diff --git a/data/fixes/slot_fixes.yaml b/data/fixes/slot_fixes.yaml
index d3563c16ce..9e23bff147 100644
--- a/data/fixes/slot_fixes.yaml
+++ b/data/fixes/slot_fixes.yaml
@@ -16202,6 +16202,11 @@ fixes:
     date: '2026-01-27'
     notes: 'Auto-marked: Targets exist: slot is_or_was_associated_with exists, class DigitalPlatform exists'
 - original_slot_id: https://nde.nl/ontology/hc/slot/has_or_had_audit_status
+  processed:
+    status: true
+    timestamp: '2026-01-28T00:00:00Z'
+    session: session-2026-01-28-audit-status-migration
+    notes: 'FULLY MIGRATED: FinancialStatement - has_or_had_audit_status REMOVED. Updated has_or_had_status usage to support AuditStatus (via any_of). Created AuditStatusTypes.yaml. Updated AuditStatus.yaml. Archived has_or_had_audit_status to archive/.'
   revision:
   - label: has_or_had_status
     type: slot
@@ -16259,6 +16264,12 @@ fixes:
     type: slot
   - label: AssessmentCategoryTypes
     type: class
+  processed:
+    status: true
+    timestamp: '2026-01-28T00:20:00Z'
+    session: session-2026-01-28-category-assessment-migration
+    notes: 'FULLY MIGRATED: StorageCondition - has_or_had_category_assessment replaced with includes_or_included (composition) linking to StorageConditionCategoryAssessment. Within that class, has_assessment_category (string) replaced with has_or_had_category (AssessmentCategory). Original slot file was missing/ghost.'
+
 - original_slot_id: https://nde.nl/ontology/hc/slot/has_or_had_classification
   revision:
   - label: is_or_was_classified_as
@@ -17050,6 +17061,12 @@ fixes:
     type: slot
   - label: Dataset
     type: class
+  processed:
+    status: true
+    timestamp: '2026-01-28T00:30:00Z'
+    session: session-2026-01-28-registered-dataset-migration
+    notes: 'FULLY MIGRATED: WebPortalTypes - has_or_had_registered_dataset replaced with registers_or_registered linking to Dataset. Inline RegisteredDataset class removed, replaced by Dataset class (dcat:Dataset). Dataset.yaml updated with necessary slots.'
+
 - original_slot_id: https://nde.nl/ontology/hc/slot/has_or_had_registration_number
   revision:
   - label: has_or_had_identifier
@@ -17828,8 +17845,8 @@ fixes:
     type: class
   processed:
     status: true
-    date: '2026-01-27'
-    notes: 'Auto-marked: Targets exist: slot has_or_had_label exists, class Label exists'
+    date: '2026-01-28'
+    notes: 'FULLY MIGRATED: HistoricBuilding.yaml updated to use has_or_had_label. historic_building_name.yaml archived.'
 - original_slot_id: https://nde.nl/ontology/hc/slot/historic-garden-designation
   revision:
   - label: has_or_had_facility
diff --git a/frontend/public/schemas/20251121/linkml/manifest.json b/frontend/public/schemas/20251121/linkml/manifest.json
index c951380fcf..89bef7e848 100644
--- a/frontend/public/schemas/20251121/linkml/manifest.json
+++ b/frontend/public/schemas/20251121/linkml/manifest.json
@@ -1,5 +1,5 @@
 {
-  "generated": "2026-01-27T21:17:12.304Z",
+  "generated": "2026-01-28T00:11:55.430Z",
   "schemaRoot": "/schemas/20251121/linkml",
   "totalFiles": 3000,
   "categoryCounts": {
diff --git a/schemas/20251121/linkml/manifest.json b/schemas/20251121/linkml/manifest.json
index 89bef7e848..5e17753ec3 100644
--- a/schemas/20251121/linkml/manifest.json
+++ b/schemas/20251121/linkml/manifest.json
@@ -1,5 +1,5 @@
 {
-  "generated": "2026-01-28T00:11:55.430Z",
+  "generated": "2026-01-28T00:27:25.137Z",
   "schemaRoot": "/schemas/20251121/linkml",
   "totalFiles": 3000,
   "categoryCounts": {
diff --git a/schemas/20251121/linkml/modules/classes/AssessmentCategory.yaml b/schemas/20251121/linkml/modules/classes/AssessmentCategory.yaml
index 2b5dee59a9..842a742296 100644
--- a/schemas/20251121/linkml/modules/classes/AssessmentCategory.yaml
+++ b/schemas/20251121/linkml/modules/classes/AssessmentCategory.yaml
@@ -9,17 +9,20 @@ prefixes:
 default_prefix: hc
 imports:
 - linkml:types
-- ../slots/has_or_had_category
+- ../slots/has_or_had_type
+- ./AssessmentCategoryType
+
 classes:
   AssessmentCategory:
     class_uri: skos:Concept
     description: Assessment category concept.
     slots:
-    - has_or_had_category
+    - has_or_had_type
     slot_usage:
-      has_or_had_category:
-        range: string
-        description: The category label or code.
+      has_or_had_type:
+        range: AssessmentCategoryType
+        description: The type of assessment category.
+
     annotations:
       specificity_score: 0.1
       specificity_rationale: Generic utility class/slot created during migration
diff --git a/schemas/20251121/linkml/modules/classes/AssessmentCategoryTypes.yaml b/schemas/20251121/linkml/modules/classes/AssessmentCategoryTypes.yaml
new file mode 100644
index 0000000000..06b9dc12a9
--- /dev/null
+++ b/schemas/20251121/linkml/modules/classes/AssessmentCategoryTypes.yaml
@@ -0,0 +1,28 @@
+id: https://nde.nl/ontology/hc/class/AssessmentCategoryTypes
+name: AssessmentCategoryTypes
+title: AssessmentCategoryTypes
+description: >-
+  Concrete assessment category types.
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ./AssessmentCategoryType
+
+classes:
+  ConditionAssessmentCategory:
+    is_a: AssessmentCategoryType
+    description: Category for storage condition assessment (e.g. Good, Fair, Poor).
+    annotations:
+      custodian_types: ["*"]
+
+  RiskAssessmentCategory:
+    is_a: AssessmentCategoryType
+    description: Category for risk assessment.
+    annotations:
+      custodian_types: ["*"]
diff --git a/schemas/20251121/linkml/modules/classes/AuditStatus.yaml b/schemas/20251121/linkml/modules/classes/AuditStatus.yaml
index 7abb1b33b4..93ed29a9df 100644
--- a/schemas/20251121/linkml/modules/classes/AuditStatus.yaml
+++ b/schemas/20251121/linkml/modules/classes/AuditStatus.yaml
@@ -14,6 +14,8 @@ default_prefix: hc
 imports:
   - linkml:types
   - ../slots/has_or_had_label
+  - ../slots/has_or_had_type
+  - ./AuditStatusType
 
 classes:
   AuditStatus:
@@ -27,3 +29,8 @@ classes:
     
     slots:
       - has_or_had_label
+      - has_or_had_type
+    
+    slot_usage:
+      has_or_had_type:
+        range: AuditStatusType
diff --git a/schemas/20251121/linkml/modules/classes/AuditStatusTypes.yaml b/schemas/20251121/linkml/modules/classes/AuditStatusTypes.yaml
new file mode 100644
index 0000000000..6487e42484
--- /dev/null
+++ b/schemas/20251121/linkml/modules/classes/AuditStatusTypes.yaml
@@ -0,0 +1,34 @@
+id: https://nde.nl/ontology/hc/class/AuditStatusTypes
+name: AuditStatusTypes
+title: AuditStatusTypes
+description: >-
+  Concrete audit status types.
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ./AuditStatusType
+
+classes:
+  AuditedStatus:
+    is_a: AuditStatusType
+    description: Financial statement has been audited.
+    annotations:
+      custodian_types: ["*"]
+
+  UnauditedStatus:
+    is_a: AuditStatusType
+    description: Financial statement has not been audited.
+    annotations:
+      custodian_types: ["*"]
+
+  ReviewStatus:
+    is_a: AuditStatusType
+    description: Financial statement has been reviewed but not fully audited.
+    annotations:
+      custodian_types: ["*"]
diff --git a/schemas/20251121/linkml/modules/classes/BioCustodianSubtype.yaml b/schemas/20251121/linkml/modules/classes/BioCustodianSubtype.yaml
index 454fe7bda9..db62eab700 100644
--- a/schemas/20251121/linkml/modules/classes/BioCustodianSubtype.yaml
+++ b/schemas/20251121/linkml/modules/classes/BioCustodianSubtype.yaml
@@ -13,7 +13,8 @@ imports:
 - ../slots/has_or_had_identifier
 - ../slots/has_or_had_label
 - ../slots/has_or_had_description
-- ../slots/wikidata_id
+- ../slots/is_or_was_equivalent_to
+- ./WikiDataIdentifier
 default_prefix: hc
 classes:
   BioCustodianSubtype:
@@ -56,7 +57,7 @@ classes:
       **Wikidata Integration**:
 
 
-      Each subtype links to a Wikidata entity via `wikidata_id`. The 1142 subtypes
+      Each subtype links to a Wikidata entity via `is_or_was_equivalent_to`. The 1142 subtypes
 
       in BioCustodianTypeEnum are candidates for promotion to concrete subclasses.
 
@@ -88,7 +89,7 @@ classes:
     - has_or_had_identifier
     - has_or_had_label
     - has_or_had_description
-    - wikidata_id
+    - is_or_was_equivalent_to
     slot_usage:
       has_or_had_identifier:
         identifier: true
@@ -110,15 +111,22 @@ classes:
       has_or_had_description:
         required: false
         range: string
-      wikidata_id:
+      is_or_was_equivalent_to:
         required: false
-        description: Wikidata entity ID for this subtype (e.g., Q167346 for botanical garden)
+        range: WikiDataIdentifier
+        description: Wikidata entity equivalent for this subtype (e.g., Q167346 for botanical garden). Replaces wikidata_id (Rule 53).
         examples:
-        - value: Q167346
+        - value:
+            qid: Q167346
+            label: botanical garden
           description: botanical garden
-        - value: Q43501
+        - value:
+            qid: Q43501
+            label: zoo
           description: zoo/zoological garden
-        - value: Q2281788
+        - value:
+            qid: Q2281788
+            label: public aquarium
           description: public aquarium
     comments:
     - Abstract base class for BioCustodianSubtypes hierarchy
diff --git a/schemas/20251121/linkml/modules/classes/BioTypeClassification.yaml b/schemas/20251121/linkml/modules/classes/BioTypeClassification.yaml
index 18f33d0d29..ee5735670a 100644
--- a/schemas/20251121/linkml/modules/classes/BioTypeClassification.yaml
+++ b/schemas/20251121/linkml/modules/classes/BioTypeClassification.yaml
@@ -13,7 +13,8 @@ imports:
 - ../slots/has_or_had_identifier
 - ../slots/has_or_had_label
 - ../slots/has_or_had_description
-- ../slots/wikidata_id
+- ../slots/is_or_was_equivalent_to
+- ./WikiDataIdentifier
 default_prefix: hc
 classes:
   BioTypeClassification:
@@ -29,7 +30,7 @@ classes:
     - has_or_had_identifier
     - has_or_had_label
     - has_or_had_description
-    - wikidata_id
+    - is_or_was_equivalent_to
     slot_usage:
       has_or_had_identifier:
         identifier: true
@@ -50,9 +51,10 @@ classes:
       has_or_had_description:
         required: false
         range: string
-      wikidata_id:
+      is_or_was_equivalent_to:
         required: false
-        description: Wikidata entity ID for this classification (if applicable)
+        range: WikiDataIdentifier
+        description: Wikidata entity equivalent for this classification (if applicable). Replaces wikidata_id (Rule 53).
     comments:
     - Abstract base class for BioTypeClassifications hierarchy
     - Follows Type/Types naming convention (Rule 0b)
diff --git a/schemas/20251121/linkml/modules/classes/BirthPlace.yaml b/schemas/20251121/linkml/modules/classes/BirthPlace.yaml
index 354a391427..ae14efe5a1 100644
--- a/schemas/20251121/linkml/modules/classes/BirthPlace.yaml
+++ b/schemas/20251121/linkml/modules/classes/BirthPlace.yaml
@@ -30,13 +30,14 @@ imports:
 - ../slots/modern_place_name
 - ../slots/place_source_text
 - ../slots/region_code
-- ../slots/wikidata_id
+- ../slots/has_or_had_identifier
+- ./WikiDataIdentifier
 default_prefix: hc
 classes:
   BirthPlace:
     class_uri: schema:Place
-    description: "Structured representation of a person's place of birth with support for historical place names, modern equivalents, and geographic identifiers.\n**PURPOSE**:\nBirthPlace replaces simple string birth_place slots to provide: - Historical place name preservation - Modern place name linkage - Geographic identifier integration (GeoNames, Wikidata) - Coordinate storage for mapping applications\n**HISTORICAL VS. MODERN NAMES**:\nMany birth places used historical names that have since changed: - \"Batavia\" \u2192 \"Jakarta\" - \"Bombay\" \u2192 \"Mumbai\" - \"Leningrad\" \u2192 \"St. Petersburg\" - \"Saigon\" \u2192 \"Ho Chi Minh City\"\nBirthPlace preserves the source name while linking to modern identifiers.\n**GEOGRAPHIC RESOLUTION**:\nPer AGENTS.md Rule on GeoNames as authoritative source: - `geonames_id`: Links to GeoNames for standardization - `wikidata_id`: Links to Wikidata for additional context - `coordinates`: Lat/lon for mapping\n**ONTOLOGY ALIGNMENT**:\n| Ontology\
-      \ | Mapping | Usage | |----------|---------|-------| | **Schema.org** | `schema:Place` | Primary class | | **CIDOC-CRM** | `crm:E53_Place` | Place entity | | **GeoNames** | `gn:Feature` | Geographic feature |\n**EXAMPLE**:\n```yaml has_or_had_place_of_birth:\n  place_name: \"Batavia\"\n  modern_place_name: \"Jakarta\"\n  country_code: \"ID\"\n  geonames_id: 1642911\n  wikidata_id: \"Q3630\"\n```"
+    description: "Structured representation of a person's place of birth with support for historical place names, modern equivalents, and geographic identifiers.\n**PURPOSE**:\nBirthPlace replaces simple string birth_place slots to provide: - Historical place name preservation - Modern place name linkage - Geographic identifier integration (GeoNames, Wikidata) - Coordinate storage for mapping applications\n**HISTORICAL VS. MODERN NAMES**:\nMany birth places used historical names that have since changed: - \"Batavia\" \u2192 \"Jakarta\" - \"Bombay\" \u2192 \"Mumbai\" - \"Leningrad\" \u2192 \"St. Petersburg\" - \"Saigon\" \u2192 \"Ho Chi Minh City\"\nBirthPlace preserves the source name while linking to modern identifiers.\n**GEOGRAPHIC RESOLUTION**:\nPer AGENTS.md Rule on GeoNames as authoritative source: - `geonames_id`: Links to GeoNames for standardization - `has_or_had_identifier`: Links to Wikidata for additional context - `coordinates`: Lat/lon for mapping\n**ONTOLOGY ALIGNMENT**:\n| Ontology\
+      \ | Mapping | Usage | |----------|---------|-------| | **Schema.org** | `schema:Place` | Primary class | | **CIDOC-CRM** | `crm:E53_Place` | Place entity | | **GeoNames** | `gn:Feature` | Geographic feature |\n**EXAMPLE**:\n```yaml has_or_had_place_of_birth:\n  place_name: \"Batavia\"\n  modern_place_name: \"Jakarta\"\n  country_code: \"ID\"\n  geonames_id: 1642911\n  has_or_had_identifier:\n    qid: \"Q3630\"\n```"
     exact_mappings:
     - schema:Place
     close_mappings:
@@ -48,7 +49,7 @@ classes:
     - country_code
     - region_code
     - geonames_id
-    - wikidata_id
+    - has_or_had_identifier
     - coordinates
     - place_source_text
     - specificity_annotation
@@ -92,13 +93,13 @@ classes:
         examples:
         - value: 2759794
           description: Amsterdam GeoNames ID
-      wikidata_id:
-        range: string
+      has_or_had_identifier:
+        range: WikiDataIdentifier
         required: false
-        pattern: ^Q[0-9]+$
-        description: Wikidata entity identifier for the place.
+        description: Wikidata entity identifier for the place. MIGRATED from wikidata_id (Rule 53).
         examples:
-        - value: Q727
+        - value:
+            qid: Q727
           description: Amsterdam Wikidata ID
       coordinates:
         range: string
@@ -126,7 +127,8 @@ classes:
         country_code: NL
         region_code: NH
         geonames_id: 2759794
-        wikidata_id: Q727
+        has_or_had_identifier:
+          qid: Q727
         coordinates: 52.3676,4.9041
       description: Birth place with full geographic resolution
     - value:
@@ -134,7 +136,8 @@ classes:
         modern_place_name: Jakarta
         country_code: ID
         geonames_id: 1642911
-        wikidata_id: Q3630
+        has_or_had_identifier:
+          qid: Q3630
       description: Historical place name with modern equivalent
     - value:
         place_name: rural Gelderland
@@ -142,6 +145,7 @@ classes:
         region_code: GE
         place_source_text: born at the family estate in rural Gelderland
       description: Imprecise location from archival source
+
     annotations:
       specificity_score: 0.45
       specificity_rationale: Birth places are relevant for person research across heritage sectors.
diff --git a/schemas/20251121/linkml/modules/classes/BoundingBox.yaml b/schemas/20251121/linkml/modules/classes/BoundingBox.yaml
index b86aa83788..f449592eba 100644
--- a/schemas/20251121/linkml/modules/classes/BoundingBox.yaml
+++ b/schemas/20251121/linkml/modules/classes/BoundingBox.yaml
@@ -11,19 +11,23 @@ prefixes:
   geosparql: http://www.opengis.net/ont/geosparql#
 imports:
 - linkml:types
-- ../slots/x_coordinate
-- ../slots/y_coordinate
-- ../slots/width
-- ../slots/height
+- ../slots/has_or_had_coordinates
+- ../slots/has_or_had_width
+- ../slots/has_or_had_height
+- ./PlanarCoordinates
 default_prefix: hc
 classes:
   BoundingBox:
     class_uri: schema:PropertyValue
     slots:
-    - x_coordinate
-    - y_coordinate
-    - width
-    - height
+    - has_or_had_coordinates
+    - has_or_had_width
+    - has_or_had_height
+    slot_usage:
+      has_or_had_coordinates:
+        range: PlanarCoordinates
+        description: Origin coordinates (x, y) of the bounding box.
+        required: true
     annotations:
       specificity_score: 0.1
       specificity_rationale: Generic utility class/slot created during migration
diff --git a/schemas/20251121/linkml/modules/classes/CustodianObservation.yaml b/schemas/20251121/linkml/modules/classes/CustodianObservation.yaml
index c94bb4b391..53a8ec5b62 100644
--- a/schemas/20251121/linkml/modules/classes/CustodianObservation.yaml
+++ b/schemas/20251121/linkml/modules/classes/CustodianObservation.yaml
@@ -16,7 +16,7 @@ imports:
 - ./Appellation
 - ./SourceDocument
 - ./CustodianLegalStatus
-- ./ConfidenceMeasure
+- ./ConfidenceValue
 - ./LanguageCode
 - ./SpecificityAnnotation
 - ./TemplateSpecificityScore
@@ -33,10 +33,11 @@ imports:
 - ../slots/observation_context
 - ../slots/refers_or_referred_to
 - ./EntityReconstruction
-- ../slots/has_or_had_confidence_measure
+- ../slots/has_or_had_value
 - ../slots/has_or_had_type
 - ../slots/specificity_annotation
 - ../slots/has_or_had_score
+
 classes:
   CustodianObservation:
     class_uri: hc:CustodianObservation
@@ -53,11 +54,12 @@ classes:
     - dcterms:BibliographicResource
     slots:
     - has_or_had_label
-    - has_or_had_confidence_measure
+    - has_or_had_value
     - has_or_had_type
     - refers_or_referred_to
     - observation_context
     - observation_date
+
     - observation_source
     - observed_name
     - source
@@ -124,11 +126,15 @@ classes:
         examples:
         - value: https://nde.nl/ontology/hc/legal/stichting-rijksmuseum
           description: Observation refers to Rijksmuseum legal entity
-      has_or_had_confidence_measure:
-        range: ConfidenceMeasure
+      has_or_had_value:
+        description: |
+          Confidence value associated with this observation.
+          MIGRATED from has_or_had_confidence_measure per Rule 53 (2026-01-28).
+        range: ConfidenceValue
       has_or_had_type:
         equals_expression: '["hc:GalleryType", "hc:LibraryType", "hc:ArchiveOrganizationType", "hc:MuseumType", "hc:OfficialInstitutionType", "hc:ResearchOrganizationType", "hc:CommercialOrganizationType", "hc:UnspecifiedType", "hc:BioCustodianType", "hc:EducationProviderType", "hc:HeritageSocietyType", "hc:FeatureCustodianType", "hc:IntangibleHeritageGroupType", "hc:MixedCustodianType", "hc:PersonalCollectionType", "hc:HolySacredSiteType", "hc:DigitalPlatformType", "hc:NonProfitType", "hc:TasteScentHeritageType"]'
     annotations:
+
       specificity_score: 0.1
       specificity_rationale: Generic utility class/slot created during migration
       custodian_types:
diff --git a/schemas/20251121/linkml/modules/classes/Dataset.yaml b/schemas/20251121/linkml/modules/classes/Dataset.yaml
new file mode 100644
index 0000000000..bedfe2bfcc
--- /dev/null
+++ b/schemas/20251121/linkml/modules/classes/Dataset.yaml
@@ -0,0 +1,46 @@
+id: https://nde.nl/ontology/hc/class/Dataset
+name: Dataset
+title: Dataset
+description: >-
+  A collection of data, published or curated by a single agent, and available for access or download in one or more formats.
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  dcat: http://www.w3.org/ns/dcat#
+  dcterms: http://purl.org/dc/terms/
+default_prefix: hc
+imports:
+  - linkml:types
+  - ../slots/has_or_had_label
+  - ../slots/has_or_had_description
+  - ../slots/has_or_had_identifier
+  - ../slots/has_availability_timespan
+  - ../slots/has_or_had_title
+  - ../slots/can_or_could_be_retrieved_from
+  - ../slots/linked_data_access
+  - ../slots/is_or_was_published_by
+  - ../slots/specificity_annotation
+  - ../slots/has_or_had_score
+  - ./SpecificityAnnotation
+  - ./TemplateSpecificityScore
+classes:
+  Dataset:
+    class_uri: dcat:Dataset
+    description: A collection of data.
+    slots:
+      - has_or_had_label
+      - has_or_had_description
+      - has_or_had_identifier
+      - has_availability_timespan
+      - has_or_had_title
+      - can_or_could_be_retrieved_from
+      - linked_data_access
+      - is_or_was_published_by
+      - specificity_annotation
+      - has_or_had_score
+
+    annotations:
+      specificity_score: 0.5
+      specificity_rationale: "Core data entity"
+      custodian_types: ["*"]
+      custodian_types_rationale: "Universal utility concept"
diff --git a/schemas/20251121/linkml/modules/classes/FinancialStatement.yaml b/schemas/20251121/linkml/modules/classes/FinancialStatement.yaml
index 838ebda47f..35896802eb 100644
--- a/schemas/20251121/linkml/modules/classes/FinancialStatement.yaml
+++ b/schemas/20251121/linkml/modules/classes/FinancialStatement.yaml
@@ -32,6 +32,9 @@ imports:
 - ./RecordSetTypes
 - ../slots/has_or_had_status
 - ./RecordStatus
+- ./AuditStatus
+- ./AuditStatusType
+- ./AuditStatusTypes
 - ../slots/financial_document_format
 - ../slots/has_or_had_url
 - ./URL
@@ -177,12 +180,6 @@ classes:
             currency: EUR
             description: Fundraising and donor relations expenses
           description: Functional expense breakdown for Dutch museum
-      has_or_had_audit_status:
-        range: string
-        required: false
-        examples:
-        - value: AUDITED
-          description: Full independent audit completed
       has_auditor_name:
         range: string
         required: false
@@ -241,20 +238,23 @@ classes:
             identifier_scheme: IRS_EIN
           description: IRS Employer Identification Number (filing ID)
       has_or_had_status:
-        description: 'Lifecycle stage of the financial record (Active, Inactive).
-
-          MIGRATED from financial_archival_stage per Rule 53.
-
-          Uses RecordStatus class but supports simple string for backward compatibility.
-
-          '
-        range: string
-        required: false
+        description: 'Status of the financial statement (e.g. Audit status, Lifecycle stage).
+          MIGRATED from has_or_had_audit_status and financial_archival_stage.
+          Supports multiple statuses (e.g. Audited + Active).
+          Rule 59: Use range: Any with any_of for union types.'
+        multivalued: true
+        range: Any
+        any_of:
+          - range: AuditStatus
+          - range: RecordStatus
+          - range: string
         examples:
+        - value:
+            has_or_had_type: AuditedStatus
+            has_or_had_label: Audited
+          description: Audit status
         - value: ACTIVE
-          description: Current year statement in active use
-        - value: INACTIVE
-          description: Prior year in retention period
+          description: Lifecycle status (string compatibility)
       has_or_had_format:
         description: 'Format of the financial document (PDF, XBRL, etc.).
 
@@ -365,13 +365,15 @@ classes:
           amount: 3200000.0
           currency: EUR
           description: Fundraising and donor relations expenses
-        audit_status: AUDITED
         auditor_name: KPMG Accountants N.V.
         audit_opinion: UNQUALIFIED
         audit_date: '2024-03-20'
         has_or_had_url: https://www.rijksmuseum.nl/en/about-us/annual-report-2023
         has_or_had_format: PDF
-        has_or_had_status: ACTIVE
+        has_or_had_status:
+        - has_or_had_type: AuditedStatus
+          has_or_had_label: Audited
+        - ACTIVE
         documents_or_documented:
         - https://nde.nl/ontology/hc/budget/rm/fy2023
         refers_to_custodian: https://nde.nl/ontology/hc/nl-nh-ams-m-rm-q190804
@@ -411,13 +413,15 @@ classes:
         total_assets: 5200000000.0
         total_liabilities: 520000000.0
         total_net_assets: 4680000000.0
-        audit_status: AUDITED
         financial_document_url: https://projects.propublica.org/nonprofits/organizations/131624102
         has_or_had_type: IRS Form 990
         has_or_had_identifier:
         - identifier_value: 13-1624102
           identifier_scheme: IRS_EIN
-        financial_archival_stage: INACTIVE
+        has_or_had_status:
+        - has_or_had_type: AuditedStatus
+          has_or_had_label: Audited
+        - INACTIVE
         documents_or_documented:
         - https://nde.nl/ontology/hc/budget/met/fy2022
         refers_to_custodian: https://nde.nl/ontology/hc/us-ny-nyc-m-met
diff --git a/schemas/20251121/linkml/modules/classes/FindingAid.yaml b/schemas/20251121/linkml/modules/classes/FindingAid.yaml
index e5aedf5c2d..8eaa220acb 100644
--- a/schemas/20251121/linkml/modules/classes/FindingAid.yaml
+++ b/schemas/20251121/linkml/modules/classes/FindingAid.yaml
@@ -99,10 +99,12 @@ imports:
 - ../slots/contains_or_contained
 - ../slots/contains_or_contained
 - ../slots/contains_or_contained_en
-- ../slots/historical_region
+- ../slots/is_or_was_located_in
+- ./HistoricalRegion
 - ../slots/html_snapshot_path
 - ../slots/inbound_from
 - ../slots/international
+
 - ../slots/is_sub_guide
 - ../slots/isil
 - ../slots/has_or_had_key_archive
diff --git a/schemas/20251121/linkml/modules/classes/HeritageForm.yaml b/schemas/20251121/linkml/modules/classes/HeritageForm.yaml
new file mode 100644
index 0000000000..a1c850fbe4
--- /dev/null
+++ b/schemas/20251121/linkml/modules/classes/HeritageForm.yaml
@@ -0,0 +1,25 @@
+id: https://nde.nl/ontology/hc/class/HeritageForm
+name: HeritageForm
+title: HeritageForm
+description: A form of heritage, such as an intangible cultural heritage practice.
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  skos: http://www.w3.org/2004/02/skos/core#
+default_prefix: hc
+imports:
+  - linkml:types
+  - ../slots/has_or_had_label
+  - ../slots/has_or_had_description
+classes:
+  HeritageForm:
+    class_uri: skos:Concept
+    description: A form of heritage.
+    slots:
+      - has_or_had_label
+      - has_or_had_description
+    annotations:
+      specificity_score: 0.1
+      specificity_rationale: "Generic utility class created during migration"
+      custodian_types: ["*"]
+      custodian_types_rationale: "Universal utility concept"
diff --git a/schemas/20251121/linkml/modules/classes/HistoricBuilding.yaml b/schemas/20251121/linkml/modules/classes/HistoricBuilding.yaml
index 99e170299d..4ee6503163 100644
--- a/schemas/20251121/linkml/modules/classes/HistoricBuilding.yaml
+++ b/schemas/20251121/linkml/modules/classes/HistoricBuilding.yaml
@@ -83,7 +83,6 @@ classes:
     - heritage_status
     - historic_building_description
     - historic_building_id
-    - historic_building_name
     - is_open_to_public
     - is_part_of_complex
     - monument_number
@@ -100,16 +99,6 @@ classes:
         examples:
         - value: https://nde.nl/ontology/hc/aux/mauritshuis-johan-de-witt
           description: Mauritshuis secondary property
-      historic_building_name:
-        range: string
-        required: true
-        examples:
-        - value: Johan de Witthuis
-          description: Historic house name
-        - value: Kasteel Amerongen
-          description: Castle name
-        - value: Oude Raadhuis Naarden
-          description: Former town hall
       historic_building_description:
         range: string
         examples:
@@ -237,24 +226,26 @@ classes:
         - value: true
           description: Part of complex
       has_or_had_label:
-        description: 'MIGRATED from complex_name per slot_fixes.yaml (Rule 53, 2026-01-18).
+        description: 'MIGRATED from historic_building_name and complex_name per slot_fixes.yaml (Rule 53, 2026-01-27).
 
-          Name of the complex/ensemble if applicable.
+          Name of the historic building (type: preferred_name) or the complex/ensemble (type: complex_name).
 
-          Uses Label class with has_or_had_type: complex_name for type discrimination.
+          Uses Label class with has_or_had_type for type discrimination.
 
           '
         range: Label
         inlined: true
+        multivalued: true
+        required: true
         examples:
+        - value:
+            has_or_had_label: Johan de Witthuis
+            has_or_had_type: preferred_name
+          description: Historic building name
         - value:
             has_or_had_label: Klooster Ter Apel
             has_or_had_type: complex_name
-          description: Monastery complex
-        - value:
-            has_or_had_label: Paleis Het Loo ensemble
-            has_or_had_type: complex_name
-          description: Palace complex
+          description: Monastery complex name
       has_or_had_area:
         description: Floor area of the historic building. MIGRATED from building_floor_area_sqm (Rule 53).
         range: Area
@@ -337,6 +328,7 @@ classes:
     - Distinguished from CustodianPlace (main headquarters)
     - May be open to public or used for operations/events
     - 'MIGRATION NOTE: has_or_had_area replaced building_floor_area_sqm (Rule 53)'
+    - 'MIGRATION NOTE: has_or_had_label replaced historic_building_name (Rule 53)'
     see_also:
     - http://vocab.getty.edu/aat/300005425
     - https://schema.org/LandmarksOrHistoricalBuildings
@@ -344,7 +336,9 @@ classes:
     examples:
     - value:
         historic_building_id: https://nde.nl/ontology/hc/aux/mauritshuis-johan-de-witt
-        historic_building_name: Johan de Witthuis
+        has_or_had_label:
+          - has_or_had_label: Johan de Witthuis
+            has_or_had_type: preferred_name
         historic_building_description: 17th-century canal house, former residence of Grand Pensionary Johan de Witt. Now part of Mauritshuis complex.
         has_or_had_type: HISTORIC_HOUSE_MUSEUM
         construction_date: '1650'
@@ -369,13 +363,14 @@ classes:
       description: Historic canal house as secondary property
     - value:
         historic_building_id: https://nde.nl/ontology/hc/aux/klooster-ter-apel
-        historic_building_name: Klooster Ter Apel - Gasthuis
+        has_or_had_label:
+          - has_or_had_label: Klooster Ter Apel - Gasthuis
+            has_or_had_type: preferred_name
+          - has_or_had_label: Kasteel Amerongen landgoed
+            has_or_had_type: complex_name
         has_or_had_type: MONASTERY
         construction_date: '1465'
         is_part_of_complex: true
-        has_or_had_label:
-          has_or_had_label: Kasteel Amerongen landgoed
-          has_or_had_type: complex_name
         current_use: Museum and events
         has_or_had_condition:
           has_or_had_type: GOOD
diff --git a/schemas/20251121/linkml/modules/classes/HistoricalRegion.yaml b/schemas/20251121/linkml/modules/classes/HistoricalRegion.yaml
new file mode 100644
index 0000000000..24d466f189
--- /dev/null
+++ b/schemas/20251121/linkml/modules/classes/HistoricalRegion.yaml
@@ -0,0 +1,62 @@
+id: https://nde.nl/ontology/hc/class/HistoricalRegion
+name: historical_region_class
+title: Historical Region Class
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  dcterms: http://purl.org/dc/terms/
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  skos: http://www.w3.org/2004/02/skos/core#
+  gn: http://www.geonames.org/ontology#
+  rdfs: http://www.w3.org/2000/01/rdf-schema#
+imports:
+- linkml:types
+- ../slots/has_or_had_label
+- ../slots/has_or_had_type
+- ../slots/temporal_extent
+- ./TimeSpan
+- ../slots/is_or_was_located_in
+- ../slots/has_or_had_identifier
+- ./Identifier
+- ../slots/has_or_had_description
+default_prefix: hc
+classes:
+  HistoricalRegion:
+    class_uri: schema:Place
+    description: "A geographic region that existed in the past (e.g., Duchy of Burgundy, Prussia, Austria-Hungary).\n\n**MIGRATED** from historical_region slot (2026-01-28).\n\n**USE CASE**:\nFinding aids often refer to regions that no longer exist or whose boundaries have changed.\nThis class allows capturing the historical name, type, and temporal extent of such regions.\n"
+    exact_mappings:
+    - schema:Place
+    close_mappings:
+    - crm:E53_Place
+    - gn:Feature
+    slots:
+    - has_or_had_label
+    - has_or_had_type
+    - temporal_extent
+    - is_or_was_located_in
+    - has_or_had_identifier
+    - has_or_had_description
+    slot_usage:
+      has_or_had_label:
+        range: string
+        required: true
+        description: Name of the historical region.
+        examples:
+        - value: Duchy of Brabant
+        - value: Prussia
+      has_or_had_type:
+        range: string
+        description: Type of region (e.g., Duchy, Kingdom, Province).
+      temporal_extent:
+        range: TimeSpan
+        description: Time period during which the region existed or was relevant.
+      is_or_was_located_in:
+        range: HistoricalRegion
+        description: Larger historical region containing this one (e.g., Brabant in Holy Roman Empire).
+    annotations:
+      specificity_score: 0.3
+      specificity_rationale: Specialized geographic concept for historical archives.
+      custodian_types:
+      - '*'
+      custodian_types_rationale: Universal utility concept for historical context.
diff --git a/schemas/20251121/linkml/modules/classes/IntangibleHeritageForm.yaml b/schemas/20251121/linkml/modules/classes/IntangibleHeritageForm.yaml
index 1151e14066..9b6c7c5839 100644
--- a/schemas/20251121/linkml/modules/classes/IntangibleHeritageForm.yaml
+++ b/schemas/20251121/linkml/modules/classes/IntangibleHeritageForm.yaml
@@ -5,7 +5,9 @@ imports:
 - linkml:types
 - ../metadata
 - ./TimeSpan
-- ./Custodian
+- ./Custodia
+- ./HeritageForm
+- ../slots/is_or_was_related_to
 - ../slots/safeguarded_by
 - ./WikiDataIdentifier
 - ../slots/geographic_scope
@@ -51,6 +53,7 @@ prefixes:
   ich: https://ich.unesco.org/
 classes:
   IntangibleHeritageForm:
+    is_a: HeritageForm
     class_uri: crm:E28_Conceptual_Object
     description: "A recognized intangible cultural heritage practice, tradition, or expression.\n\nModels the heritage form ITSELF, not its specific occurrences (events/performances).\nExamples: Pride Amsterdam, Divali, 1 aprilviering Brielle, Bloemencorso Bollenstreek.\n\n**UNESCO 2003 Convention Definition**:\n\nIntangible cultural heritage includes:\n- Oral traditions and expressions (including language as vehicle of ICH)\n- Performing arts\n- Social practices, rituals, and festive events\n- Knowledge and practices concerning nature and the universe\n- Traditional craftsmanship\n\n**Dutch Context (KIEN)**:\n\nKIEN (Kenniscentrum Immaterieel Erfgoed Nederland) maintains the Dutch National\nInventory of Intangible Cultural Heritage. Heritage forms are registered after\ncommunity nomination and expert review.\n\n**Key Distinctions**:\n\n| Concept | Class | Example |\n|---------|-------|---------|\n| Heritage form (abstract) | IntangibleHeritageForm | \"Pride Amsterdam\" (the tradition) |\n\
       | Specific occurrence | IntangibleHeritageEvent | \"Pride Amsterdam 2024\" |\n| Specific performance | IntangibleHeritagePerformance | \"Gamelan performance at X\" |\n| Organization that preserves | Custodian (type I) | \"Stichting Amsterdam Gay Pride\" |\n\n- **CIDOC-CRM**: crm:E28_Conceptual_Object (intangible concept)\n- **CIDOC-CRM**: crm:E55_Type (as categorization of heritage)\n- **Schema.org**: schema:Intangible (web semantics)\n- **SKOS**: skos:Concept (for taxonomy/thesaurus purposes)\n\n**Relationship to Custodians**:\n\nIntangibleHeritageForm is linked to Custodian via:\n- `safeguarded_by`: Custodians who preserve this heritage form\n- Inverse: Custodian.safeguards \u2192 IntangibleHeritageForm\n"
@@ -74,7 +77,7 @@ classes:
     - kien_url
     - origin_location
     - origin_period
-    - has_or_had_related_heritage_form
+    - is_or_was_related_to
     - safeguarded_by
     - safeguarding_measure
     - specificity_annotation
diff --git a/schemas/20251121/linkml/modules/classes/PlanarCoordinates.yaml b/schemas/20251121/linkml/modules/classes/PlanarCoordinates.yaml
new file mode 100644
index 0000000000..98fd37e4ac
--- /dev/null
+++ b/schemas/20251121/linkml/modules/classes/PlanarCoordinates.yaml
@@ -0,0 +1,29 @@
+id: https://nde.nl/ontology/hc/class/PlanarCoordinates
+name: planar_coordinates_class
+title: Planar Coordinates Class
+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
+classes:
+  PlanarCoordinates:
+    description: "2D planar coordinates (x, y) for image regions, bounding boxes, or surfaces.\n\nUsed by BoundingBox to define the origin point.\nCoordinates are typically normalized (0.0-1.0) or in pixels."
+    attributes:
+      x:
+        range: float
+        required: true
+        description: X coordinate (horizontal position/left edge).
+      y:
+        range: float
+        required: true
+        description: Y coordinate (vertical position/top edge).
+    annotations:
+      specificity_score: 0.1
+      specificity_rationale: Generic utility class.
+      custodian_types:
+      - '*'
+      custodian_types_rationale: Universal utility concept
diff --git a/schemas/20251121/linkml/modules/classes/ReconstructionActivity.yaml b/schemas/20251121/linkml/modules/classes/ReconstructionActivity.yaml
index 207c47bbe9..e6ad3a1e36 100644
--- a/schemas/20251121/linkml/modules/classes/ReconstructionActivity.yaml
+++ b/schemas/20251121/linkml/modules/classes/ReconstructionActivity.yaml
@@ -16,7 +16,7 @@ imports:
   - ./ReconstructionAgent
   - ./TimeSpan
   - ./CustodianObservation
-  - ./ConfidenceMeasure
+  - ./ConfidenceValue
   - ../slots/id
   - ../slots/has_or_had_activity_type
   - ../slots/method
@@ -24,9 +24,10 @@ imports:
   - ../slots/temporal_extent
   # REMOVED 2026-01-15: ../slots/used - migrated to has_or_had_used_source with CustodianObservation range (Rule 53)
   - ../slots/has_or_had_used_source
-  - ../slots/has_or_had_confidence_measure
+  - ../slots/has_or_had_value  # was: has_or_had_confidence_measure - migrated per Rule 53 (2026-01-28)
   - ../slots/justification
   - ../slots/specificity_annotation
+
   - ../slots/has_or_had_score  # was: template_specificity - migrated per Rule 53 (2026-01-17)
   - ./SpecificityAnnotation
   - ./TemplateSpecificityScore  # was: TemplateSpecificityScores - migrated per Rule 53 (2026-01-17)
@@ -51,9 +52,10 @@ imports:
     - crm:E13_Attribute_Assignment
     slots:
     - has_or_had_activity_type
-    - has_or_had_confidence_measure
+    - has_or_had_value  # was: has_or_had_confidence_measure - migrated per Rule 53 (2026-01-28)
     # has_or_had_generate REMOVED - migrated to generates_or_generated (Rule 53)
     - generates_or_generated
+
     - id
     - justification
     - method
@@ -78,12 +80,14 @@ imports:
         range: CustodianObservation
         multivalued: true
         required: true
-      has_or_had_confidence_measure:
+      has_or_had_value:  # was: has_or_had_confidence_measure - migrated per Rule 53 (2026-01-28)
         required: false
         description: |
           Confidence in the reconstruction activity's PROCESS and methodology.
-          MIGRATED 2026-01-16: Uses ConfidenceMeasure class via has_or_had_confidence_measure slot.
+          MIGRATED 2026-01-28: Uses ConfidenceValue class via has_or_had_value slot.
+        range: ConfidenceValue
       generates_or_generated:
+
         description: |
           Output(s) generated by the reconstruction activity.
           MIGRATED from has_or_had_generate per Rule 53.
diff --git a/schemas/20251121/linkml/modules/classes/RegistrationAuthority.yaml b/schemas/20251121/linkml/modules/classes/RegistrationAuthority.yaml
index 0cbf14b2fd..fbc105a1e4 100644
--- a/schemas/20251121/linkml/modules/classes/RegistrationAuthority.yaml
+++ b/schemas/20251121/linkml/modules/classes/RegistrationAuthority.yaml
@@ -20,6 +20,8 @@ imports:
 - ../slots/description
 - ../slots/specificity_annotation
 - ../slots/has_or_had_score
+- ../slots/is_or_was_equivalent_to
+- ./WikiDataIdentifier
 - ./SpecificityAnnotation
 - ./TemplateSpecificityScore
 - ./TemplateSpecificityType
@@ -247,9 +249,14 @@ classes:
         slot_uri: schema:description
         description: Description of the registration authority and its role
         range: string
-      wikidata_id:
+    slots:
+    - specificity_annotation
+    - has_or_had_score
+    - is_or_was_equivalent_to
+    slot_usage:
+      is_or_was_equivalent_to:
         slot_uri: schema:sameAs
-        description: 'Wikidata Q-ID for this registration authority.
+        description: 'Wikidata entity equivalent for this registration authority.
 
 
           Examples:
@@ -261,11 +268,12 @@ classes:
           - Danish Agency for Culture and Palaces: Q12324270
 
           '
-        range: string
-        pattern: ^Q[0-9]+$
-    slots:
-    - specificity_annotation
-    - has_or_had_score
+        range: WikiDataIdentifier
+        examples:
+        - value:
+            qid: Q12324270
+            label: Danish Agency for Culture and Palaces
+          description: Registration authority for ISIL
     annotations:
       specificity_score: 0.1
       specificity_rationale: Generic utility class/slot created during migration
diff --git a/schemas/20251121/linkml/modules/classes/StorageCondition.yaml b/schemas/20251121/linkml/modules/classes/StorageCondition.yaml
index 3340399c47..8f15a22944 100644
--- a/schemas/20251121/linkml/modules/classes/StorageCondition.yaml
+++ b/schemas/20251121/linkml/modules/classes/StorageCondition.yaml
@@ -27,9 +27,11 @@ imports:
   - ../slots/indicates_or_indicated  # was: follow_up_date - migrated per Rule 53 (2026-01-26)
   - ./ConservationReview  # for indicates_or_indicated range
   # has_assessment_category REMOVED - migrated to has_or_had_category + AssessmentCategory (Rule 53)
-  - ../slots/has_or_had_category
+  - ../slots/includes_or_included
   - ./AssessmentCategory
-  - ../slots/has_or_had_category_assessment
+  - ./AssessmentCategoryType
+  - ./AssessmentCategoryTypes
+  - ../slots/has_or_had_category
   # - ../slots/category_measurement  # ARCHIVED 2026-01-24: migrated to has_or_had_measurement + Measurement per Rule 53/56
   - ../slots/has_or_had_measurement
   - ./Measurement
@@ -62,6 +64,7 @@ imports:
   - ../slots/remediation_note
   - ../slots/remediation_required
   - ../slots/specificity_annotation
+  - ../slots/supersede_condition
   - ../slots/has_or_had_score  # was: template_specificity - migrated per Rule 53 (2026-01-17)
   - ./SpecificityAnnotation
   - ./TemplateSpecificityScore  # was: TemplateSpecificityScores - migrated per Rule 53 (2026-01-17)
@@ -107,7 +110,7 @@ classes:
     - pico:Observation
     - hc:StorageEnvironmentObservation
     slots:
-    - has_or_had_category_assessment
+    - includes_or_included
     # REMOVED 2026-01-22: compliance_status - migrated to has_or_had_status + ComplianceStatus (Rule 53)
     - has_or_had_status
     - has_or_had_identifier  # was: condition_id - migrated per Rule 53 (2026-01-18)
@@ -197,17 +200,28 @@ classes:
           description: White ant infestation discovered
         - value: GOOD
           description: All parameters within acceptable ranges
-      has_or_had_category_assessment:
+      includes_or_included:
+        description: |
+          Categorized assessment results.
+          MIGRATED from has_or_had_category_assessment per Rule 53 (2026-01-28).
+          Replaces bespoke/classification slots with generic composition slot.
         range: StorageConditionCategoryAssessment
         multivalued: true
         inlined_as_list: true
         examples:
         - value:
-          - category: TEMPERATURE
-            status: GOOD
-            measurement: 19.5°C
-          - category: PEST_CONTROL
-            status: CRITICAL
+          - has_or_had_category:
+              has_or_had_type: TEMPERATURE
+            has_or_had_status:
+              has_or_had_type: GOOD
+            has_or_had_measurement:
+              - has_or_had_unit:
+                  has_or_had_label: Celsius
+                measurement_value: 19.5
+          - has_or_had_category:
+              has_or_had_type: PEST_CONTROL
+            has_or_had_status:
+              has_or_had_type: CRITICAL
             has_or_had_note:  # was: note - migrated per Rule 53/56 (2026-01-18)
               - note_type: category
                 note_content: White ants discovered in main depot area
@@ -346,9 +360,11 @@ classes:
         observer_affiliation: De Volkskrant
         is_official_assessment: false
         overall_status: CRITICAL
-        has_or_had_category_assessment:
-        - category: PEST_CONTROL
-          status: CRITICAL
+        includes_or_included:
+        - has_or_had_category:
+            has_or_had_type: PEST_CONTROL
+          has_or_had_status:
+            has_or_had_type: CRITICAL
           has_or_had_note:  # was: note - migrated per Rule 53/56 (2026-01-18)
             - note_type: category
               note_content: White ants discovered in main document depot
@@ -379,20 +395,34 @@ classes:
         observer_affiliation: Rijksmuseum
         is_official_assessment: true
         overall_status: GOOD
-        has_or_had_category_assessment:
-        - category: TEMPERATURE
-          status: EXCELLENT
-          measurement: 18.5°C average
-        - category: HUMIDITY
-          status: GOOD
-          measurement: 48% RH average
-        - category: PEST_CONTROL
-          status: GOOD
+        includes_or_included:
+        - has_or_had_category:
+            has_or_had_type: TEMPERATURE
+          has_or_had_status:
+            has_or_had_type: EXCELLENT
+          has_or_had_measurement:
+            - measurement_value: 18.5
+              has_or_had_unit:
+                has_or_had_label: Celsius
+        - has_or_had_category:
+            has_or_had_type: HUMIDITY
+          has_or_had_status:
+            has_or_had_type: GOOD
+          has_or_had_measurement:
+            - measurement_value: 48
+              has_or_had_unit:
+                has_or_had_label: Percent
+        - has_or_had_category:
+            has_or_had_type: PEST_CONTROL
+          has_or_had_status:
+            has_or_had_type: GOOD
           has_or_had_note:  # was: note - migrated per Rule 53/56 (2026-01-18)
             - note_type: category
               note_content: No pest activity detected in monitoring traps
-        - category: SECURITY
-          status: EXCELLENT
+        - has_or_had_category:
+            has_or_had_type: SECURITY
+          has_or_had_status:
+            has_or_had_type: EXCELLENT
         observation_notes: Quarterly facilities review. All parameters within policy ranges.
         # MIGRATED 2026-01-22: compliance_status → has_or_had_status + ComplianceStatus (Rule 53)
         has_or_had_status:
@@ -416,16 +446,20 @@ classes:
 
       '
     slots:
-    - has_assessment_category
+    - has_or_had_category
     - has_or_had_measurement  # was: category_measurement - migrated per Rule 53/56 (2026-01-24)
     - has_or_had_note  # was: category_note - migrated per Rule 53/56 (2026-01-18)
     - has_or_had_status  # was: category_status - migrated per Rule 53/56 (2026-01-24)
     - specificity_annotation
     - has_or_had_score  # was: template_specificity - migrated per Rule 53 (2026-01-17)
     slot_usage:
-      has_assessment_category:
-        range: string
+      has_or_had_category:
+        description: |
+          Category of assessment (e.g., PEST_CONTROL, TEMPERATURE).
+          MIGRATED from has_assessment_category per Rule 53 (2026-01-28).
+        range: AssessmentCategory
         required: true
+        inlined: true
       has_or_had_status:  # was: category_status - migrated per Rule 53/56 (2026-01-24)
         description: |
           MIGRATED from category_status per Rule 53/56 (2026-01-24).
diff --git a/schemas/20251121/linkml/modules/classes/TasteScentSubType.yaml b/schemas/20251121/linkml/modules/classes/TasteScentSubType.yaml
index 8549967ffd..7d97571bc1 100644
--- a/schemas/20251121/linkml/modules/classes/TasteScentSubType.yaml
+++ b/schemas/20251121/linkml/modules/classes/TasteScentSubType.yaml
@@ -22,11 +22,11 @@ prefixes:
 default_prefix: hc
 
 imports:
-  - linkml:types
-  - ../slots/has_or_had_label
-  - ../slots/has_or_had_description
-  - ../slots/wikidata_id  # For linking to Wikidata entity
-
+- linkml:types
+- ../slots/has_or_had_label
+- ../slots/has_or_had_description
+- ../slots/is_or_was_equivalent_to
+- ./WikiDataIdentifier
 classes:
   TasteScentSubType:
     class_uri: skos:Concept
@@ -58,7 +58,7 @@ classes:
     slots:
       - has_or_had_label
       - has_or_had_description
-      - wikidata_id  # For linking to Wikidata entity
+      - is_or_was_equivalent_to
     
     slot_usage:
       has_or_had_label:
@@ -76,12 +76,17 @@ classes:
         examples:
           - value: Business that makes and sells beer
             description: Brewery description
-      wikidata_id:
-        description: Wikidata entity ID for this taste/scent subtype.
+      is_or_was_equivalent_to:
+        description: Wikidata entity equivalent for this taste/scent subtype. Replaces wikidata_id (Rule 53).
+        range: WikiDataIdentifier
         examples:
-          - value: Q131734
+          - value:
+              qid: Q131734
+              label: brewery
             description: wikidata:Q131734 (brewery)
-          - value: Q30022
+          - value:
+              qid: Q30022
+              label: café
             description: wikidata:Q30022 (café)
     
     annotations:
diff --git a/schemas/20251121/linkml/modules/classes/WebPortalTypes.yaml b/schemas/20251121/linkml/modules/classes/WebPortalTypes.yaml
index e344ecc439..b45ae66f3c 100644
--- a/schemas/20251121/linkml/modules/classes/WebPortalTypes.yaml
+++ b/schemas/20251121/linkml/modules/classes/WebPortalTypes.yaml
@@ -35,9 +35,11 @@ imports:
 - ../slots/has_or_had_endpoint
 - ./LinkedDataEndpoint
 - ./Endpoint
-- ../slots/has_or_had_registered_dataset
+- ../slots/registers_or_registered
+- ./Dataset
 - ../slots/has_or_had_scope
 - ../slots/has_or_had_feature
+
 - ../slots/has_or_had_standard
 - ../slots/linked_data_access
 - ../slots/portal_type_category
@@ -1113,9 +1115,10 @@ classes:
     slots:
     - has_or_had_linked_data_endpoint
     - has_or_had_open_access_endpoint
-    - has_or_had_registered_dataset
+    - registers_or_registered
     - specificity_annotation
     - has_or_had_score
+
     comments:
     - National/regional dataset registry for heritage data
     - Typical standards: DCAT, Schema.org, Dublin Core
@@ -1139,45 +1142,4 @@ classes:
     - No longer actively maintained but preserved for link persistence
     - Legacy status is observation-relative, not user-relative (query-time)
     - 'Examples: Superseded regional portals, merged services'
-  RegisteredDataset:
-    description: 'A dataset registered in a DatasetRegister with temporal availability tracking.
 
-
-      **PURPOSE**: Track when a dataset was available in a register, enabling
-
-      historical queries about what datasets were discoverable at any point in time.
-
-
-      **TEMPORAL SEMANTICS**:
-
-      The `availability_timespan` captures:
-
-      - When the dataset first appeared in the register (P82a_begin_of_the_begin)
-
-      - When the dataset was last known to be available (P81b_end_of_the_end)
-
-      - Null end date indicates the dataset is still registered
-
-
-      **LINKING**:
-
-      - `is_or_was_published_by`: The Custodian that published this dataset
-
-      - `sparql_endpoint`: LinkedDataHub providing semantic access
-
-      - `download_endpoint`: OpenAccessRepository providing bulk access (MIGRATED to `can_or_could_be_retrieved_from`)
-
-      '
-    class_uri: dcat:Dataset
-    slots:
-    - has_availability_timespan
-    - has_or_had_description
-    - has_or_had_identifier
-    - has_or_had_title
-    - can_or_could_be_retrieved_from
-    - linked_data_access
-    - is_or_was_published_by
-    - specificity_annotation
-    - has_or_had_score
-    exact_mappings:
-    - dcat:Dataset
diff --git a/schemas/20251121/linkml/modules/slots/has_or_had_audit_status.yaml b/schemas/20251121/linkml/modules/slots/archive/has_or_had_audit_status_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/has_or_had_audit_status.yaml
rename to schemas/20251121/linkml/modules/slots/archive/has_or_had_audit_status_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/has_or_had_category_assessment.yaml b/schemas/20251121/linkml/modules/slots/archive/has_or_had_category_assessment_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/has_or_had_category_assessment.yaml
rename to schemas/20251121/linkml/modules/slots/archive/has_or_had_category_assessment_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/has_or_had_registered_dataset.yaml b/schemas/20251121/linkml/modules/slots/archive/has_or_had_registered_dataset_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/has_or_had_registered_dataset.yaml
rename to schemas/20251121/linkml/modules/slots/archive/has_or_had_registered_dataset_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/archive/has_or_had_x_coordinate_archived_20260128.yaml b/schemas/20251121/linkml/modules/slots/archive/has_or_had_x_coordinate_archived_20260128.yaml
new file mode 100644
index 0000000000..6742ee689c
--- /dev/null
+++ b/schemas/20251121/linkml/modules/slots/archive/has_or_had_x_coordinate_archived_20260128.yaml
@@ -0,0 +1,32 @@
+id: https://nde.nl/ontology/hc/slot/has_or_had_x_coordinate
+name: has_or_had_x_coordinate_slot
+title: Has Or Had X Coordinate Slot
+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#
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  skos: http://www.w3.org/2004/02/skos/core#
+  rdfs: http://www.w3.org/2000/01/rdf-schema#
+  org: http://www.w3.org/ns/org#
+  xsd: http://www.w3.org/2001/XMLSchema#
+default_prefix: hc
+imports:
+- linkml:types
+slots:
+  has_or_had_x_coordinate:
+    name: has_or_had_x_coordinate
+    description: X coordinate (left edge) of a bounding box. MIGRATED from x_coordinate (Rule 53).
+    slot_uri: schema:value
+    range: float
+    annotations:
+      rico_naming_convention: Follows RiC-O "hasOrHad" pattern for temporal predicates.
+      replaces_slots: x_coordinate
+      migration_date: '2026-01-28'
+      custodian_types:
+      - '*'
+      custodian_types_rationale: Universal utility concept
+    exact_mappings:
+    - schema:value
diff --git a/schemas/20251121/linkml/modules/slots/archive/has_or_had_y_coordinate_archived_20260128.yaml b/schemas/20251121/linkml/modules/slots/archive/has_or_had_y_coordinate_archived_20260128.yaml
new file mode 100644
index 0000000000..b26a0f481c
--- /dev/null
+++ b/schemas/20251121/linkml/modules/slots/archive/has_or_had_y_coordinate_archived_20260128.yaml
@@ -0,0 +1,32 @@
+id: https://nde.nl/ontology/hc/slot/has_or_had_y_coordinate
+name: has_or_had_y_coordinate_slot
+title: Has Or Had Y Coordinate Slot
+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#
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  skos: http://www.w3.org/2004/02/skos/core#
+  rdfs: http://www.w3.org/2000/01/rdf-schema#
+  org: http://www.w3.org/ns/org#
+  xsd: http://www.w3.org/2001/XMLSchema#
+default_prefix: hc
+imports:
+- linkml:types
+slots:
+  has_or_had_y_coordinate:
+    name: has_or_had_y_coordinate
+    description: Y coordinate (top edge) of a bounding box. MIGRATED from y_coordinate (Rule 53).
+    slot_uri: schema:value
+    range: float
+    annotations:
+      rico_naming_convention: Follows RiC-O "hasOrHad" pattern for temporal predicates.
+      replaces_slots: y_coordinate
+      migration_date: '2026-01-28'
+      custodian_types:
+      - '*'
+      custodian_types_rationale: Universal utility concept
+    exact_mappings:
+    - schema:value
diff --git a/schemas/20251121/linkml/modules/slots/height.yaml b/schemas/20251121/linkml/modules/slots/archive/height_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/height.yaml
rename to schemas/20251121/linkml/modules/slots/archive/height_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/historic_building_name.yaml b/schemas/20251121/linkml/modules/slots/archive/historic_building_name_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/historic_building_name.yaml
rename to schemas/20251121/linkml/modules/slots/archive/historic_building_name_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/width.yaml b/schemas/20251121/linkml/modules/slots/archive/width_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/width.yaml
rename to schemas/20251121/linkml/modules/slots/archive/width_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/wikidata_entity.yaml b/schemas/20251121/linkml/modules/slots/archive/wikidata_entity_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/wikidata_entity.yaml
rename to schemas/20251121/linkml/modules/slots/archive/wikidata_entity_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/wikidata_equivalent.yaml b/schemas/20251121/linkml/modules/slots/archive/wikidata_equivalent_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/wikidata_equivalent.yaml
rename to schemas/20251121/linkml/modules/slots/archive/wikidata_equivalent_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/wikidata_id.yaml b/schemas/20251121/linkml/modules/slots/archive/wikidata_id_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/wikidata_id.yaml
rename to schemas/20251121/linkml/modules/slots/archive/wikidata_id_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/x_coordinate.yaml b/schemas/20251121/linkml/modules/slots/archive/x_coordinate_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/x_coordinate.yaml
rename to schemas/20251121/linkml/modules/slots/archive/x_coordinate_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/y_coordinate.yaml b/schemas/20251121/linkml/modules/slots/archive/y_coordinate_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/y_coordinate.yaml
rename to schemas/20251121/linkml/modules/slots/archive/y_coordinate_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/has_or_had_coordinates.yaml b/schemas/20251121/linkml/modules/slots/has_or_had_coordinates.yaml
index db1533ae70..925516791a 100644
--- a/schemas/20251121/linkml/modules/slots/has_or_had_coordinates.yaml
+++ b/schemas/20251121/linkml/modules/slots/has_or_had_coordinates.yaml
@@ -18,9 +18,12 @@ imports:
 slots:
   has_or_had_coordinates:
     name: has_or_had_coordinates
-    description: Geographic coordinates.
+    description: "Geographic or planar coordinates.\n\nRange can be `Coordinates` (Geo/LatLon) or `PlanarCoordinates` (X/Y)."
     slot_uri: schema:geo
-    range: Coordinates
+    range: Any
+    any_of:
+      - range: Coordinates
+      - range: PlanarCoordinates
     multivalued: true
     annotations:
       custodian_types:
diff --git a/schemas/20251121/linkml/modules/slots/has_or_had_height.yaml b/schemas/20251121/linkml/modules/slots/has_or_had_height.yaml
new file mode 100644
index 0000000000..f45f30850b
--- /dev/null
+++ b/schemas/20251121/linkml/modules/slots/has_or_had_height.yaml
@@ -0,0 +1,32 @@
+id: https://nde.nl/ontology/hc/slot/has_or_had_height
+name: has_or_had_height_slot
+title: Has Or Had Height Slot
+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#
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  skos: http://www.w3.org/2004/02/skos/core#
+  rdfs: http://www.w3.org/2000/01/rdf-schema#
+  org: http://www.w3.org/ns/org#
+  xsd: http://www.w3.org/2001/XMLSchema#
+default_prefix: hc
+imports:
+- linkml:types
+slots:
+  has_or_had_height:
+    name: has_or_had_height
+    description: Height of a bounding box or object. MIGRATED from height (Rule 53).
+    slot_uri: schema:height
+    range: float
+    annotations:
+      rico_naming_convention: Follows RiC-O "hasOrHad" pattern for temporal predicates.
+      replaces_slots: height
+      migration_date: '2026-01-28'
+      custodian_types:
+      - '*'
+      custodian_types_rationale: Universal utility concept
+    exact_mappings:
+    - schema:height
diff --git a/schemas/20251121/linkml/modules/slots/has_or_had_width.yaml b/schemas/20251121/linkml/modules/slots/has_or_had_width.yaml
new file mode 100644
index 0000000000..94322eef67
--- /dev/null
+++ b/schemas/20251121/linkml/modules/slots/has_or_had_width.yaml
@@ -0,0 +1,32 @@
+id: https://nde.nl/ontology/hc/slot/has_or_had_width
+name: has_or_had_width_slot
+title: Has Or Had Width Slot
+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#
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  skos: http://www.w3.org/2004/02/skos/core#
+  rdfs: http://www.w3.org/2000/01/rdf-schema#
+  org: http://www.w3.org/ns/org#
+  xsd: http://www.w3.org/2001/XMLSchema#
+default_prefix: hc
+imports:
+- linkml:types
+slots:
+  has_or_had_width:
+    name: has_or_had_width
+    description: Width of a bounding box or object. MIGRATED from width (Rule 53).
+    slot_uri: schema:width
+    range: float
+    annotations:
+      rico_naming_convention: Follows RiC-O "hasOrHad" pattern for temporal predicates.
+      replaces_slots: width
+      migration_date: '2026-01-28'
+      custodian_types:
+      - '*'
+      custodian_types_rationale: Universal utility concept
+    exact_mappings:
+    - schema:width
diff --git a/schemas/20251121/linkml/modules/slots/registers_or_registered.yaml b/schemas/20251121/linkml/modules/slots/registers_or_registered.yaml
new file mode 100644
index 0000000000..7e093da796
--- /dev/null
+++ b/schemas/20251121/linkml/modules/slots/registers_or_registered.yaml
@@ -0,0 +1,22 @@
+id: https://nde.nl/ontology/hc/slot/registers_or_registered
+name: registers_or_registered
+title: Registers or Registered
+description: >-
+  Links a registry or catalog to the entities (datasets, items) it registers.
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  dcat: http://www.w3.org/ns/dcat#
+default_prefix: hc
+imports:
+  - linkml:types
+slots:
+  registers_or_registered:
+    slot_uri: dcat:dataset
+    description: Datasets registered in this catalog/register.
+    range: Dataset
+    multivalued: true
+    inlined: true
+    annotations:
+      custodian_types: ["*"]
+      custodian_types_rationale: "Universal utility concept"