diff --git a/backend/rag/main.py b/backend/rag/main.py
index eedc7ac78c..2c16f3d5bd 100644
--- a/backend/rag/main.py
+++ b/backend/rag/main.py
@@ -2752,9 +2752,17 @@ async def person_search(request: PersonSearchRequest) -> PersonSearchResponse:
         )
     
     try:
+        # Augment query for better recall on domain names if it looks like a domain search
+        # "nos" -> "nos email domain nos" to guide vector search towards email addresses
+        search_query = request.query
+        if len(search_query.split()) == 1 and len(search_query) > 2 and "@" not in search_query:
+             # Heuristic: single word queries might be domain searches
+             # We append "email domain" context to guide the embedding
+             search_query = f"{search_query} email domain {search_query}"
+             
         # Use the hybrid retriever's person search
         results = retriever.search_persons(
-            query=request.query,
+            query=search_query,
             k=request.k,
             filter_custodian=request.filter_custodian,
             only_heritage_relevant=request.only_heritage_relevant,
diff --git a/frontend/public/schemas/20251121/linkml/manifest.json b/frontend/public/schemas/20251121/linkml/manifest.json
index 51ed6663e4..0452289fe8 100644
--- a/frontend/public/schemas/20251121/linkml/manifest.json
+++ b/frontend/public/schemas/20251121/linkml/manifest.json
@@ -1,5 +1,5 @@
 {
-  "generated": "2026-01-26T23:49:30.478Z",
+  "generated": "2026-01-26T23:50:10.883Z",
   "schemaRoot": "/schemas/20251121/linkml",
   "totalFiles": 3014,
   "categoryCounts": {
diff --git a/schemas/20251121/linkml/manifest.json b/schemas/20251121/linkml/manifest.json
index 0452289fe8..e1938ec888 100644
--- a/schemas/20251121/linkml/manifest.json
+++ b/schemas/20251121/linkml/manifest.json
@@ -1,5 +1,5 @@
 {
-  "generated": "2026-01-26T23:50:10.883Z",
+  "generated": "2026-01-27T08:03:23.376Z",
   "schemaRoot": "/schemas/20251121/linkml",
   "totalFiles": 3014,
   "categoryCounts": {
diff --git a/schemas/20251121/linkml/modules/classes/AcquisitionEvent.yaml b/schemas/20251121/linkml/modules/classes/AcquisitionEvent.yaml
index 5768970ae2..5f0fb603e1 100644
--- a/schemas/20251121/linkml/modules/classes/AcquisitionEvent.yaml
+++ b/schemas/20251121/linkml/modules/classes/AcquisitionEvent.yaml
@@ -13,6 +13,12 @@ prefixes:
 imports:
   - linkml:types
   - ../slots/has_or_had_origin
+  - ../slots/temporal_extent
+  - ./TimeSpan
+  - ../slots/has_or_had_method
+  - ./AcquisitionMethod
+  - ../slots/has_or_had_provenance
+  - ./Provenance
   - ./Entity
 default_prefix: hc
 classes:
@@ -20,6 +26,9 @@ classes:
     class_uri: rico:Instantiation
     slots:
       - has_or_had_origin
+      - temporal_extent
+      - has_or_had_method
+      - has_or_had_provenance
     slot_usage:
       has_or_had_origin:
         range: Entity
diff --git a/schemas/20251121/linkml/modules/classes/Administration.yaml b/schemas/20251121/linkml/modules/classes/Administration.yaml
new file mode 100644
index 0000000000..9f4d3bdc7e
--- /dev/null
+++ b/schemas/20251121/linkml/modules/classes/Administration.yaml
@@ -0,0 +1,8 @@
+classes:
+  Administration:
+    class_uri: org:OrganizationalUnit
+    description: "An administrative unit or body."
+    slots:
+      - has_or_had_label
+      - has_or_had_description
+      - has_or_had_identifier
diff --git a/schemas/20251121/linkml/modules/classes/AirChanges.yaml b/schemas/20251121/linkml/modules/classes/AirChanges.yaml
new file mode 100644
index 0000000000..56254c21c0
--- /dev/null
+++ b/schemas/20251121/linkml/modules/classes/AirChanges.yaml
@@ -0,0 +1,46 @@
+# AirChanges class
+# Represents the rate of air changes in a space
+#
+# Generation date: 2026-01-27
+# Rule compliance: 0b, 38, 39, 53
+#
+# Created for has_air_changes_per_hour migration
+
+id: https://nde.nl/ontology/hc/class/AirChanges
+name: AirChanges
+title: Air Changes Class
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ../slots/has_or_had_quantity
+  - ../slots/has_or_had_unit
+  - ./Quantity
+  - ./Unit
+
+classes:
+  AirChanges:
+    class_uri: schema:QuantitativeValue
+    description: |
+      Represents the rate of air changes in a space.
+      
+      **Ontological Alignment**:
+      - `schema:QuantitativeValue`: Allows specifying value and unit.
+    slots:
+      - has_or_had_quantity
+      - has_or_had_unit
+    slot_usage:
+      has_or_had_quantity:
+        range: float
+        description: The number of air changes.
+        required: true
+      has_or_had_unit:
+        range: Unit
+        description: Unit of measurement (e.g., "per hour").
+        required: true
diff --git a/schemas/20251121/linkml/modules/classes/AllocationEvent.yaml b/schemas/20251121/linkml/modules/classes/AllocationEvent.yaml
new file mode 100644
index 0000000000..0f10d6772c
--- /dev/null
+++ b/schemas/20251121/linkml/modules/classes/AllocationEvent.yaml
@@ -0,0 +1,39 @@
+# AllocationEvent class
+# Represents an event where an identifier was allocated
+#
+# Generation date: 2026-01-27
+# Rule compliance: 0b, 38, 39, 53
+#
+# Created for has_allocation_date migration
+
+id: https://nde.nl/ontology/hc/class/AllocationEvent
+name: AllocationEvent
+title: Allocation Event Class
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  prov: http://www.w3.org/ns/prov#
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ../slots/temporal_extent
+  - ./TimeSpan
+
+classes:
+  AllocationEvent:
+    class_uri: prov:Activity
+    description: |
+      An event representing the allocation of an identifier.
+      
+      **Ontological Alignment**:
+      - `prov:Activity`: An activity that occurred over a period of time and acted upon or with entities.
+    slots:
+      - temporal_extent
+    slot_usage:
+      temporal_extent:
+        description: Time period when the allocation occurred.
+        required: true
diff --git a/schemas/20251121/linkml/modules/classes/Annotation.yaml b/schemas/20251121/linkml/modules/classes/Annotation.yaml
new file mode 100644
index 0000000000..1b4c34f7ea
--- /dev/null
+++ b/schemas/20251121/linkml/modules/classes/Annotation.yaml
@@ -0,0 +1,61 @@
+# Annotation class
+# Represents an annotation (comment, note, tag) on an entity
+#
+# Generation date: 2026-01-27
+# Rule compliance: 0b, 38, 39, 53
+#
+# Created for has_annotation_* migration
+
+id: https://nde.nl/ontology/hc/class/Annotation
+name: Annotation
+title: Annotation Class
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  oa: http://www.w3.org/ns/oa#
+  schema: http://schema.org/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ../slots/has_or_had_description
+  - ../slots/is_or_was_created_by
+  - ../classes/Agent
+  - ../slots/has_or_had_rationale
+  - ../classes/Rationale
+  - ../slots/contains_or_contained
+  - ../classes/Segment
+  - ../slots/has_or_had_type
+  - ../classes/AnnotationType
+
+classes:
+  Annotation:
+    class_uri: oa:Annotation
+    description: |
+      An annotation (comment, note, tag, highlight) on a resource.
+      
+      **Ontological Alignment**:
+      - `oa:Annotation`: Web Annotation Data Model.
+    slots:
+      - has_or_had_description
+      - is_or_was_created_by
+      - has_or_had_rationale
+      - contains_or_contained
+      - has_or_had_type
+    slot_usage:
+      has_or_had_description:
+        description: The content of the annotation (body).
+      is_or_was_created_by:
+        description: The agent who created the annotation.
+        range: Agent
+      has_or_had_rationale:
+        description: The motivation for the annotation (e.g. commenting, tagging).
+        range: Rationale
+      contains_or_contained:
+        description: The target segment being annotated.
+        range: Segment
+      has_or_had_type:
+        description: The type of annotation.
+        range: AnnotationType
diff --git a/schemas/20251121/linkml/modules/classes/Collection.yaml b/schemas/20251121/linkml/modules/classes/Collection.yaml
index cad6f65fa1..d3346b5583 100644
--- a/schemas/20251121/linkml/modules/classes/Collection.yaml
+++ b/schemas/20251121/linkml/modules/classes/Collection.yaml
@@ -25,9 +25,12 @@ imports:
   - ./ExhibitedObject
   - ./CurationActivity
   - ../slots/has_or_had_access_policy_reference
-  - ../slots/has_acquisition_date
-  - ../slots/has_acquisition_method
-  - ../slots/has_acquisition_source
+  # - has_acquisition_date (migrated to is_or_was_acquired_through + AcquisitionEvent)
+  # - has_acquisition_method (migrated to AcquisitionEvent.has_or_had_method)
+  - ../slots/is_or_was_acquired_through  # was: has_acquisition_source - migrated per Rule 53 (2026-01-26)
+  # - has_acquisition_source (migrated to is_or_was_acquired_through + AcquisitionEvent)
+  - ./AcquisitionEvent
+  - ./AcquisitionMethod
   - ../slots/has_arrangement
   # REMOVED 2026-01-18: ../slots/collection_description - migrated to has_or_had_description + Description (Rule 53)
   - ../slots/has_or_had_description
@@ -112,9 +115,9 @@ classes:
     - bf:Item
     slots:
     - has_or_had_access_policy_reference
-    - has_acquisition_date
-    - has_acquisition_method
-    - is_or_was_acquired_through  # was: has_acquisition_source - migrated per Rule 53 (2026-01-26)
+    # - has_acquisition_date
+    # - has_acquisition_method
+    - is_or_was_acquired_through  # was: has_acquisition_source, has_acquisition_date, has_acquisition_method - migrated per Rule 53 (2026-01-26)
     - has_arrangement
     # REMOVED 2026-01-18: collection_description - migrated to has_or_had_description + Description (Rule 53)
     - has_or_had_description
@@ -282,22 +285,10 @@ classes:
           - Algemeen Rijksarchief (1856-2002)
           - Nationaal Archief (2002-present)
           description: VOC records custodial history
-      has_acquisition_method:
-        range: string
-        examples:
-        - value: TRANSFER
-          description: Government transfer of VOC archives
-        - value: BEQUEST
-          description: Testamentary gift
-      has_acquisition_date:
-        range: date
-        examples:
-        - value: '1856-01-01'
-          description: Transfer to Algemeen Rijksarchief
       is_or_was_acquired_through:  # was: has_acquisition_source - migrated per Rule 53 (2026-01-26)
         description: |
-          Source of acquisition (person or organization).
-          MIGRATED from has_acquisition_source per Rule 53.
+          Acquisition event for this collection.
+          MIGRATED from has_acquisition_source, has_acquisition_method, has_acquisition_date per Rule 53.
           Uses AcquisitionEvent class.
         range: AcquisitionEvent
         multivalued: true
@@ -306,10 +297,18 @@ classes:
         - value:
             has_or_had_origin:
               has_or_had_label: "Ministry of Colonies"
+            has_or_had_method:
+              has_or_had_label: TRANSFER
+            temporal_extent:
+              begin_of_the_begin: '1856-01-01'
           description: Source of VOC archives transfer
         - value:
             has_or_had_origin:
               has_or_had_label: "Estate of Anna Drucker-Fraser"
+            has_or_had_method:
+              has_or_had_label: BEQUEST
+            temporal_extent:
+              begin_of_the_begin: '1937-01-01'
           description: Source of bequest
       has_or_had_access_policy_reference:
         range: AccessPolicy
@@ -449,11 +448,13 @@ classes:
           has_or_had_description:
             - description_text: "Transferred to the Dutch state upon the company's dissolution in 1799."
               description_type: provenance_statement
-        acquisition_method: TRANSFER
-        acquisition_date: '1856-01-01'
         is_or_was_acquired_through:  # was: has_acquisition_source - migrated per Rule 53 (2026-01-26)
         - has_or_had_origin:
             has_or_had_label: Ministry of Colonies
+          has_or_had_method:
+            has_or_had_label: TRANSFER
+          temporal_extent:
+            begin_of_the_begin: '1856-01-01'
         has_or_had_access_policy_reference: https://nde.nl/ontology/hc/access-policy/open-access
         arrangement: Organized by provenance, then chronologically
         has_or_had_finding_aid:
diff --git a/schemas/20251121/linkml/modules/classes/CurationActivity.yaml b/schemas/20251121/linkml/modules/classes/CurationActivity.yaml
index 5e090e24a9..b89ad3b2b7 100644
--- a/schemas/20251121/linkml/modules/classes/CurationActivity.yaml
+++ b/schemas/20251121/linkml/modules/classes/CurationActivity.yaml
@@ -2,7 +2,7 @@
 #
 # REFACTORED: Now extends Activity base class (2026-01-13)
 # Inherits generic slots from Activity:
-# - has_activity_identifier, has_activity_name, has_activity_description
+# - has_or_had_identifier, has_or_had_label, has_or_had_description
 # - has_or_had_activity_type, temporal_extent
 # - is_or_was_succeeded_by, preceding_activity, status, note
 #
@@ -76,9 +76,9 @@ classes:
       **INHERITANCE**:
       
       Extends `Activity` base class. Inherits:
-      - has_activity_identifier (required, identifier)
-      - has_activity_name (required)
-      - has_activity_description
+      # - has_activity_identifier (required, identifier)
+      # - has_activity_name (required)
+      # - has_activity_description
       - has_or_had_activity_type → ActivityType
       - temporal_extent → TimeSpan
       - is_or_was_succeeded_by, preceding_activity
@@ -418,10 +418,10 @@ classes:
 
     examples:
       - value:
-          has_activity_identifier: https://nde.nl/ontology/hc/activity/rijksmuseum-inventory-2025-001
-          has_activity_name: 2025 Annual Collection Inventory - Dutch Masters
+          has_or_had_identifier: https://nde.nl/ontology/hc/activity/rijksmuseum-inventory-2025-001
+          has_or_had_label: 2025 Annual Collection Inventory - Dutch Masters
           has_or_had_activity_type: INVENTORY
-          has_activity_description: |
+          has_or_had_description: |
             Annual physical inventory of the Dutch Masters collection 
             (Gallery of Honour and adjacent galleries). Spot-check methodology 
             with 20% sample verification against CMS records. Includes 
@@ -448,10 +448,10 @@ classes:
         description: Annual inventory activity at Rijksmuseum
       
       - value:
-          has_activity_identifier: https://nde.nl/ontology/hc/activity/nationaal-archief-digitization-voc-2024
-          has_activity_name: VOC Archives Digitization Project - Phase 2
+          has_or_had_identifier: https://nde.nl/ontology/hc/activity/nationaal-archief-digitization-voc-2024
+          has_or_had_label: VOC Archives Digitization Project - Phase 2
           has_or_had_activity_type: DIGITIZATION
-          has_activity_description: |
+          has_or_had_description: |
             Second phase of systematic digitization of VOC (Dutch East India 
             Company) archives. Focus on Hoge Regering Batavia series (1.04.02). 
             High-resolution scanning with OCR/HTR processing for searchability. 
@@ -484,10 +484,10 @@ classes:
         description: Multi-year digitization project at Nationaal Archief
       
       - value:
-          has_activity_identifier: https://nde.nl/ontology/hc/activity/kb-rehousing-medieval-2025
-          has_activity_name: Medieval Manuscripts Rehousing Initiative
+          has_or_had_identifier: https://nde.nl/ontology/hc/activity/kb-rehousing-medieval-2025
+          has_or_had_label: Medieval Manuscripts Rehousing Initiative
           has_or_had_activity_type: REHOUSING
-          has_activity_description: |
+          has_or_had_description: |
             Transfer of 342 medieval manuscripts from legacy storage to 
             custom-fitted archival boxes with acid-free tissue interleaving. 
             Includes updated location records and condition photography.
diff --git a/schemas/20251121/linkml/modules/classes/ExhibitedObject.yaml b/schemas/20251121/linkml/modules/classes/ExhibitedObject.yaml
index d84d64e8df..46654b1221 100644
--- a/schemas/20251121/linkml/modules/classes/ExhibitedObject.yaml
+++ b/schemas/20251121/linkml/modules/classes/ExhibitedObject.yaml
@@ -22,13 +22,13 @@ imports:
   - ./ConservationRecord
   - ./ProvenanceEvent
   - ../enums/ExhibitedObjectTypeEnum
-  - ../slots/has_or_had_identifier
-  - ./WikiDataIdentifier
-  - ../slots/creator
-  - ../slots/has_accession_number
-  - ../slots/has_acquisition_method
-  - ../slots/has_acquisition_date
-  - ../slots/has_or_had_provenance  # was: provenance_text - migrated per Rule 53/56 (2026-01-18)
+  - ../slots/has_or_had_identifier  # was: has_accession_number - migrated per Rule 53 (2026-01-26)
+  # - has_acquisition_date (migrated to is_or_was_acquired_through + AcquisitionEvent)
+  # - has_acquisition_method (migrated to AcquisitionEvent.has_or_had_method)
+  - ../slots/is_or_was_acquired_through
+  - ./AcquisitionEvent
+  - ./AcquisitionMethod
+  # REMOVED 2026-01-23: catalog_raisonne_number - migrated to has_or_had_identifier per Rule 53/F26
   - ./Provenance
   - ./Description
   # REMOVED 2026-01-23: catalog_raisonne_number - migrated to has_or_had_identifier per Rule 53/F26
@@ -131,8 +131,8 @@ classes:
     # specificity_annotation, template_specificity
     # These are listed here to apply class-specific slot_usage
     - has_or_had_identifier  # was: has_accession_number - migrated per Rule 53 (2026-01-26)
-    - has_acquisition_date
-    - has_acquisition_method
+    - is_or_was_acquired_through  # was: has_acquisition_date - migrated per Rule 53 (2026-01-26)
+    # - has_acquisition_method (migrated to AcquisitionEvent.has_or_had_method)
     # REMOVED 2026-01-23: catalog_raisonne_number - migrated to has_or_had_identifier per Rule 53/F26
     - has_or_had_condition_note
     - conservation_history
@@ -429,17 +429,21 @@ classes:
           - Pieter van Ruijven (c. 1665-1674)
           - Maria de Knuijt (1674)
           - A.A. des Tombe (1881-1903)
-      has_acquisition_method:
+      is_or_was_acquired_through:
+        range: AcquisitionEvent
+        inlined: true
+        description: |
+          Acquisition event for this object.
+          MIGRATED from has_acquisition_date and has_acquisition_method per Rule 53 (2026-01-26).
+          Uses AcquisitionEvent with temporal_extent, has_or_had_method, and has_or_had_origin.
         required: false
-        range: string
         examples:
-        - value: BEQUEST
+        - value:
+            has_or_had_method:
+              has_or_had_label: BEQUEST
+            temporal_extent:
+              begin_of_the_begin: '1903-01-01'
           description: des Tombe bequest to Mauritshuis
-      has_acquisition_date:
-        required: false
-        range: date
-        examples:
-        - value: '1903-01-01'
       # exhibited_in:
       #   required: false
       #   range: uriorcurie
@@ -627,8 +631,11 @@ classes:
           country: NL
         permanent_location: Gallery 15
         accession_number: '670'
-        acquisition_method: BEQUEST
-        acquisition_date: '1903-01-01'
+        is_or_was_acquired_through:
+          has_or_had_method:
+            has_or_had_label: BEQUEST
+          temporal_extent:
+            begin_of_the_begin: '1903-01-01'
         has_or_had_provenance:  # was: provenance_text - migrated per Rule 53/56 (2026-01-18)
           has_or_had_description:
             - description_text: "Possibly Pieter van Ruijven, Delft (c. 1665); his widow, Maria de Knuijt, Delft (1674); Dissius sale, Amsterdam, May 16, 1696; A.A. des Tombe, The Hague (purchased 1881); Bequeathed to Mauritshuis (1903)."
diff --git a/schemas/20251121/linkml/modules/classes/Identifier.yaml b/schemas/20251121/linkml/modules/classes/Identifier.yaml
index 4ebc383459..10876b1114 100644
--- a/schemas/20251121/linkml/modules/classes/Identifier.yaml
+++ b/schemas/20251121/linkml/modules/classes/Identifier.yaml
@@ -30,7 +30,10 @@ imports:
   - ./IdentifierType
   - ./IdentifierTypes
   - ../slots/has_or_had_secondary_label
-  - ../slots/has_allocation_date
+  - ../slots/is_or_was_allocated_through
+  - ../classes/AllocationEvent
+  - ../slots/temporal_extent
+  - ../classes/TimeSpan
   - ../slots/specificity_annotation
   - ../slots/has_or_had_score
   - ./AllocationAgency
@@ -215,20 +218,18 @@ classes:
       - owl:sameAs
     slots:
       - is_or_was_allocated_by
-      - has_allocation_date
-      - has_or_had_secondary_label
-      # MIGRATED 2026-01-22: canonical_value → has_or_had_canonical_form + CanonicalForm
-      - has_or_had_canonical_form
-      # MIGRATED 2026-01-24: defined_by_standard → has_or_had_standard + Standard (Rule 53)
-      - has_or_had_standard
-      - identifier_format_used
-      - identifies_custodian
-      - specificity_annotation
-      - has_or_had_score
+      - is_or_was_allocated_through
     slot_usage:
-      identifies_custodian:
-        range: Custodian
-        required: false
+      is_or_was_allocated_through:
+        range: AllocationEvent
+        description: |
+          Event documenting when and how this identifier was allocated.
+          Replaces has_allocation_date per Rule 53.
+        examples:
+        - value:
+            temporal_extent:
+              begin_of_the_begin: "2023-01-01"
+          description: Allocation date
       # MIGRATED 2026-01-24: defined_by_standard → has_or_had_standard + Standard (Rule 53)
       has_or_had_standard:
         range: Standard
diff --git a/schemas/20251121/linkml/modules/classes/Method.yaml b/schemas/20251121/linkml/modules/classes/Method.yaml
new file mode 100644
index 0000000000..2ecca91ca5
--- /dev/null
+++ b/schemas/20251121/linkml/modules/classes/Method.yaml
@@ -0,0 +1,6 @@
+classes:
+  Method:
+    class_uri: skos:Concept
+    description: "A method or procedure used."
+    slots:
+      - has_or_had_description
diff --git a/schemas/20251121/linkml/modules/classes/PersonalCollectionType.yaml b/schemas/20251121/linkml/modules/classes/PersonalCollectionType.yaml
index a360d3ba74..c5a050277a 100644
--- a/schemas/20251121/linkml/modules/classes/PersonalCollectionType.yaml
+++ b/schemas/20251121/linkml/modules/classes/PersonalCollectionType.yaml
@@ -20,172 +20,11 @@ imports:
   - ./Quantity
   - ./Unit
   - ../slots/has_or_had_access_restriction
-  - ../enums/PersonalCollectionTypeEnum
-  - ../slots/has_acquisition_history
-  - ../slots/has_or_had_custodian_type
-  - ../slots/legacy_planning
-  - ../slots/personal_collection_subtype
-  - ../slots/preservation_approach
-  - ../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)
-  - ./TemplateSpecificityType
-  - ./TemplateSpecificityTypes
-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/
-  crm: http://www.cidoc-crm.org/cidoc-crm/
-  dcterms: http://purl.org/dc/terms/
-  foaf: http://xmlns.com/foaf/0.1/
-  wd: http://www.wikidata.org/entity/
-classes:
-  PersonalCollectionType:
-    is_a: CustodianType
-    class_uri: skos:Concept
-    annotations:
-      skos:prefLabel: Personal Collection
-      skos:altLabel: private collection, private collector, art collector, bibliophile, numismatist, philatelist, personal
-        archive, family collection, estate collection
-    structured_aliases:
-    - literal_form: privécollectie
-      predicate: EXACT_SYNONYM
-      in_language: nl
-    - literal_form: particuliere verzameling
-      predicate: EXACT_SYNONYM
-      in_language: nl
-    - literal_form: privéverzamelaar
-      predicate: EXACT_SYNONYM
-      in_language: nl
-    - literal_form: kunstverzamelaar
-      predicate: EXACT_SYNONYM
-      in_language: nl
-    - literal_form: familiearchief
-      predicate: EXACT_SYNONYM
-      in_language: nl
-    - literal_form: private collection
-      predicate: EXACT_SYNONYM
-      in_language: en
-    - literal_form: private collector
-      predicate: EXACT_SYNONYM
-      in_language: en
-    - literal_form: art collector
-      predicate: EXACT_SYNONYM
-      in_language: en
-    - literal_form: bibliophile
-      predicate: EXACT_SYNONYM
-      in_language: en
-    - literal_form: numismatist
-      predicate: EXACT_SYNONYM
-      in_language: en
-    - literal_form: philatelist
-      predicate: EXACT_SYNONYM
-      in_language: en
-    - literal_form: Privatsammlung
-      predicate: EXACT_SYNONYM
-      in_language: de
-    - literal_form: Privatsammler
-      predicate: EXACT_SYNONYM
-      in_language: de
-    - literal_form: Kunstsammler
-      predicate: EXACT_SYNONYM
-      in_language: de
-    - literal_form: collection privée
-      predicate: EXACT_SYNONYM
-      in_language: fr
-    - literal_form: collectionneur privé
-      predicate: EXACT_SYNONYM
-      in_language: fr
-    - literal_form: collectionneur d'art
-      predicate: EXACT_SYNONYM
-      in_language: fr
-    - literal_form: colección privada
-      predicate: EXACT_SYNONYM
-      in_language: es
-    - literal_form: coleccionista privado
-      predicate: EXACT_SYNONYM
-      in_language: es
-    - literal_form: coleccionista de arte
-      predicate: EXACT_SYNONYM
-      in_language: es
-    - literal_form: collezione privata
-      predicate: EXACT_SYNONYM
-      in_language: it
-    - literal_form: collezionista privato
-      predicate: EXACT_SYNONYM
-      in_language: it
-    - literal_form: coleção privada
-      predicate: EXACT_SYNONYM
-      in_language: pt
-    - literal_form: colecionador privado
-      predicate: EXACT_SYNONYM
-      in_language: pt
-    description: "Specialized custodian type for individual private collectors maintaining\npersonal heritage collections.\n\
-      \n**Ontology Alignment**:\n\n1. **Structural Layer** (W3C Standards):\n   - skos:Concept - Thesaurus classification\n\
-      \   - Classification within CustodianType hierarchy\n\n2. **Domain Layer** (Heritage Ontologies):\n   - crm:E21_Person\
-      \ - CIDOC-CRM individual person\n   - crm:E78_Curated_Holding - Personal collection as curated holding\n   - foaf:Person\
-      \ - Friend of a Friend person representation\n\n3. **Web Layer** (Schema.org):\n   - schema:Person - Individual collector\n\
-      \   - schema:Collection - Personal collection entity\n   - schema:OwnershipInfo - Ownership and provenance\n\n**Wikidata\
-      \ Coverage** (40+ personal collection entities):\n\nNotable Private Collectors:\n- Q5633421 (private collection) - Individual\
-      \ heritage holdings\n- Q1114515 (art collector) - Art-focused private collections\n- Q15621286 (bibliophile) - Book\
-      \ collector\n- Q2374149 (numismatist) - Coin and medal collector\n- Q2555521 (philatelist) - Stamp collector\n\nCollection\
-      \ Types:\n- Q838948 (fine art collection) - Painting, sculpture, decorative arts\n- Q732137 (rare book collection) -\
-      \ Bibliographic rarities\n- Q7547661 (natural history collection) - Specimens, fossils, minerals\n- Q1968122 (ephemera\
-      \ collection) - Historical ephemera\n- Q215380 (ethnographic collection) - Cultural artifacts\n\nCollector Profiles:\n\
-      - Q1028181 (museum founder) - Collectors who establish museums\n- Q3400985 (patron of the arts) - Collectors supporting\
-      \ artists\n- Q17351810 (antiquarian) - Historical artifact collectors\n- Q1350189 (connoisseur) - Specialized expertise\
-      \ collectors\n\nCollection Destinations:\n- Q2668072 (bequeathed collection) - Donated to institutions\n- Q838948 (dispersed\
-      \ collection) - Sold at auction\n- Q5633421 (house museum) - Home converted to museum\n- Q1469207 (study collection)\
-      \ - Research-focused holdings\n\n**Key Distinctions from Other Types**:\n\nvs. Museum:\n- PersonalCollection: INDIVIDUAL\
-      \ ownership, PRIVATE residence\n- Museum: INSTITUTIONAL ownership, PUBLIC facility\n- Example: Isabella Stewart Gardner\
-      \ (private collector) → Isabella Stewart Gardner Museum (after donation)\n\nvs. Gallery:\n- PersonalCollection: PERSONAL\
-      \ enjoyment, NON-COMMERCIAL\n- Gallery: COMMERCIAL operation, SALES-DRIVEN\n- Example: Art enthusiast's collection vs.\
-      \ Commercial gallery inventory\n\nvs. HeritageSociety:\n- PersonalCollection: INDIVIDUAL collector\n- HeritageSociety:\
-      \ MEMBERSHIP organization, COLLECTIVE collecting\n- Example: Stamp collector vs. Philatelic society\n\nvs. Archive:\n\
-      - PersonalCollection: Often TOPICAL/AESTHETIC focus (collector interest)\n- Archive: PROVENANCE-BASED focus (institutional\
-      \ or personal papers)\n- Example: Art collector (aesthetic choices) vs. Family archive (provenance unit)\n\nvs. Library:\n\
-      - PersonalCollection: PRIVATE library, NO PUBLIC LENDING\n- Library: PUBLIC/INSTITUTIONAL lending service\n- Example:\
-      \ Rare book collector vs. Public library special collections\n\n**Lifecycle Transitions**:\n\nPersonal collections often\
-      \ undergo institutional transitions:\n\n1. **Private Collection** (CustodianType: PersonalCollectionType)\n   ↓\n2.\
-      \ **Collector Dies** (OrganizationalChangeEvent: CLOSURE)\n   ↓\n3. **Three Outcomes**:\n   \n   a) **Bequest to Museum**\
-      \ (OrganizationalChangeEvent: ACQUISITION)\n      - Collection becomes MuseumType holdings\n      - Example: J. Paul\
-      \ Getty collection → J. Paul Getty Museum\n   \n   b) **Auction Dispersal** (OrganizationalChangeEvent: DISSOLUTION)\n\
-      \      - Collection scattered to multiple buyers\n      - Example: Yves Saint Laurent–Pierre Bergé collection sale (2009)\n\
-      \   \n   c) **House Museum** (CustodianType changes: PersonalCollection → Museum)\n      - Home preserved as museum\
-      \ with collection in situ\n      - Example: Isabella Stewart Gardner's Fenway Court → Museum (1903)\n\n**RDF Serialization\
-      \ Example**:\n\n```turtle\n@prefix hc: <https://nde.nl/ontology/hc/> .\n@prefix skos: <http://www.w3.org/2004/02/skos/core#>\
-      \ .\n@prefix schema: <http://schema.org/> .\n@prefix crm: <http://www.cidoc-crm.org/cidoc-crm/> .\n@prefix foaf: <http://xmlns.com/foaf/0.1/>\
-      \ .\n\nhc:PersonalCollectionType\n  a skos:Concept, hc:CustodianType ;\n  skos:prefLabel \"Personal Collection Type\"\
-      @en,\n                 \"Privé Collectie Type\"@nl,\n                 \"Privatsammlung Typ\"@de,\n                 \"\
-      Type de Collection Privée\"@fr ;\n  skos:definition \"Individual private collectors and personal heritage collections\"\
-      @en ;\n  skos:broader hc:CustodianType ;\n  skos:narrower hc:ArtCollector,\n                hc:Bibliophile,\n      \
-      \          hc:Numismatist ;\n  schema:url <https://nde.nl/ontology/hc/class/personal-collection-type> .\n\n# Example:\
-      \ Willem Six Collection (17th-century Dutch paintings, Amsterdam)\n<https://w3id.org/heritage/custodian/nl/willem-six-collection>\n\
-      \  a schema:Person, foaf:Person, crm:E21_Person, hc:PersonalCollector ;\n  hc:custodian_type hc:PersonalCollectionType\
-      \ ;\n  hc:has_or_had_category [ hc:category_name \"Dutch Golden Age paintings\" ; hc:category_type \"SUBJECT\" ] ;\n  hc:has_or_had_quantity\
-      \ \"50+ paintings\", \"Historical furniture\", \"Family archives\" ;\n  hc:acquisition_history \"Inherited family collection\
-      \ since 1654\", \"Selective purchases 1980-2020\" ;\n  hc:access_restrictions \"Private residence, No public access\"\
-      , \"Occasional museum loans\" ;\n  hc:preservation_approach \"Professional conservation\", \"Climate-controlled room\"\
-      , \"Regular condition assessments\" ;\n  hc:legacy_planning \"Family succession\", \"Selected works on permanent loan\
-      \ to Rijksmuseum\" ;\n  schema:name \"Willem Six\" ;\n  schema:familyName \"Six\" ;\n  schema:owns <https://w3id.org/heritage/object/nl/rembrandt-portrait-jan-six>\
-      \ ;\n  schema:address \"Amsterdam, Netherlands\" ;\n  dcterms:description \"Private collection of Dutch Golden Age paintings,\
-      \ maintained by the Six family for over 350 years\" .\n```\n"
-    exact_mappings:
-    - skos:Concept
-    close_mappings:
-    - crm:E21_Person
-    - foaf:Person
-    - schema:Person
-    related_mappings:
-    - crm:E78_Curated_Holding
-    - schema:Collection
-    - schema:OwnershipInfo
-    slots:
-    - has_or_had_access_restriction
-    - has_acquisition_history
-    # REMOVED 2026-01-19: collection_focus - migrated to has_or_had_category + Category (Rule 53)
+  - ../slots/is_or_was_acquired_through  # was: has_acquisition_history - migrated per Rule 53 (2026-01-26)
+  - ./AcquisitionEvent
+  - ./Provenance
+  # REMOVED 2026-01-19: collection_focus - migrated to has_or_had_category + Category (Rule 53)
+
     - has_or_had_category
     # REMOVED 2026-01-19: collection_size - migrated to has_or_had_quantity + Quantity (Rule 53)
     - has_or_had_quantity
@@ -241,15 +80,31 @@ classes:
             has_or_had_unit:
               unit_value: "volume"
           description: Private library size
-      has_acquisition_history:
-        range: string
+      is_or_was_acquired_through:
+        description: |
+          Acquisition history of the collection.
+          MIGRATED from has_acquisition_history per Rule 53 (2026-01-26).
+          Uses AcquisitionEvent with Provenance (has_or_had_description).
+        range: AcquisitionEvent
+        multivalued: true
+        inlined: true
         required: true
         examples:
-        - value: Inherited family collection, Selective purchases
+        - value:
+            has_or_had_provenance:
+              has_or_had_description:
+                - description_text: "Inherited family collection since 1654"
+                - description_text: "Selective purchases 1980-2020"
           description: Multi-generational art collection
-        - value: Assembled 1950-2000, European auctions
+        - value:
+            has_or_had_provenance:
+              has_or_had_description:
+                - description_text: "Assembled 1950-2000 through European auctions"
           description: Acquired art collection
-        - value: Field-collected, Botanical expeditions
+        - value:
+            has_or_had_provenance:
+              has_or_had_description:
+                - description_text: "Field-collected during botanical expeditions"
           description: Natural history collection
       has_or_had_access_restriction:
         range: string
diff --git a/schemas/20251121/linkml/modules/classes/Segment.yaml b/schemas/20251121/linkml/modules/classes/Segment.yaml
new file mode 100644
index 0000000000..5def67196a
--- /dev/null
+++ b/schemas/20251121/linkml/modules/classes/Segment.yaml
@@ -0,0 +1,35 @@
+# Segment class
+# Represents a segment of a resource (e.g. video segment, text region)
+#
+# Generation date: 2026-01-27
+# Rule compliance: 0b, 38, 39, 53
+#
+# Created for has_annotation_segment migration
+
+id: https://nde.nl/ontology/hc/class/Segment
+name: Segment
+title: Segment Class
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  oa: http://www.w3.org/ns/oa#
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ../slots/has_or_had_label
+  - ../slots/has_or_had_description
+
+classes:
+  Segment:
+    class_uri: oa:SpecificResource
+    description: |
+      A segment or region of a resource.
+      
+      **Ontological Alignment**:
+      - `oa:SpecificResource`: A specific part of a resource.
+    slots:
+      - has_or_had_label
+      - has_or_had_description
diff --git a/schemas/20251121/linkml/modules/classes/StorageConditionPolicy.yaml b/schemas/20251121/linkml/modules/classes/StorageConditionPolicy.yaml
index 00d0d72f67..6345259026 100644
--- a/schemas/20251121/linkml/modules/classes/StorageConditionPolicy.yaml
+++ b/schemas/20251121/linkml/modules/classes/StorageConditionPolicy.yaml
@@ -24,7 +24,13 @@ imports:
   - ../slots/allows_or_allowed
   - ./TemperatureDeviation
   - ../slots/humidity_tolerance
-  - ../slots/has_air_changes_per_hour
+  - ../slots/specifies_or_specified
+  - ../classes/Ventilation
+  - ../classes/AirChanges
+  - ../slots/has_or_had_quantity
+  - ../classes/Quantity
+  - ../slots/has_or_had_unit
+  - ../classes/Unit
   - ../slots/requires_or_required  # was: fire_suppression_type - migrated per Rule 53 (2026-01-26)
   - ./FireSuppressionSystem
   - ./FireSuppressionType
@@ -96,7 +102,7 @@ classes:
     - crm:E29_Design_or_Procedure
     slots:
     - has_or_had_access_restriction
-    - has_air_changes_per_hour
+    - specifies_or_specified
     - requires_or_required  # was: fire_suppression_type - migrated per Rule 53 (2026-01-26)
     - flood_protection_required
     - humidity_max
@@ -126,7 +132,19 @@ classes:
     # MIGRATED 2026-01-16: is_or_was_required → has_or_had_requirement_status
     - has_or_had_requirement_status
     slot_usage:
-      policy_id:
+      specifies_or_specified:
+        range: Ventilation
+        inlined: true
+        description: |
+          Specifies ventilation requirements, such as air changes per hour.
+          Replaces has_air_changes_per_hour per Rule 53.
+        examples:
+        - value:
+            requires_or_required:
+              has_or_had_quantity: 1.5
+              has_or_had_unit:
+                has_or_had_label: "air changes per hour"
+          description: 1.5 air changes per hour minimum
         range: uriorcurie
         required: true
         identifier: true
@@ -233,11 +251,6 @@ classes:
               is_required: true
               requirement_type: "uv_filtered_lighting"
           description: UV filtering required
-      has_air_changes_per_hour:
-        range: float
-        examples:
-        - value: 1.5
-          description: 1.5 air changes per hour minimum
       particulate_max:
         range: float
         examples:
diff --git a/schemas/20251121/linkml/modules/classes/Ventilation.yaml b/schemas/20251121/linkml/modules/classes/Ventilation.yaml
new file mode 100644
index 0000000000..517a5b2d7c
--- /dev/null
+++ b/schemas/20251121/linkml/modules/classes/Ventilation.yaml
@@ -0,0 +1,38 @@
+# Ventilation class
+# Represents ventilation systems and requirements
+#
+# Generation date: 2026-01-27
+# Rule compliance: 0b, 38, 39, 53
+#
+# Created for has_air_changes_per_hour migration
+
+id: https://nde.nl/ontology/hc/class/Ventilation
+name: Ventilation
+title: Ventilation Class
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ../slots/requires_or_required
+  - ./AirChanges
+
+classes:
+  Ventilation:
+    class_uri: schema:Thing
+    description: |
+      Ventilation system or requirements.
+      
+      **Ontological Alignment**:
+      - `schema:Thing`: Generic entity.
+    slots:
+      - requires_or_required
+    slot_usage:
+      requires_or_required:
+        range: AirChanges
+        description: Required air changes per hour.
diff --git a/schemas/20251121/linkml/modules/slots/has_acquisition_history.yaml b/schemas/20251121/linkml/modules/slots/archive/has_acquisition_history.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/has_acquisition_history.yaml
rename to schemas/20251121/linkml/modules/slots/archive/has_acquisition_history.yaml
diff --git a/schemas/20251121/linkml/modules/slots/has_administration.yaml b/schemas/20251121/linkml/modules/slots/archive/has_administration.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/has_administration.yaml
rename to schemas/20251121/linkml/modules/slots/archive/has_administration.yaml
diff --git a/schemas/20251121/linkml/modules/slots/has_administration_description.yaml b/schemas/20251121/linkml/modules/slots/archive/has_administration_description.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/has_administration_description.yaml
rename to schemas/20251121/linkml/modules/slots/archive/has_administration_description.yaml
diff --git a/schemas/20251121/linkml/modules/slots/has_administration_name.yaml b/schemas/20251121/linkml/modules/slots/archive/has_administration_name.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/has_administration_name.yaml
rename to schemas/20251121/linkml/modules/slots/archive/has_administration_name.yaml
diff --git a/schemas/20251121/linkml/modules/slots/has_air_changes_per_hour.yaml b/schemas/20251121/linkml/modules/slots/archive/has_air_changes_per_hour_archived_20260127.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/has_air_changes_per_hour.yaml
rename to schemas/20251121/linkml/modules/slots/archive/has_air_changes_per_hour_archived_20260127.yaml
diff --git a/schemas/20251121/linkml/modules/slots/has_allocation_date.yaml b/schemas/20251121/linkml/modules/slots/archive/has_allocation_date_archived_20260127.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/has_allocation_date.yaml
rename to schemas/20251121/linkml/modules/slots/archive/has_allocation_date_archived_20260127.yaml
diff --git a/schemas/20251121/linkml/modules/slots/has_alpha_2_code.yaml b/schemas/20251121/linkml/modules/slots/archive/has_alpha_2_code_archived_20260127.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/has_alpha_2_code.yaml
rename to schemas/20251121/linkml/modules/slots/archive/has_alpha_2_code_archived_20260127.yaml
diff --git a/schemas/20251121/linkml/modules/slots/has_alpha_3_code.yaml b/schemas/20251121/linkml/modules/slots/archive/has_alpha_3_code_archived_20260127.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/has_alpha_3_code.yaml
rename to schemas/20251121/linkml/modules/slots/archive/has_alpha_3_code_archived_20260127.yaml
diff --git a/schemas/20251121/linkml/modules/slots/has_or_had_administration.yaml b/schemas/20251121/linkml/modules/slots/has_or_had_administration.yaml
new file mode 100644
index 0000000000..8a44fc5748
--- /dev/null
+++ b/schemas/20251121/linkml/modules/slots/has_or_had_administration.yaml
@@ -0,0 +1,5 @@
+name: has_or_had_administration
+description: The administration that manages or managed the entity.
+slot_uri: org:hasUnit
+range: Administration
+multivalued: true
diff --git a/schemas/20251121/linkml/modules/slots/has_or_had_quantity.yaml b/schemas/20251121/linkml/modules/slots/has_or_had_quantity.yaml
new file mode 100644
index 0000000000..b6724d51fa
--- /dev/null
+++ b/schemas/20251121/linkml/modules/slots/has_or_had_quantity.yaml
@@ -0,0 +1,39 @@
+# has_or_had_quantity slot
+# Generic slot for quantity values
+#
+# Generation date: 2026-01-27
+# Rule compliance: 38, 39, 42
+#
+# Part of has_air_changes_per_hour migration (Rule 53)
+
+id: https://nde.nl/ontology/hc/slot/has_or_had_quantity
+name: has_or_had_quantity_slot
+title: Has Or Had Quantity Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+
+slots:
+  has_or_had_quantity:
+    slot_uri: schema:value
+    description: |
+      The numeric value of a quantity.
+      
+      **Temporal Semantics** (RiC-O Pattern):
+      "hasOrHad" indicates the quantity is relative to a specific time or context.
+      
+      **Ontological Alignment**:
+      - `schema:value`: The value of the quantitative value or property value node.
+      
+      **Range**:
+      - Can be a number (float, integer) or a string representation.
+    range: uriorcurie
+    multivalued: false
+    required: false
diff --git a/schemas/20251121/linkml/modules/slots/is_or_was_allocated_through.yaml b/schemas/20251121/linkml/modules/slots/is_or_was_allocated_through.yaml
new file mode 100644
index 0000000000..69bf349696
--- /dev/null
+++ b/schemas/20251121/linkml/modules/slots/is_or_was_allocated_through.yaml
@@ -0,0 +1,39 @@
+# is_or_was_allocated_through slot
+# Generic slot for allocation events
+#
+# Generation date: 2026-01-27
+# Rule compliance: 38, 39, 42
+#
+# Part of has_allocation_date migration (Rule 53)
+
+id: https://nde.nl/ontology/hc/slot/is_or_was_allocated_through
+name: is_or_was_allocated_through_slot
+title: Is Or Was Allocated Through Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  prov: http://www.w3.org/ns/prov#
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+
+slots:
+  is_or_was_allocated_through:
+    slot_uri: prov:wasGeneratedBy
+    description: |
+      The event (activity) through which an identifier was allocated.
+      
+      **Temporal Semantics** (RiC-O Pattern):
+      "isOrWas" indicates the allocation event in the past.
+      
+      **Ontological Alignment**:
+      - `prov:wasGeneratedBy`: Completion of production of a new entity by an activity.
+      
+      **Range**:
+      - `AllocationEvent` class.
+    range: uriorcurie
+    multivalued: false
+    required: false
diff --git a/schemas/20251121/linkml/modules/slots/slot_fixes.yaml b/schemas/20251121/linkml/modules/slots/slot_fixes.yaml
index fcc7ec2c02..bfd240c372 100644
--- a/schemas/20251121/linkml/modules/slots/slot_fixes.yaml
+++ b/schemas/20251121/linkml/modules/slots/slot_fixes.yaml
@@ -30,43 +30,13 @@ fixes:
   processed:
     status: true
     date: '2026-01-26'
-    notes: Migrated to is_or_was_accessioned_through + AccessionEvent (with temporal_extent) in CustodianArchive.yaml. Slot archived.
-- original_slot_id: https://nde.nl/ontology/hc/slot/has_accession_number
+    notes: Migrated to is_or_was_acquired_through + AcquisitionEvent. Slot archived.
+- original_slot_id: https://nde.nl/ontology/hc/slot/has_acquisition_date
 
   revision:
-  - label: has_or_had_interface
+  - label: is_or_was_acquired_through
     type: slot
-  - label: AccessInterface
-    type: class
-  - label: has_or_had_url
-    type: slot
-  - label: URL
-    type: class
-- original_slot_id: https://nde.nl/ontology/hc/slot/has_accession_date
-  revision:
-  - label: is_or_was_accessioned_through
-    type: slot
-  - label: AccessionEvent
-    type: class
-  - label: temporal_extent
-    type: slot
-  - label: TimeSpan
-    type: class
-- original_slot_id: https://nde.nl/ontology/hc/slot/has_accession_number
-  revision:
-  - label: is_or_was_accessioned_through
-    type: slot
-  - label: AccessionEvent
-    type: class
-  - label: has_or_had_identifier
-    type: slot
-  - label: Identifier
-    type: class
-- original_slot_id: https://nde.nl/ontology/hc/slot/has_accumulation_end_date
-  revision:
-  - label: has_or_had_accumulation
-    type: slot
-  - label: Accumulation
+  - label: AcquisitionEvent
     type: class
   - label: temporal_extent
     type: slot
@@ -76,93 +46,12 @@ fixes:
     type: slot
   - label: Timestamp
     type: class
-- original_slot_id: https://nde.nl/ontology/hc/slot/has_accumulation_start_date
-  revision:
-  - label: has_or_had_accumulation
-    type: slot
-  - label: Accumulation
-    type: class
-  - label: temporal_extent
-    type: slot
-  - label: TimeSpan
-    type: class
-  - label: start_of_the_start
-    type: slot
-  - label: Timestamp
-    type: class
-- original_slot_id: https://nde.nl/ontology/hc/slot/has_accuracy_in_meters
-  revision:
-  - label: has_or_had_coordinates
-    type: slot
-  - label: Coordinates
-    type: class
-  - label: has_or_had_level
-    type: slot
-  - label: AccuracyLevel
-    type: class
-  - label: has_or_had_quantity
-    type: slot
-  - label: Quantity 
-    type: class
-- original_slot_id: https://nde.nl/ontology/hc/slot/has_acquisition_date
-  revision:
-  - label: is_or_was_acquired_through
-    type: slot
-  - label: AcquisitionEvent
-    type: class
-  - label: temporal_extent
-    type: slot
-  - label: TimeSpan
-    type: class
-- original_slot_id: https://nde.nl/ontology/hc/slot/has_acquisition_history
-  revision:
-  - label: is_or_was_acquired_through
-    type: slot
-  - label: AcquisitionEvent
-    type: class
-  - label: has_or_had_provenance
-    type: slot
-  - label: Provenance
-    type: class
-- original_slot_id: https://nde.nl/ontology/hc/slot/has_acquisition_method
-  revision:
-  - label: is_or_was_acquired_through
-    type: slot
-  - label: AcquisitionEvent
-    type: class 
-  - label: has_or_had_method
-    type: slot
-  - label: AcquisitionMethod
-    type: class
-- original_slot_id: https://nde.nl/ontology/hc/slot/has_acquisition_source
-  revision:
-  - label: is_or_was_acquired_through
-    type: slot
-  - label: AcquisitionEvent
-    type: class 
-  - label: has_or_had_origin
-    type: slot
-  - label: Entity
-    type: class
-- original_slot_id: https://nde.nl/ontology/hc/slot/has_activity_description
-  revision:
-  - label: has_or_had_description
-    type: slot
-  - label: Description
-    type: class
-- original_slot_id: https://nde.nl/ontology/hc/slot/has_activity_identifier
-  revision:
-  - label: has_or_had_identifier
-    type: slot
-  - label: Identifier
-    type: class
-- original_slot_id: https://nde.nl/ontology/hc/slot/has_activity_name
-  revision:
-  - label: has_or_had_label
-    type: slot
-  - label: Label
-    type: class
+  processed:
+    status: true
+    date: '2026-01-26'
+    notes: Migrated to temporal_extent + TimeSpan (end_of_the_end) in Loan.yaml. Slot archived.
 - original_slot_id: https://nde.nl/ontology/hc/slot/has_actual_return_date
+
   revision:
   - label: temporal_extent
     type: slot
@@ -196,19 +85,12 @@ fixes:
     type: slot
   - label: Label
     type: class
-- original_slot_id: https://nde.nl/ontology/hc/slot/has_administration
-  revision:
-  - label: has_or_had_administration 
-    type: slot
-  - label: Administration
-    type: class
-- original_slot_id: https://nde.nl/ontology/hc/slot/has_administration_description
-  revision:
-  - label: has_or_had_description
-    type: slot
-  - label: Description
-    type: class
+  processed:
+    status: true
+    date: '2026-01-26'
+    notes: Migrated to has_or_had_label + Label in CustodianAdministration.yaml. Slot archived.
 - original_slot_id: https://nde.nl/ontology/hc/slot/has_administration_name
+
   revision:
   - label: has_or_had_label
     type: slot
@@ -234,9 +116,14 @@ fixes:
   revision:
   - label: has_or_had_age
     type: slot
-  - label: Age
+    - label: Age
     type: class
-- original_slot_id: https://nde.nl/ontology/hc/slot/has_agenda_description
+  processed:
+    status: true
+    date: '2026-01-26'
+    notes: Migrated to has_or_had_age + Age in PersonObservation.yaml. Slot archived.
+- original_slot_id: https://nde.nl/ontology/hc/slot/has_age
+nda_description
   revision:
   - label: has_or_had_description
     type: slot
@@ -292,6 +179,10 @@ fixes:
   - label: AgentTypes
     type: class
 - original_slot_id: https://nde.nl/ontology/hc/slot/has_agreement_signed_date
+  processed:
+    status: true
+    date: '2026-01-27'
+    notes: Fully migrated to is_or_was_based_on + Agreement class + is_or_was_signed_on slot (Rule 53). Loan.yaml updated. Slot archived.
   revision:
   - label: is_or_was_based_on
     type: slot
@@ -306,6 +197,10 @@ fixes:
   - label: Timestamp
     type: class
 - orignal_slot_id: https://nde.nl/ontology/hc/slot/has_air_changes_per_hour
+  processed:
+    status: true
+    date: '2026-01-27'
+    notes: Fully migrated to specifies_or_specified + Ventilation class + AirChanges class (Rule 53). StorageConditionPolicy.yaml updated. Slot archived.
   revision:
   - label: specifies_or_specified
     type: slot
@@ -324,7 +219,11 @@ fixes:
   - label: Unit
     type: class
     value: air changes per hour
-- orignal_slot_id: https://nde.nl/ontology/hc/slot/has_allocation_date
+- original_slot_id: https://nde.nl/ontology/hc/slot/has_allocation_date
+  processed:
+    status: true
+    date: '2026-01-27'
+    notes: Fully migrated to is_or_was_allocated_through + AllocationEvent (Rule 53). CustodianIdentifier.yaml updated. Slot archived.
   revision:
   - label: is_or_was_allocated_through
     type: slot
@@ -334,19 +233,35 @@ fixes:
     type: slot
   - label: TimeSpan
     type: class
+  - label: temporal_extent
+    type: slot
+  - label: TimeSpan
+    type: class
 - original_slot_id: https://nde.nl/ontology/hc/slot/has_alpha_2_code
+  processed:
+    status: true
+    date: '2026-01-27'
+    notes: Fully migrated to has_or_had_identifier + Alpha2Code class (Rule 53). Country.yaml updated. Slot archived.
   revision:
   - label: has_or_had_identifier
     type: slot
   - label: Alpha2Code
     type: class
 - original_slot_id: https://nde.nl/ontology/hc/slot/has_alpha_3_code
+  processed:
+    status: true
+    date: '2026-01-27'
+    notes: Fully migrated to has_or_had_identifier + Alpha3Code class (Rule 53). Country.yaml updated. Slot archived.
   revision:
   - label: has_or_had_identifier
     type: slot
   - label: Alpha3Code
     type: class
-- original_slot_id: https://nde.nl/ontology/hc/slot/has_alpha_3_code
+- original_slot_id: https://nde.nl/ontology/hc/slot/has_alpha_3_code_dup
+  processed:
+    status: true
+    date: '2026-01-27'
+    notes: Duplicate entry processed.
   revision:
   - label: has_or_had_identifier
     type: slot
diff --git a/schemas/20251121/linkml/update_manifest.py b/schemas/20251121/linkml/update_manifest.py
index 6ec008bb38..10c09475df 100644
--- a/schemas/20251121/linkml/update_manifest.py
+++ b/schemas/20251121/linkml/update_manifest.py
@@ -43,34 +43,39 @@ def update_manifest(add_files, remove_files):
 if __name__ == "__main__":
     # Define files to add
     add_files = [
-        {"name": "Confidence", "path": "modules/classes/Confidence.yaml", "category": "class"},
-        {"name": "GovernanceAuthority", "path": "modules/classes/GovernanceAuthority.yaml", "category": "class"},
-        {"name": "GovernanceRole", "path": "modules/classes/GovernanceRole.yaml", "category": "class"},
-        {"name": "GovernanceStructure", "path": "modules/classes/GovernanceStructure.yaml", "category": "class"},
-        {"name": "GoverningBody", "path": "modules/classes/GoverningBody.yaml", "category": "class"},
-        {"name": "HALCAdm1Code", "path": "modules/classes/HALCAdm1Code.yaml", "category": "class"},
-        {"name": "HALCAdm2Name", "path": "modules/classes/HALCAdm2Name.yaml", "category": "class"},
-        {"name": "defines_or_defined", "path": "modules/slots/defines_or_defined.yaml", "category": "slot"},
-        {"name": "grants_or_granted", "path": "modules/slots/grants_or_granted.yaml", "category": "slot"},
-        {"name": "has_or_had_confidence", "path": "modules/slots/has_or_had_confidence.yaml", "category": "slot"},
-        {"name": "is_or_was_governed_by", "path": "modules/slots/is_or_was_governed_by.yaml", "category": "slot"},
-        {"name": "is_or_was_represented_by", "path": "modules/slots/is_or_was_represented_by.yaml", "category": "slot"},
-        {"name": "provides_or_provided_to", "path": "modules/slots/provides_or_provided_to.yaml", "category": "slot"},
+        {"name": "AccessApplication", "path": "modules/classes/AccessApplication.yaml", "category": "class"},
+        {"name": "AccessInterface", "path": "modules/classes/AccessInterface.yaml", "category": "class"},
+        {"name": "AccessionEvent", "path": "modules/classes/AccessionEvent.yaml", "category": "class"},
+        {"name": "Accumulation", "path": "modules/classes/Accumulation.yaml", "category": "class"},
+        {"name": "Coordinates", "path": "modules/classes/Coordinates.yaml", "category": "class"},
+        {"name": "AcquisitionEvent", "path": "modules/classes/AcquisitionEvent.yaml", "category": "class"},
+        {"name": "AcquisitionMethod", "path": "modules/classes/AcquisitionMethod.yaml", "category": "class"},
+        {"name": "grants_or_granted_access_through", "path": "modules/slots/grants_or_granted_access_through.yaml", "category": "slot"},
+        {"name": "has_or_had_interface", "path": "modules/slots/has_or_had_interface.yaml", "category": "slot"},
+        {"name": "is_or_was_accessioned_through", "path": "modules/slots/is_or_was_accessioned_through.yaml", "category": "slot"},
+        {"name": "has_or_had_accumulation", "path": "modules/slots/has_or_had_accumulation.yaml", "category": "slot"},
+        {"name": "has_or_had_coordinates", "path": "modules/slots/has_or_had_coordinates.yaml", "category": "slot"},
+        {"name": "is_or_was_acquired_through", "path": "modules/slots/is_or_was_acquired_through.yaml", "category": "slot"},
+        {"name": "was_acquired_through", "path": "modules/slots/was_acquired_through.yaml", "category": "slot"},
+        {"name": "has_or_had_method", "path": "modules/slots/has_or_had_method.yaml", "category": "slot"},
     ]
 
     # Define files to remove (archived slots)
     remove_files = [
-        "geographic_scope",
-        "governance_authority",
-        "governance_clause",
-        "governance_representative",
-        "governance_role",
-        "governance_structure",
-        "governing_body",
-        "habitat",
-        "halc_adm1_code",
-        "halc_adm2_name",
-        "handwriting_confidence"
+        "has_access_application_url",
+        "has_access_interface_url",
+        "has_accession_date",
+        "has_accession_number",
+        "has_accumulation_end_date",
+        "has_accumulation_start_date",
+        "has_accuracy_in_meters",
+        "has_acquisition_date",
+        "has_acquisition_history",
+        "has_acquisition_method",
+        "has_acquisition_source",
+        "has_activity_description",
+        "has_activity_identifier",
+        "has_activity_name"
     ]
 
     update_manifest(add_files, remove_files)