https://nde.nl/ontology/hc/slot/unique_face_count
       revision:
         - label: has_or_had_quantity
@@ -1970,6 +2025,16 @@ fixes:
           value:
             - entity_resolution
           link_branch: 2
+      processed:
+        status: true
+        date: "2026-01-14"
+        notes: >-
+          Migrated unique_face_count to has_or_had_quantity with Quantity class.
+          Branch 1: has_or_had_measurement_unit → MeasureUnit (FACE unit type).
+          Branch 2: has_or_had_methodology → Methodology (ENTITY_RESOLUTION type).
+          Updated VideoAnnotationTypes.yaml (VideoObjectAnnotation class).
+          Shares Methodology infrastructure with unique_object_count migration.
+          Archived: modules/slots/archive/unique_face_count_archived_20260114.yaml
     - original_slot_id: https://nde.nl/ontology/hc/slot/uniform_title
       revision:
         - label: has_or_had_label
@@ -2302,3 +2367,74 @@ fixes:
           type: slot
         - label: Description
           type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/transcript_format
+      revision:
+        - label: has_or_had_format
+          type: slot
+        - label: TranscriptFormat
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/traditional_product
+      revision:
+        - label: has_or_had_type
+          type: slot
+        - label: TraditionalProductType
+          type: class
+        - label: includes_or_included
+          type: slot  
+        - label: TraditionalProductTypes
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/tracking_ids_assigned
+      revision:
+        - label: has_or_had_identifier
+          type: slot
+        - label: Identifier
+          type: class
+        - label: has_or_had_quantity
+          type: slot
+        - label: Quantity
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/track_name
+      revision:
+        - label: has_or_had_label
+          type: slot
+        - label: Label
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/track_id
+      revision:
+        - label: has_or_had_identifier
+          type: slot
+        - label: TrackIdentifier
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/total_token
+      revision:
+        - label: consumes_or_consumed 
+          type: slot
+        - label: Token
+          type: class
+        - label: has_or_had_quantity
+          type: slot
+        - label: Quantity
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/total_revenue
+      revision:
+        - label: has_or_had_revenue
+          type: slot
+        - label: Revenue
+          type: class
+        - label: has_or_had_quantity
+          type: slot
+        - label: Quantity
+          type: class
+        - label: has_or_had_currency
+          type: slot
+          link_branch: 1
+        - label: Currency
+          type: class
+          link_branch: 1
+        - label: has_or_had_time_interval
+          type: slot
+          link_branch: 2
+        - label: TimeInterval
+          type: class
+          link_branch: 2
+    - original_slot_id: https://nde.nl/ontology/hc/slot/total_runtime

frontend/public/schemas/20251121/linkml/modules/slots/starts_or_started_at_location.yaml

@@ -0,0 +1,73 @@
+# starts_or_started_at_location slot
+# Origin location relationship following RiC-O naming pattern
+#
+# Generation date: 2026-01-15
+# Rule compliance: 38 (slot centralization + semantic URI), 39 (RiC-O naming), 53 (slot_fixes.yaml)
+#
+# Used by TransferEvent class for origin location
+
+id: https://nde.nl/ontology/hc/slot/starts_or_started_at_location
+name: starts_or_started_at_location_slot
+title: Starts Or Started At Location Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  prov: http://www.w3.org/ns/prov#
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+
+slots:
+  starts_or_started_at_location:
+    slot_uri: prov:atLocation
+    description: |
+      Origin location where an event or process started.
+      
+      **Temporal Semantics** (RiC-O Pattern):
+      The "startsOrStarted" naming follows RiC-O convention indicating
+      the location may be historical (where something began).
+      
+      **Ontological Alignment**:
+      - **Primary** (`slot_uri`): `prov:atLocation` - PROV-O location
+      - **Related**: `crm:P27_moved_from` - CIDOC-CRM moved from
+      - **Related**: `schema:fromLocation` - Schema.org origin
+      
+      **Use Cases**:
+      - Transfer event origin (where materials came from)
+      - Journey/movement start location
+      - Process initiation location
+      
+      **Range**: Location class (structured location with name and coordinates)
+      
+    range: Location
+    required: false
+    multivalued: false
+    inlined: true
+    
+    related_mappings:
+      - crm:P27_moved_from
+      - schema:fromLocation
+    
+    annotations:
+      rico_naming_convention: |
+        Follows RiC-O "startsOrStarted" pattern for temporal location predicates.
+        See Rule 39: Slot Naming Convention (RiC-O Style)
+      custodian_types: '["*"]'
+      custodian_types_rationale: Location relationships apply to all heritage types.
+      specificity_score: 0.4
+      specificity_rationale: Specialized slot for event/process locations.
+    
+    comments:
+      - "Origin location for events/processes"
+      - "Maps to prov:atLocation with start semantics"
+      - "RiC-O naming: startsOrStarted indicates temporal aspect"
+    
+    examples:
+      - value:
+          location_name: "Old Storage Facility, Amsterdam"
+        description: "Origin location for collection transfer"

frontend/public/schemas/20251121/linkml/modules/slots/timestamp_precision.yaml

@@ -0,0 +1,58 @@
+# timestamp_precision slot
+# The precision level of a timestamp
+#
+# Generation date: 2026-01-15
+# Rule compliance: 38 (slot centralization + semantic URI), 42 (no prefix), 43 (singular noun)
+
+id: https://nde.nl/ontology/hc/slot/timestamp_precision
+name: timestamp_precision_slot
+title: Timestamp Precision Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  time: http://www.w3.org/2006/time#
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+
+slots:
+  timestamp_precision:
+    slot_uri: time:unitType
+    description: |
+      The precision level of the timestamp.
+      
+      **Ontological Alignment**:
+      - **Primary** (`slot_uri`): `time:unitType` - OWL Time unit type
+      
+      **Values**:
+      - year: Precision to the year
+      - month: Precision to the month
+      - day: Precision to the day
+      - hour: Precision to the hour
+      - minute: Precision to the minute
+      - second: Precision to the second
+      - millisecond: Precision to the millisecond
+      
+      **Usage**:
+      Can be auto-derived from timestamp_value format if not explicitly provided.
+      
+    range: string
+    required: false
+    multivalued: false
+    
+    exact_mappings:
+      - time:unitType
+    
+    annotations:
+      migration_date: "2026-01-15"
+    
+    examples:
+      - value: "year"
+        description: "Year precision (e.g., '1995')"
+      - value: "day"
+        description: "Day precision (e.g., '1995-06-15')"
+      - value: "second"
+        description: "Second precision (e.g., '1995-06-15T10:30:00Z')"

frontend/public/schemas/20251121/linkml/modules/slots/timestamp_value.yaml

@@ -0,0 +1,58 @@
+# timestamp_value slot
+# The datetime value of a timestamp
+#
+# Generation date: 2026-01-15
+# Rule compliance: 38 (slot centralization + semantic URI), 42 (no prefix), 43 (singular noun)
+
+id: https://nde.nl/ontology/hc/slot/timestamp_value
+name: timestamp_value_slot
+title: Timestamp Value Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  time: http://www.w3.org/2006/time#
+  xsd: http://www.w3.org/2001/XMLSchema#
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+
+slots:
+  timestamp_value:
+    slot_uri: time:inXSDDateTimeStamp
+    description: |
+      The datetime value as ISO 8601 string.
+      
+      **Ontological Alignment**:
+      - **Primary** (`slot_uri`): `time:inXSDDateTimeStamp` - OWL Time position
+      
+      **Precision by Format**:
+      - "1995" = year precision
+      - "1995-06" = month precision
+      - "1995-06-15" = day precision
+      - "1995-06-15T10:30:00Z" = full datetime
+      
+    range: string
+    required: true
+    multivalued: false
+    pattern: "^-?\\d{4}(-\\d{2})?(-\\d{2})?(T\\d{2}:\\d{2}(:\\d{2})?(\\.\\d+)?(Z|[+-]\\d{2}:\\d{2})?)?$"
+    
+    exact_mappings:
+      - time:inXSDDateTimeStamp
+    
+    close_mappings:
+      - time:inXSDDate
+      - time:inXSDgYear
+    
+    annotations:
+      migration_date: "2026-01-15"
+    
+    examples:
+      - value: "1995"
+        description: "Year-only precision"
+      - value: "1995-06-15"
+        description: "Day precision"
+      - value: "2024-06-15T14:30:00Z"
+        description: "Full datetime with timezone"

frontend/public/schemas/20251121/linkml/modules/slots/url_type.yaml

@@ -0,0 +1,69 @@
+# url_type slot
+# Classification of URL type (website, api, archive, vendor, etc.)
+#
+# Generation date: 2026-01-15
+# Rule compliance: 38 (slot centralization + semantic URI), 51 (no hallucinated refs)
+#
+# Part of URL class supporting 4 migrations per slot_fixes.yaml
+
+id: https://nde.nl/ontology/hc/slot/url_type
+name: url_type_slot
+title: URL Type Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  dcterms: http://purl.org/dc/terms/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+
+slots:
+  url_type:
+    slot_uri: dcterms:type
+    description: |
+      Classification of the URL type.
+      
+      **Common Values**:
+      - `website` - Main institutional website
+      - `api` - API endpoint
+      - `webarchive` - Web archive snapshot (e.g., Wayback Machine)
+      - `vendor` - Vendor/supplier website
+      - `catalog` - Online catalog
+      - `collection` - Collection portal
+      - `social_media` - Social media profile
+      - `documentation` - Technical documentation
+      
+      **Ontological Alignment**:
+      - **Primary** (`slot_uri`): `dcterms:type` - Dublin Core type
+      - **Related**: `schema:additionalType` - Schema.org type
+      
+      **Usage**:
+      Optional classification to distinguish different types of URLs
+      associated with the same entity.
+      
+    range: string
+    required: false
+    multivalued: false
+    
+    related_mappings:
+      - schema:additionalType
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: URL types apply to all heritage types.
+      specificity_score: 0.2
+      specificity_rationale: Generic classification applicable across all contexts.
+    
+    examples:
+      - value: "website"
+        description: "Main institutional website"
+      - value: "api"
+        description: "API endpoint"
+      - value: "webarchive"
+        description: "Web archive snapshot"
+      - value: "vendor"
+        description: "Vendor/supplier website"

frontend/public/schemas/20251121/linkml/modules/slots/url_value.yaml

@@ -0,0 +1,60 @@
+# url_value slot
+# The actual URL/URI string value
+#
+# Generation date: 2026-01-15
+# Rule compliance: 38 (slot centralization + semantic URI), 51 (no hallucinated refs)
+#
+# Part of URL class supporting 4 migrations per slot_fixes.yaml
+
+id: https://nde.nl/ontology/hc/slot/url_value
+name: url_value_slot
+title: URL Value Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  dcterms: http://purl.org/dc/terms/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+
+slots:
+  url_value:
+    slot_uri: schema:url
+    description: |
+      The actual URL/URI string value.
+      
+      **Format**:
+      Valid URI following RFC 3986. Typically starts with http:// or https://.
+      
+      **Ontological Alignment**:
+      - **Primary** (`slot_uri`): `schema:url` - Schema.org URL
+      - **Exact**: `dcterms:URI` - Dublin Core URI
+      
+      **Usage**:
+      Primary value slot within URL class. Contains the actual web address.
+      Required field for URL instances.
+      
+    range: uri
+    required: true
+    multivalued: false
+    
+    exact_mappings:
+      - dcterms:URI
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: URL values apply to all heritage types.
+      specificity_score: 0.15
+      specificity_rationale: Generic URL value applicable across all contexts.
+    
+    examples:
+      - value: "https://www.rijksmuseum.nl/"
+        description: "Official website URL"
+      - value: "https://api.example.org/v1/collection"
+        description: "API endpoint URL"
+      - value: "https://web.archive.org/web/20240101/https://example.org/"
+        description: "Web archive snapshot URL"

frontend/public/schemas/20251121/linkml/modules/slots/wikidata_description.yaml

@@ -0,0 +1,70 @@
+# wikidata_description slot
+# Description text from Wikidata entity
+#
+# Generation date: 2026-01-15
+# Rule compliance: 38 (slot centralization + semantic URI), 51 (no hallucinated refs)
+#
+# Part of WikiDataEntry class supporting 5 migrations per slot_fixes.yaml
+
+id: https://nde.nl/ontology/hc/slot/wikidata_description
+name: wikidata_description_slot
+title: Wikidata Description Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  dcterms: http://purl.org/dc/terms/
+  skos: http://www.w3.org/2004/02/skos/core#
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+
+slots:
+  wikidata_description:
+    slot_uri: schema:description
+    description: |
+      Description text from the Wikidata entity.
+      
+      **Purpose**:
+      Provides a brief explanation of the Wikidata entity without
+      requiring a lookup to Wikidata. Language should match the
+      `language` field in the containing WikiDataEntry.
+      
+      **Ontological Alignment**:
+      - **Primary** (`slot_uri`): `schema:description` - Schema.org description
+      - **Exact**: `dcterms:description` - Dublin Core description
+      - **Close**: `skos:definition` - SKOS definition
+      
+      **Usage**:
+      Optional. Provides human-readable context explaining what the
+      Wikidata entity represents. Typically a single sentence.
+      
+      **Multilingual**:
+      Description language determined by `language` slot in WikiDataEntry.
+      
+    range: string
+    required: false
+    multivalued: false
+    
+    exact_mappings:
+      - dcterms:description
+    
+    close_mappings:
+      - skos:definition
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: Descriptions apply to all heritage types.
+      specificity_score: 0.2
+      specificity_rationale: Generic description slot applicable across all contexts.
+    
+    examples:
+      - value: "institution that holds and displays collections"
+        description: "English description for Q33506 (museum)"
+      - value: "Dutch national museum in Amsterdam"
+        description: "Description for Q190804 (Rijksmuseum)"
+      - value: "collection of books and other media"
+        description: "Description for Q7075 (library)"

frontend/public/schemas/20251121/linkml/modules/slots/wikidata_label.yaml

@@ -0,0 +1,71 @@
+# wikidata_label slot
+# Human-readable label from Wikidata entity
+#
+# Generation date: 2026-01-15
+# Rule compliance: 38 (slot centralization + semantic URI), 51 (no hallucinated refs)
+#
+# Part of WikiDataEntry class supporting 5 migrations per slot_fixes.yaml
+
+id: https://nde.nl/ontology/hc/slot/wikidata_label
+name: wikidata_label_slot
+title: Wikidata Label Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  rdfs: http://www.w3.org/2000/01/rdf-schema#
+  skos: http://www.w3.org/2004/02/skos/core#
+  schema: http://schema.org/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+
+slots:
+  wikidata_label:
+    slot_uri: rdfs:label
+    description: |
+      Human-readable label from the Wikidata entity.
+      
+      **Purpose**:
+      Provides a display name for the Wikidata entity without requiring
+      a lookup to Wikidata. Language of label should match the `language`
+      field in the containing WikiDataEntry.
+      
+      **Ontological Alignment**:
+      - **Primary** (`slot_uri`): `rdfs:label` - RDF Schema label
+      - **Exact**: `skos:prefLabel` - SKOS preferred label
+      - **Close**: `schema:name` - Schema.org name
+      
+      **Usage**:
+      Optional but recommended. Provides human-readable context for
+      the Q-number identifier. Should be populated when available
+      from Wikidata API responses.
+      
+      **Multilingual**:
+      Label language determined by `language` slot in WikiDataEntry.
+      
+    range: string
+    required: false
+    multivalued: false
+    
+    exact_mappings:
+      - skos:prefLabel
+    
+    close_mappings:
+      - schema:name
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: Labels apply to all heritage types.
+      specificity_score: 0.2
+      specificity_rationale: Generic label slot applicable across all contexts.
+    
+    examples:
+      - value: "museum"
+        description: "English label for Q33506"
+      - value: "Rijksmuseum"
+        description: "Label for Q190804"
+      - value: "bibliotheek"
+        description: "Dutch label for Q7075 (library)"

frontend/public/schemas/20251121/linkml/modules/slots/wikidata_qid.yaml

@@ -0,0 +1,72 @@
+# wikidata_qid slot
+# Wikidata Q-number identifier (e.g., Q12345)
+#
+# Generation date: 2026-01-15
+# Rule compliance: 38 (slot centralization + semantic URI), 51 (no hallucinated refs)
+#
+# Part of WikiDataEntry class supporting 5 migrations per slot_fixes.yaml
+
+id: https://nde.nl/ontology/hc/slot/wikidata_qid
+name: wikidata_qid_slot
+title: Wikidata QID Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  wdt: http://www.wikidata.org/prop/direct/
+  schema: http://schema.org/
+  dcterms: http://purl.org/dc/terms/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+
+slots:
+  wikidata_qid:
+    slot_uri: wdt:P31
+    description: |
+      Wikidata Q-number identifier for the referenced entity.
+      
+      **Format**:
+      Q followed by one or more digits (e.g., Q12345, Q190804).
+      Pattern: `^Q[0-9]+$`
+      
+      **Ontological Alignment**:
+      - **Primary** (`slot_uri`): `wdt:P31` - Wikidata direct property
+      - **Close**: `schema:identifier` - Schema.org identifier
+      - **Related**: `dcterms:identifier` - Dublin Core identifier
+      
+      **Usage**:
+      Primary identifier within WikiDataEntry class. Required field
+      for identifying the Wikidata entity being referenced.
+      
+      **Examples**:
+      - Q33506 - museum (concept)
+      - Q190804 - Rijksmuseum (institution)
+      - Q7075 - library (concept)
+      
+    range: string
+    required: true
+    multivalued: false
+    pattern: "^Q[0-9]+$"
+    
+    exact_mappings:
+      - schema:identifier
+    
+    close_mappings:
+      - dcterms:identifier
+    
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: Wikidata identifiers apply to all heritage types.
+      specificity_score: 0.2
+      specificity_rationale: Generic identifier applicable across all contexts.
+    
+    examples:
+      - value: "Q33506"
+        description: "Wikidata Q-number for 'museum' concept"
+      - value: "Q190804"
+        description: "Wikidata Q-number for Rijksmuseum"
+      - value: "Q7075"
+        description: "Wikidata Q-number for 'library' concept"