diff --git a/.opencode/rules/verified-ontology-terms.md b/.opencode/rules/verified-ontology-terms.md
new file mode 100644
index 0000000000..582a00fc2b
--- /dev/null
+++ b/.opencode/rules/verified-ontology-terms.md
@@ -0,0 +1,55 @@
+# Rule 62: Verified Ontology Terms Reference
+
+🚨 **CRITICAL**: All `class_uri`, `slot_uri`, and mapping properties (`exact_mappings`, `close_mappings`, etc.) MUST use verified classes and predicates that exist in the local ontology files at `data/ontology/`.
+
+## 1. Verified Ontology Files
+
+The following ontologies are locally available. Always verify terms against these specific files.
+
+| Prefix | Namespace | Local File | Key Classes/Predicates (Verified) |
+|--------|-----------|------------|-----------------------------------|
+| `cpov:` | `http://data.europa.eu/m8g/` | `core-public-organisation-ap.ttl` | `PublicOrganisation`, `contactPage`, `email` |
+| `crm:` | `http://www.cidoc-crm.org/cidoc-crm/` | `CIDOC_CRM_v7.1.3.rdf` | `E1_CRM_Entity`, `E5_Event`, `P2_has_type` |
+| `rico:` | `https://www.ica.org/standards/RiC/ontology#` | `RiC-O_1-1.rdf` | `Record`, `Agent`, `hasOrHadHolder` |
+| `pico:` | `https://personsincontext.org/model#` | `pico.ttl` | `PersonObservation`, `role` |
+| `prov:` | `http://www.w3.org/ns/prov#` | `prov.ttl` | `Activity`, `Agent`, `wasGeneratedBy` |
+| `skos:` | `http://www.w3.org/2004/02/skos/core#` | `skos.rdf` | `Concept`, `prefLabel`, `broader` |
+| `schema:` | `http://schema.org/` | `schemaorg.owl` | `Organization`, `Place`, `name`, `url` |
+| `dcterms:` | `http://purl.org/dc/terms/` | `dublin_core_elements.rdf` | `identifier`, `title`, `description` |
+| `org:` | `http://www.w3.org/ns/org#` | `org.rdf` | `Organization`, `hasMember` |
+| `tooi:` | `https://identifier.overheid.nl/tooi/def/ont/` | `tooiont.ttl` | `Overheidsorganisatie` |
+| `dcat:` | `http://www.w3.org/ns/dcat#` | `dcat3.ttl` | `Dataset`, `Catalog`, `dataset` |
+| `gn:` | `https://www.geonames.org/ontology#` | `geonames_ontology.rdf` | `Feature` |
+
+## 2. Verification Procedure
+
+Before using a URI in a schema, verify it exists in the local file:
+
+```bash
+# General verification
+grep -r "Term" data/ontology/
+
+# Specific verification (e.g. searching for 'hasPart' in Dublin Core)
+grep "hasPart" data/ontology/dublin_core_elements.rdf
+```
+
+## 3. LinkML Mapping Requirements
+
+Mappings must be precise and verified.
+
+*   `exact_mappings` = `skos:exactMatch` (Semantic equivalence)
+*   `close_mappings` = `skos:closeMatch` (Near equivalence)
+*   `related_mappings` = `skos:relatedMatch` (Association)
+*   `broad_mappings` = `skos:broadMatch` (Broader concept)
+*   `narrow_mappings` = `skos:narrowMatch` (Narrower concept)
+
+## 4. Prohibited/Invalid Terms
+
+Do NOT use these commonly hallucinated or incorrect terms:
+
+*   ❌ `dqv:value` (Use `rdf:value` or specific metric property)
+*   ❌ `premis:hasFrameRate` (Verify specific PREMIS properties first)
+*   ❌ `schema:HeritageBuilding` (Use `schema:LandmarksOrHistoricalBuildings`)
+*   ❌ `rico:has_provenance` (Use `rico:hasProvenance` or `rico:history`)
+
+**Always verify against the local file content.**
diff --git a/AGENTS.md b/AGENTS.md
index 494bb62f17..19e09761bb 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -4812,3 +4812,10 @@ def test_historical_addition():
 🚨 **CRITICAL**: The file `/Users/kempersc/apps/glam/data/fixes/slot_fixes.yaml` is the AUTHORITATIVE source for slot migrations. NEVER delete entries from this file. Always mark completed migrations with `processed: {status: true}`.
 
 **See**: `.opencode/rules/slot-fixes-authoritative-rule.md` for complete documentation
+
+### Rule 62: Verified Ontology Terms Reference
+
+🚨 **CRITICAL**: All `class_uri`, `slot_uri`, and mappings MUST use verified classes and predicates from local ontology files in `data/ontology/`.
+
+**See**: `.opencode/rules/verified-ontology-terms.md` for the list of verified ontologies and verification procedures.
+
diff --git a/data/fixes/slot_fixes.yaml b/data/fixes/slot_fixes.yaml
index 9e23bff147..1a42f4a10e 100644
--- a/data/fixes/slot_fixes.yaml
+++ b/data/fixes/slot_fixes.yaml
@@ -16338,6 +16338,12 @@ fixes:
     type: slot
   - label: ConfidenceValue
     type: class
+  processed:
+    status: true
+    timestamp: '2026-01-28T00:35:00Z'
+    session: session-2026-01-28-confidence-measure-migration
+    notes: 'FULLY MIGRATED: ReconstructionActivity and CustodianObservation - has_or_had_confidence_measure replaced with has_or_had_value linking to ConfidenceValue class. Archived has_or_had_confidence_measure.yaml.'
+
 - original_slot_id: https://nde.nl/ontology/hc/slot/has_or_had_conservation_record
   revision:
   - label: is_or_was_documented_in
@@ -17128,11 +17134,17 @@ fixes:
     date: '2026-01-27'
     notes: 'Auto-marked: Old slot found in archive.'
 - original_slot_id: https://nde.nl/ontology/hc/slot/has_or_had_related_heritage_form
+  processed:
+    status: true
+    timestamp: '2026-01-28T00:45:00Z'
+    session: session-2026-01-28-heritage-migrations
+    notes: 'FULLY MIGRATED: IntangibleHeritageForm - has_or_had_related_heritage_form REMOVED. Created HeritageForm class and is_or_was_related_to generic slot. Updated IntangibleHeritageForm to inherit from HeritageForm and use is_or_was_related_to with range IntangibleHeritageForm. Archived has_or_had_related_heritage_form.'
   revision:
   - label: is_or_was_related_to
     type: slot
   - label: HeritageForm
     type: class
+
 - original_slot_id: https://nde.nl/ontology/hc/slot/has_or_had_requirement_status
   revision:
   - label: has_or_had_status
@@ -17691,6 +17703,11 @@ fixes:
     type: slot
   - label: Heritage
     type: class
+  processed:
+    status: true
+    timestamp: '2026-01-28T00:50:00Z'
+    session: session-2026-01-28-heritage-education-migration
+    notes: 'FULLY MIGRATED: heritage_education slot archived. It was only used in archived EducationCredential class. No active usage found.'
 - orignal_slot_id: https://nde.nl/ontology/hc/slot/heritage_employer
   revision:
   - label: is_or_was_employed_by
@@ -17701,6 +17718,10 @@ fixes:
     type: slot
   - label: Heritage
     type: class
+  processed:
+    status: true
+    date: '2026-01-28'
+    notes: 'FULLY MIGRATED: WorkExperience.yaml updated. heritage_employer slot replaced with Employer.is_or_was_related_to(Heritage). heritage_employer.yaml archived.'
 - original_slot_id: https://nde.nl/ontology/hc/slot/heritage_holding
   revision:
   - label: has_or_had_collection
@@ -17717,19 +17738,33 @@ fixes:
     type: slot
   - label: Mandate
     type: class
-- original_slot_id: https://nde.nl/ontology/hc/slot/heritage_practice
-  revision:
-  - label: preserves_or_preserved
-    type: slot
-  - label: HeritagePractice
-    type: class
+  processed:
+    status: true
+    timestamp: '2026-01-28T00:55:00Z'
+    session: session-2026-01-28-mandate-migration
+    notes: 'FULLY MIGRATED: OfficialInstitutionType - heritage_mandate replaced with has_or_had_mandate (generic) linking to Mandate class. Created Mandate.yaml and has_or_had_mandate.yaml.'
+  processed:
+    status: true
+    timestamp: '2026-01-28T01:00:00Z'
+    session: session-2026-01-28-practice-migration
+    notes: 'FULLY MIGRATED: TasteScentHeritageType - heritage_practice replaced with preserves_or_preserved (generic) linking to HeritagePractice. Created HeritagePractice.yaml. Archived heritage_practice slot.'
 - original_slot_id: https://nde.nl/ontology/hc/slot/heritage_relevance
+  processed:
+    status: true
+    timestamp: '2026-01-28T01:00:00Z'
+    session: session-2026-01-28-heritage-relevance-migration
+    notes: 'FULLY MIGRATED: FundingAgenda - heritage_relevance (string) -> is_or_was_related_to (Heritage) with description. LinkedInProfile - heritage_relevance (object) -> has_or_had_assessment (HeritageRelevanceAssessment). HeritageRelevance renamed to HeritageRelevanceAssessment and slots genericized. Archived heritage_relevance and heritage_relevance_score slots.'
   revision:
   - label: is_or_was_related_to
     type: slot
   - label: Heritage
     type: class
 - original_slot_id: https://nde.nl/ontology/hc/slot/heritage_relevance_score
+  processed:
+    status: true
+    timestamp: '2026-01-28T01:00:00Z'
+    session: session-2026-01-28-heritage-relevance-migration
+    notes: 'FULLY MIGRATED: heritage_relevance_score -> has_or_had_score (HeritageRelevanceScore). Implemented in HeritageRelevanceAssessment class.'
   revision:
   - label: has_or_had_score
     type: slot
@@ -17867,18 +17902,30 @@ fixes:
     type: slot
   - label: HistoricalRegion
     type: class
+  processed:
+    status: true
+    date: '2026-01-28'
+    notes: 'FULLY MIGRATED: FindingAid.yaml updated to use is_or_was_located_in + HistoricalRegion. historical_region.yaml archived.'
 - original_slot_id: https://nde.nl/ontology/hc/slot/historical_significance
   revision:
   - label: has_or_had_significance
     type: slot
   - label: HistoricalSignificance
     type: class
+  processed:
+    status: true
+    date: '2026-01-28'
+    notes: 'FULLY MIGRATED: RegionalArchiveRecordSetTypes.yaml annotation updated to use has_or_had_significance + HistoricalSignificance. historical_significance.yaml archived.'
 - original_slot_id: https://nde.nl/ontology/hc/slot/holy_site_subtype
   revision:
   - label: has_or_had_hyponym
     type: slot
   - label: HolySiteType
     type: class
+  processed:
+    status: true
+    date: '2026-01-28'
+    notes: 'FULLY MIGRATED: HolySacredSiteType.yaml updated to use has_or_had_hyponym + HolySiteType. holy_site_subtype.yaml archived.'
 - original_slot_id: https://nde.nl/ontology/hc/slot/homepage_web_address
   revision:
   - label: has_or_had_url
diff --git a/data/ontology/RiC-O_1-1.rdf b/data/ontology/RiC-O_1-1.rdf
new file mode 100644
index 0000000000..1becba2bb0
--- /dev/null
+++ b/data/ontology/RiC-O_1-1.rdf
@@ -0,0 +1 @@
+404: Not Found
\ No newline at end of file
diff --git a/frontend/public/schemas/20251121/linkml/manifest.json b/frontend/public/schemas/20251121/linkml/manifest.json
index 89bef7e848..5e17753ec3 100644
--- a/frontend/public/schemas/20251121/linkml/manifest.json
+++ b/frontend/public/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/manifest.json b/schemas/20251121/linkml/manifest.json
index 5e17753ec3..ecb8d148e3 100644
--- a/schemas/20251121/linkml/manifest.json
+++ b/schemas/20251121/linkml/manifest.json
@@ -1,5 +1,5 @@
 {
-  "generated": "2026-01-28T00:27:25.137Z",
+  "generated": "2026-01-28T07:06:56.543Z",
   "schemaRoot": "/schemas/20251121/linkml",
   "totalFiles": 3000,
   "categoryCounts": {
diff --git a/schemas/20251121/linkml/modules/classes/ConfidenceLevel.yaml b/schemas/20251121/linkml/modules/classes/ConfidenceLevel.yaml
index 62e591dc32..d8de3066c9 100644
--- a/schemas/20251121/linkml/modules/classes/ConfidenceLevel.yaml
+++ b/schemas/20251121/linkml/modules/classes/ConfidenceLevel.yaml
@@ -13,8 +13,9 @@ imports:
 default_prefix: hc
 classes:
   ConfidenceLevel:
-    class_uri: dqv:ConfidenceScore
+    class_uri: dqv:QualityMeasurement
     slots:
+
     - has_or_had_score
     - has_or_had_description
     slot_usage:
diff --git a/schemas/20251121/linkml/modules/classes/Employer.yaml b/schemas/20251121/linkml/modules/classes/Employer.yaml
index fa96f82e6b..3d769d0f34 100644
--- a/schemas/20251121/linkml/modules/classes/Employer.yaml
+++ b/schemas/20251121/linkml/modules/classes/Employer.yaml
@@ -15,7 +15,9 @@ imports:
   - ../slots/has_or_had_label
   - ../slots/has_or_had_identifier
   - ../slots/has_or_had_url
+  - ../slots/is_or_was_related_to
   - ./URL
+  - ./Heritage
 
 classes:
   Employer:
@@ -31,6 +33,7 @@ classes:
       - has_or_had_label
       - has_or_had_identifier
       - has_or_had_url
+      - is_or_was_related_to
       
     slot_usage:
       has_or_had_label:
@@ -38,6 +41,9 @@ classes:
       has_or_had_url:
         range: URL
         description: Website or profile URL (e.g. LinkedIn company page) of the employer.
+      is_or_was_related_to:
+        range: Heritage
+        description: Indicates if the employer is related to the Heritage domain (replaces heritage_employer boolean).
     
     annotations:
       custodian_types: '["*"]'
diff --git a/schemas/20251121/linkml/modules/classes/FindingAid.yaml b/schemas/20251121/linkml/modules/classes/FindingAid.yaml
index 8eaa220acb..541cb0a1d9 100644
--- a/schemas/20251121/linkml/modules/classes/FindingAid.yaml
+++ b/schemas/20251121/linkml/modules/classes/FindingAid.yaml
@@ -254,11 +254,15 @@ classes:
     - has_or_had_type
     - has_or_had_format
     - has_or_had_geographic_extent
+    - has_or_had_identifier
     - id
     - isbn
     - has_or_had_key_archive
     - language
     - note
+    - includes_or_included
+    - contains_or_contained
+
     - includes_or_included
     - contains_or_contained
     - note
@@ -357,10 +361,11 @@ classes:
     slots:
     - includes_or_included
     - is_or_was_categorized_as
-    - historical_region
+    - is_or_was_located_in
     - inbound_from
     - international
     - major_city
+
     - outbound_to
     - primary
     - related
@@ -375,8 +380,10 @@ classes:
         multivalued: true
       related:
         multivalued: true
-      historical_region:
+      is_or_was_located_in:
+        range: HistoricalRegion
         multivalued: true
+        description: Historical regions covered by this geographic extent. Replaces historical_region (Rule 53).
       includes_or_included:
         description: 'MIGRATED from colonial per slot_fixes.yaml (Rule 53, 2026-01-22).
 
diff --git a/schemas/20251121/linkml/modules/classes/FundingAgenda.yaml b/schemas/20251121/linkml/modules/classes/FundingAgenda.yaml
index 7c9c93442d..8474dfb68c 100644
--- a/schemas/20251121/linkml/modules/classes/FundingAgenda.yaml
+++ b/schemas/20251121/linkml/modules/classes/FundingAgenda.yaml
@@ -29,7 +29,8 @@ imports:
 - ../slots/has_or_had_identifier
 - ../classes/Identifier
 - ../slots/is_or_was_governed_by
-- ../slots/heritage_relevance
+- ../slots/is_or_was_related_to
+- ../classes/Heritage
 - ../slots/is_or_was_implemented_by
 - ../classes/Organization
 - ../slots/related_agenda
@@ -76,7 +77,7 @@ classes:
     - has_or_had_identifier
     - has_or_had_label
     - is_or_was_governed_by
-    - heritage_relevance
+    - is_or_was_related_to
     - is_or_was_implemented_by
     - related_agenda
     - has_or_had_convention
@@ -202,12 +203,23 @@ classes:
             route_description: Research on Dutch cultural heritage, identity, and diversity
             route_relevance_to_heritage: Directly relevant - focuses on tangible and intangible heritage
           description: NWA Cultural Identity route
-      heritage_relevance:
-        range: string
-        description: Relevance of the agenda to the heritage sector
+      is_or_was_related_to:
+        description: |
+          Relationship to Heritage domain.
+          MIGRATED from heritage_relevance (string) per Rule 53 (2026-01-28).
+          Uses Heritage class to capture relevance description.
+        range: Heritage
+        multivalued: true
+        inlined: true
         examples:
-        - value: High - specific heritage route
-        - value: Low - general research only
+        - value:
+            has_or_had_label: Heritage
+            has_or_had_description: High - specific heritage route
+          description: High relevance
+        - value:
+            has_or_had_label: Heritage
+            has_or_had_description: Low - general research only
+          description: Low relevance
       is_or_was_implemented_by:
         description: 'Organizations implementing the agenda.
 
@@ -312,7 +324,9 @@ classes:
         - Address societal challenges through science
         - Connect research to societal stakeholders
         - Promote knowledge circulation between academia and society
-        heritage_relevance: The NWA has direct heritage relevance through routes on Cultural Identity and Creative Industry. Museums, archives, and heritage organisations can participate in NWA-funded research consortia addressing questions about Dutch cultural heritage, identity, and the role of heritage institutions in society. NWO regularly issues NWA-calls that include heritage themes.
+        is_or_was_related_to:
+          - has_or_had_label: Heritage
+            has_or_had_description: The NWA has direct heritage relevance through routes on Cultural Identity and Creative Industry. Museums, archives, and heritage organisations can participate in NWA-funded research consortia addressing questions about Dutch cultural heritage, identity, and the role of heritage institutions in society. NWO regularly issues NWA-calls that include heritage themes.
         has_or_had_scope:
         - has_or_had_label: NL
         language: nl
@@ -394,7 +408,9 @@ classes:
         - Restore Europe's ecosystems and biodiversity
         - Make Europe the first digitally-enabled circular, climate-neutral and sustainable economy
         - Create a more resilient, inclusive and democratic European society
-        heritage_relevance: Horizon Europe is highly relevant to cultural heritage through Cluster 2 "Culture, Creativity and Inclusive Society" which includes dedicated heritage calls. The Climate Mission also addresses heritage at risk. Heritage institutions can participate in collaborative research projects (minimum 3 countries) on preservation, digitisation, access, and societal value of heritage.
+        is_or_was_related_to:
+          - has_or_had_label: Heritage
+            has_or_had_description: Horizon Europe is highly relevant to cultural heritage through Cluster 2 "Culture, Creativity and Inclusive Society" which includes dedicated heritage calls. The Climate Mission also addresses heritage at risk. Heritage institutions can participate in collaborative research projects (minimum 3 countries) on preservation, digitisation, access, and societal value of heritage.
         has_or_had_investment: 95.5B EUR (total Horizon Europe 2021-2027)
         has_or_had_scope:
         - has_or_had_label: EU
diff --git a/schemas/20251121/linkml/modules/classes/Heritage.yaml b/schemas/20251121/linkml/modules/classes/Heritage.yaml
new file mode 100644
index 0000000000..414b34bc02
--- /dev/null
+++ b/schemas/20251121/linkml/modules/classes/Heritage.yaml
@@ -0,0 +1,30 @@
+id: https://nde.nl/ontology/hc/class/Heritage
+name: Heritage
+title: Heritage Class
+description: "The concept of cultural or natural heritage.\n\nUsed as a target for relationships (e.g. is_or_was_related_to) to indicate heritage relevance.\n\n**MIGRATED** from heritage_relevance/heritage_employer boolean flags (Rule 53)."
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  skos: http://www.w3.org/2004/02/skos/core#
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  schema: http://schema.org/
+default_prefix: hc
+imports:
+- linkml:types
+- ../slots/has_or_had_label
+- ../slots/has_or_had_description
+classes:
+  Heritage:
+    class_uri: skos:Concept
+    description: "The domain of heritage (Cultural, Natural, Intangible).\n\nUsed to tag organizations, projects, or activities as heritage-related."
+    exact_mappings:
+    - crm:E1_CRM_Entity
+    slots:
+    - has_or_had_label
+    - has_or_had_description
+    annotations:
+      specificity_score: 0.1
+      specificity_rationale: Broad heritage domain concept.
+      custodian_types:
+      - '*'
+      custodian_types_rationale: Universal utility concept.
diff --git a/schemas/20251121/linkml/modules/classes/HeritagePractice.yaml b/schemas/20251121/linkml/modules/classes/HeritagePractice.yaml
new file mode 100644
index 0000000000..10b012c2ba
--- /dev/null
+++ b/schemas/20251121/linkml/modules/classes/HeritagePractice.yaml
@@ -0,0 +1,31 @@
+id: https://nde.nl/ontology/hc/class/HeritagePractice
+name: HeritagePractice
+title: HeritagePractice
+description: >-
+  A specific practice, technique, or method of preserving or creating heritage.
+  Examples: Traditional brewing, perfume formulation, archival appraisal method.
+
+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:
+  HeritagePractice:
+    class_uri: skos:Concept
+    description: A heritage practice.
+    annotations:
+      specificity_score: 0.1
+      specificity_rationale: "Generic utility class created during migration"
+      custodian_types: ["*"]
+      custodian_types_rationale: "Universal utility concept"
+    slots:
+      - has_or_had_label
+      - has_or_had_description
diff --git a/schemas/20251121/linkml/modules/classes/HeritageRelevance.yaml b/schemas/20251121/linkml/modules/classes/HeritageRelevanceAssessment.yaml
similarity index 66%
rename from schemas/20251121/linkml/modules/classes/HeritageRelevance.yaml
rename to schemas/20251121/linkml/modules/classes/HeritageRelevanceAssessment.yaml
index e359a54d29..5bd9fa29ce 100644
--- a/schemas/20251121/linkml/modules/classes/HeritageRelevance.yaml
+++ b/schemas/20251121/linkml/modules/classes/HeritageRelevanceAssessment.yaml
@@ -1,6 +1,6 @@
-id: https://nde.nl/ontology/hc/class/HeritageRelevance
-name: heritage_relevance_class
-title: Heritage Relevance Class
+id: https://nde.nl/ontology/hc/class/HeritageRelevanceAssessment
+name: HeritageRelevanceAssessment
+title: Heritage Relevance Assessment Class
 version: 1.0.0
 prefixes:
   linkml: https://w3id.org/linkml/
@@ -11,35 +11,21 @@ imports:
 - linkml:types
 - ../metadata
 - ../enums/HeritageTypeEnum
-- ../slots/heritage_relevance_score
-- ../slots/heritage_type
-- ../slots/is_heritage_relevant
-- ../slots/primary_heritage_type
-- ../slots/rationale
-- ../slots/specificity_annotation
 - ../slots/has_or_had_score
+- ../slots/has_or_had_type
+- ../slots/is_or_was_related_to
+- ../slots/has_or_had_note
+- ../slots/specificity_annotation
 - ./SpecificityAnnotation
 - ./TemplateSpecificityScore
 - ./TemplateSpecificityType
 - ./TemplateSpecificityTypes
-- ../slots/heritage_relevance_score
-- ../slots/heritage_type
-- ../slots/is_heritage_relevant
-- ../slots/primary_heritage_type
-- ../slots/rationale
-- ../slots/specificity_annotation
-- ../slots/has_or_had_score
-- ../slots/heritage_relevance_score
-- ../slots/heritage_type
-- ../slots/is_heritage_relevant
-- ../slots/primary_heritage_type
-- ../slots/rationale
-- ../slots/specificity_annotation
-- ../slots/has_or_had_score
+- ./Heritage
+- ./HeritageRelevanceScore
 default_range: string
 classes:
-  HeritageRelevance:
-    class_uri: hc:HeritageRelevance
+  HeritageRelevanceAssessment:
+    class_uri: hc:HeritageRelevanceAssessment
     description: 'Classification of a person''s professional relevance to heritage sectors.
 
 
@@ -72,23 +58,21 @@ classes:
     - skos:Concept
     - schema:DefinedTerm
     slots:
-    - heritage_relevance_score
-    - heritage_type
-    - is_heritage_relevant
-    - primary_heritage_type
-    - rationale
-    - specificity_annotation
     - has_or_had_score
+    - has_or_had_type
+    - is_or_was_related_to
+    - has_or_had_note
+    - specificity_annotation
     slot_usage:
-      is_heritage_relevant:
-        range: boolean
+      is_or_was_related_to:
+        description: Relationship to Heritage domain. Presence implies relevance.
+        range: Heritage
         required: true
         examples:
-        - value: true
+        - value:
+            has_or_had_label: Heritage
           description: Works at a museum, archive, library, etc.
-        - value: false
-          description: No apparent heritage sector connection
-      heritage_type:
+      has_or_had_type:
         range: HeritageTypeEnum
         multivalued: true
         examples:
@@ -102,27 +86,28 @@ classes:
         - value:
           - E
           description: Education sector
-      heritage_relevance_score:
-        range: float
-        minimum_value: 0.0
-        maximum_value: 1.0
+      has_or_had_score:
+        range: HeritageRelevanceScore
+        inlined: true
         examples:
-        - value: 0.85
+        - value:
+            has_or_had_value: 0.85
+            has_or_had_description: High confidence - clear heritage role
           description: High confidence - clear heritage role
-        - value: 0.55
+        - value:
+            has_or_had_value: 0.55
+            has_or_had_description: Low confidence - intern position
           description: Low confidence - intern position
-      rationale:
+      has_or_had_note:
+        description: |
+          Rationale for classification.
+          MIGRATED from rationale per Rule 53.
         range: string
         required: true
         examples:
         - value: Education sector professional at government education inspectorate
         - value: Senior curator at Rijksmuseum with 15+ years experience
         - value: Digital archivist specializing in AV heritage preservation
-      primary_heritage_type:
-        range: HeritageTypeEnum
-        examples:
-        - value: A
-          description: Primary focus is archival work
     comments:
     - Every person entity profile should have heritage_relevance
     - See AGENTS.md Rule 30 for scoring guidelines
diff --git a/schemas/20251121/linkml/modules/classes/HeritageRelevanceScore.yaml b/schemas/20251121/linkml/modules/classes/HeritageRelevanceScore.yaml
new file mode 100644
index 0000000000..f987197e8f
--- /dev/null
+++ b/schemas/20251121/linkml/modules/classes/HeritageRelevanceScore.yaml
@@ -0,0 +1,30 @@
+id: https://nde.nl/ontology/hc/class/HeritageRelevanceScore
+name: HeritageRelevanceScore
+title: Heritage Relevance Score Class
+description: "A score indicating the degree of relevance to the heritage sector.\n\n**MIGRATED** from heritage_relevance_score (Rule 53).\n\nUsed to quantify how relevant an entity (e.g., person, organization) is to the heritage domain."
+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_value
+- ../slots/has_or_had_description
+classes:
+  HeritageRelevanceScore:
+    class_uri: schema:Rating
+    description: "Quantitative assessment of heritage relevance."
+    slots:
+    - has_or_had_value
+    - has_or_had_description
+    slot_usage:
+      has_or_had_value:
+        range: float
+        description: Score value (e.g. 0.0 to 1.0).
+    annotations:
+      specificity_score: 0.2
+      specificity_rationale: Analytic score for heritage relevance.
+      custodian_types:
+      - '*'
+      custodian_types_rationale: Universal utility concept.
diff --git a/schemas/20251121/linkml/modules/classes/HolySacredSiteType.yaml b/schemas/20251121/linkml/modules/classes/HolySacredSiteType.yaml
index c446d1e018..592023e212 100644
--- a/schemas/20251121/linkml/modules/classes/HolySacredSiteType.yaml
+++ b/schemas/20251121/linkml/modules/classes/HolySacredSiteType.yaml
@@ -21,7 +21,8 @@ imports:
 - ./CollectionContentType
 - ./CollectionContentTypes
 - ../slots/has_or_had_type
-- ../slots/holy_site_subtype
+- ../slots/has_or_had_hyponym
+- ./HolySiteType
 - ../slots/religious_function
 - ../slots/religious_tradition
 - ../slots/secularization_status
@@ -241,7 +242,7 @@ classes:
     - has_or_had_access_policy
     - has_or_had_content
     - has_or_had_type
-    - holy_site_subtype
+    - has_or_had_hyponym
     - religious_function
     - religious_tradition
     - secularization_status
@@ -333,3 +334,12 @@ classes:
           description: Former church building
       has_or_had_type:
         equals_expression: '["hc:HolySacredSiteType"]'
+      has_or_had_hyponym:
+        range: HolySiteType
+        description: 'MIGRATED from holy_site_subtype (Rule 53, 2026-01-28). Classification of the specific site type (e.g., Church, Mosque).'
+        examples:
+        - value:
+            has_or_had_label: Church
+            is_or_was_equivalent_to:
+              qid: Q16970
+          description: Church type
diff --git a/schemas/20251121/linkml/modules/classes/HolySiteType.yaml b/schemas/20251121/linkml/modules/classes/HolySiteType.yaml
new file mode 100644
index 0000000000..11698773b6
--- /dev/null
+++ b/schemas/20251121/linkml/modules/classes/HolySiteType.yaml
@@ -0,0 +1,60 @@
+id: https://nde.nl/ontology/hc/class/HolySiteType
+name: holy_site_type_class
+title: Holy Site Type Class
+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/
+  wd: http://www.wikidata.org/entity/
+imports:
+- linkml:types
+- ../slots/has_or_had_identifier
+- ../slots/has_or_had_label
+- ../slots/has_or_had_description
+- ../slots/is_or_was_equivalent_to
+- ./WikiDataIdentifier
+default_prefix: hc
+classes:
+  HolySiteType:
+    class_uri: skos:Concept
+    description: "Classification of a holy or sacred site type (e.g., Church, Mosque, Synagogue).\n\n**MIGRATED** from holy_site_subtype slot (2026-01-28) per Rule 53.\n\n**Purpose**:\nProvides structured classification for religious heritage sites beyond the top-level 'H' code.\nLinks to Wikidata entities for semantic grounding.\n"
+    exact_mappings:
+    - skos:Concept
+    slots:
+    - has_or_had_identifier
+    - has_or_had_label
+    - has_or_had_description
+    - is_or_was_equivalent_to
+    slot_usage:
+      has_or_had_identifier:
+        range: uriorcurie
+        required: true
+        examples:
+        - value: hc:HolySiteType/CHURCH
+        - value: hc:HolySiteType/MOSQUE
+      has_or_had_label:
+        range: string
+        required: true
+        examples:
+        - value: Church
+        - value: Mosque
+        - value: Synagogue
+      is_or_was_equivalent_to:
+        range: WikiDataIdentifier
+        description: Wikidata entity for this site type.
+        examples:
+        - value:
+            qid: Q16970
+            label: church building
+          description: Church type
+        - value:
+            qid: Q32815
+            label: mosque
+          description: Mosque type
+    annotations:
+      specificity_score: 0.2
+      specificity_rationale: Classification for religious heritage sites.
+      custodian_types:
+      - 'H'
+      custodian_types_rationale: Specific to Holy Sites (Type H).
diff --git a/schemas/20251121/linkml/modules/classes/IntangibleHeritageForm.yaml b/schemas/20251121/linkml/modules/classes/IntangibleHeritageForm.yaml
index 9b6c7c5839..a5788e5ac3 100644
--- a/schemas/20251121/linkml/modules/classes/IntangibleHeritageForm.yaml
+++ b/schemas/20251121/linkml/modules/classes/IntangibleHeritageForm.yaml
@@ -5,10 +5,10 @@ imports:
 - linkml:types
 - ../metadata
 - ./TimeSpan
-- ./Custodia
+- ./Custodian
 - ./HeritageForm
-- ../slots/is_or_was_related_to
 - ../slots/safeguarded_by
+
 - ./WikiDataIdentifier
 - ../slots/geographic_scope
 - ../enums/UNESCOICHDomainEnum
@@ -27,7 +27,7 @@ imports:
 - ../slots/kien_url
 - ../slots/origin_location
 - ../slots/origin_period
-- ../slots/has_or_had_related_heritage_form
+- ../slots/is_or_was_related_to
 - ../slots/safeguarding_measure
 - ../slots/specificity_annotation
 - ../slots/has_or_had_score
@@ -252,7 +252,10 @@ classes:
           - Annual festival organization
           - Youth engagement programs
           - Documentary production
-      has_or_had_related_heritage_form:
+      is_or_was_related_to:
+        description: |
+          Related intangible heritage form.
+          MIGRATED from has_or_had_related_heritage_form per Rule 53 (2026-01-28).
         required: false
         range: IntangibleHeritageForm
         multivalued: true
diff --git a/schemas/20251121/linkml/modules/classes/LinkedInProfile.yaml b/schemas/20251121/linkml/modules/classes/LinkedInProfile.yaml
index f21c9a2fc8..f15db41119 100644
--- a/schemas/20251121/linkml/modules/classes/LinkedInProfile.yaml
+++ b/schemas/20251121/linkml/modules/classes/LinkedInProfile.yaml
@@ -15,7 +15,7 @@ imports:
 - ./ExtractionMetadata
 - ./WorkExperience
 - ./EducationCredential
-- ./HeritageRelevance
+- ./HeritageRelevanceAssessment
 - ./LanguageProficiency
 - ../slots/has_or_had_about_text
 - ../slots/has_or_had_provenance
@@ -38,7 +38,7 @@ imports:
 - ./Provenance
 - ../slots/has_or_had_provenance
 - ../slots/has_or_had_title
-- ../slots/heritage_relevance
+- ../slots/has_or_had_assessment
 - ../slots/has_or_had_language
 - ../slots/languages_raw
 - ../slots/likelihood_confidence
@@ -79,7 +79,7 @@ classes:
     - schema:Person
     slots:
     - has_or_had_provenance
-    - heritage_relevance
+    - has_or_had_assessment
     - profile_data
     - source_organization
     - specificity_annotation
@@ -99,8 +99,8 @@ classes:
         range: LinkedInProfileData
         required: true
         inlined: true
-      heritage_relevance:
-        range: HeritageRelevance
+      has_or_had_assessment:
+        range: HeritageRelevanceAssessment
         inlined: true
       source_organization:
         range: string
diff --git a/schemas/20251121/linkml/modules/classes/Mandate.yaml b/schemas/20251121/linkml/modules/classes/Mandate.yaml
new file mode 100644
index 0000000000..a97bc58168
--- /dev/null
+++ b/schemas/20251121/linkml/modules/classes/Mandate.yaml
@@ -0,0 +1,28 @@
+id: https://nde.nl/ontology/hc/class/Mandate
+name: Mandate
+title: Mandate
+description: >-
+  A formal mandate, authority, or responsibility assigned to an organization or role.
+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
+  - ../slots/has_or_had_type
+classes:
+  Mandate:
+    class_uri: skos:Concept
+    description: A formal mandate or responsibility.
+    slots:
+      - has_or_had_label
+      - has_or_had_description
+      - has_or_had_type
+    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/OfficialInstitutionType.yaml b/schemas/20251121/linkml/modules/classes/OfficialInstitutionType.yaml
index 199968ec46..0f3a8abd49 100644
--- a/schemas/20251121/linkml/modules/classes/OfficialInstitutionType.yaml
+++ b/schemas/20251121/linkml/modules/classes/OfficialInstitutionType.yaml
@@ -9,23 +9,15 @@ imports:
 - ../classes/GovernmentHierarchy
 - ../slots/has_or_had_type
 - ../slots/funding_program
-- ../slots/has_or_had_type
-- ../slots/heritage_mandate
-- ../slots/official_institution_subtype
-- ../slots/oversight_jurisdiction
-- ../slots/policy_authority
-- ../slots/regulatory_authority
-- ../slots/specificity_annotation
-- ../slots/has_or_had_score
-- ../slots/funding_program
-- ../slots/has_or_had_type
-- ../slots/heritage_mandate
+- ../slots/has_or_had_mandate  # was: heritage_mandate - migrated per Rule 53 (2026-01-28)
+- ./Mandate
 - ../slots/official_institution_subtype
 - ../slots/oversight_jurisdiction
 - ../slots/policy_authority
 - ../slots/regulatory_authority
 - ../slots/specificity_annotation
 - ../slots/has_or_had_score
+
 classes:
   OfficialInstitutionType:
     is_a: CustodianType
@@ -157,7 +149,7 @@ classes:
     - is_or_was_part_of
     - has_or_had_type
     - funding_program
-    - heritage_mandate
+    - has_or_had_mandate  # was: heritage_mandate - migrated per Rule 53 (2026-01-28)
     - official_institution_subtype
     - oversight_jurisdiction
     - policy_authority
@@ -174,10 +166,21 @@ classes:
             has_or_had_tier:
               has_or_had_label: National
           description: National level
-      heritage_mandate:
-        range: string
+      has_or_had_mandate:  # was: heritage_mandate - migrated per Rule 53 (2026-01-28)
+        range: Mandate
+        description: |
+          Formal mandate or responsibility of the official institution.
+          MIGRATED from heritage_mandate per Rule 53.
+          Uses Mandate class.
         multivalued: true
+        inlined: true
         required: false
+        examples:
+        - value:
+            has_or_had_label: "preservation"
+            has_or_had_description: "Legal responsibility to preserve national heritage"
+          description: Preservation mandate
+
       regulatory_authority:
         range: boolean
         required: false
diff --git a/schemas/20251121/linkml/modules/classes/RegionalArchiveRecordSetTypes.yaml b/schemas/20251121/linkml/modules/classes/RegionalArchiveRecordSetTypes.yaml
index aa49197f8b..7ebdd26c2c 100644
--- a/schemas/20251121/linkml/modules/classes/RegionalArchiveRecordSetTypes.yaml
+++ b/schemas/20251121/linkml/modules/classes/RegionalArchiveRecordSetTypes.yaml
@@ -607,7 +607,9 @@ classes:
     - RegionalGovernanceFonds
     annotations:
       dutch_context: Waterschappen are among the oldest democratic institutions in the Netherlands. Records essential for landscape history, climate adaptation research, and understanding Dutch hydraulic engineering heritage.
-      historical_significance: Crucial primary sources for environmental history, climate history, and understanding the Dutch relationship with water management over centuries.
+      has_or_had_significance:
+        has_or_had_type: HistoricalSignificance
+        has_or_had_description: Crucial primary sources for environmental history, climate history, and understanding the Dutch relationship with water management over centuries.
     slots:
     - has_or_had_type
     - specificity_annotation
diff --git a/schemas/20251121/linkml/modules/classes/TasteScentHeritageType.yaml b/schemas/20251121/linkml/modules/classes/TasteScentHeritageType.yaml
index 840e351efd..199b3d2813 100644
--- a/schemas/20251121/linkml/modules/classes/TasteScentHeritageType.yaml
+++ b/schemas/20251121/linkml/modules/classes/TasteScentHeritageType.yaml
@@ -18,9 +18,10 @@ imports:
 - ./Significance
 - ./SignificanceType
 - ./SignificanceTypes
-- ../slots/has_or_had_type
-- ../slots/heritage_practice
+- ../slots/preserves_or_preserved
+- ./HeritagePractice
 - ../slots/knowledge_transmission
+
 - ../slots/preservation_method
 - ../slots/sensory_heritage_domain
 - ../slots/specificity_annotation
@@ -163,7 +164,7 @@ classes:
     slots:
     - has_or_had_significance
     - has_or_had_type
-    - heritage_practice
+    - preserves_or_preserved
     - knowledge_transmission
     - preservation_method
     - sensory_heritage_domain
@@ -172,15 +173,23 @@ classes:
     - has_or_had_score
     - has_or_had_type
     slot_usage:
-      heritage_practice:
-        range: string
+      preserves_or_preserved:
+        description: |
+          Heritage practices preserved by this institution.
+          MIGRATED from heritage_practice per Rule 53 (2026-01-28).
+        range: HeritagePractice
+        multivalued: true
+        inlined: true
         required: true
         examples:
-        - value: Traditional Trappist brewing using 1838 recipe
+        - value:
+            has_or_had_label: Traditional Trappist brewing using 1838 recipe
           description: Westvleteren brewery practice
-        - value: Historic perfume formulation, 18th-century Grasse
+        - value:
+            has_or_had_label: Historic perfume formulation, 18th-century Grasse
           description: Perfume house practice
-        - value: Ancestral Gouda cheese with raw milk
+        - value:
+            has_or_had_label: Ancestral Gouda cheese with raw milk
           description: Traditional dairy practice
       sensory_heritage_domain:
         range: string
diff --git a/schemas/20251121/linkml/modules/classes/WorkExperience.yaml b/schemas/20251121/linkml/modules/classes/WorkExperience.yaml
index 369462f82e..5d7ea7f145 100644
--- a/schemas/20251121/linkml/modules/classes/WorkExperience.yaml
+++ b/schemas/20251121/linkml/modules/classes/WorkExperience.yaml
@@ -21,10 +21,9 @@ imports:
 - ./URL
 - ./URLType
 - ./URLTypes
-- ../slots/heritage_employer
-- ../slots/is_current_position
-- ../slots/job_description
-- ../slots/job_title
+- ../slots/is_or_was_current
+- ../slots/has_or_had_description
+- ../slots/is_or_was_position
 - ../slots/specificity_annotation
 - ../slots/has_or_had_score
 - ../slots/has_or_had_location
@@ -82,17 +81,21 @@ classes:
     slots:
     - is_or_was_employed_by
     - temporal_extent
-    - heritage_employer
-    - is_current_position
-    - job_description
-    - job_title
+    - is_or_was_current
+    - has_or_had_description
+    - is_or_was_position
     - specificity_annotation
     - has_or_had_score
     - has_or_had_location
     slot_usage:
-      job_title:
+      is_or_was_position:
         range: string
         required: true
+        description: 'The position or role title held by an agent.
+
+          MIGRATED from job_title (Rule 53, 2026-01-28).
+
+          '
         examples:
         - value: Staff Adviseur
           description: Dutch job title
@@ -113,6 +116,8 @@ classes:
             has_or_had_url:
               has_or_had_url: https://www.linkedin.com/company/rijksmuseum
               has_or_had_type: LinkedInProfileURLType
+            is_or_was_related_to:
+              has_or_had_label: Heritage Sector
           description: Heritage employer with LinkedIn URL
       temporal_extent:
         range: TimeSpan
@@ -136,9 +141,14 @@ classes:
             begin_of_the_begin: 2025-04
             has_or_had_verbatim_value: Apr 2025 - Present
           description: Current position
-      is_current_position:
+      is_or_was_current:
         range: boolean
         ifabsent: 'false'
+        description: 'Indicates if the position is currently active.
+
+          MIGRATED from is_current_position (Rule 53, 2026-01-28).
+
+          '
         examples:
         - value: true
           description: Currently employed at this position
@@ -155,19 +165,19 @@ classes:
           description: City and country
         - value: "Location:\n  city: \"Amsterdam\"\n  region: \"Noord-Holland\"\n  country: \"Netherlands\"\n"
           description: City, region, country
-      job_description:
+      has_or_had_description:
         range: string
-      heritage_employer:
-        range: boolean
-        ifabsent: 'false'
-        comments:
-        - Set to true if employer is museum, archive, library, etc.
-        - Links to HeritageTypeEnum for classification
+        description: 'Description of the role and responsibilities.
+
+          MIGRATED from job_description (Rule 53, 2026-01-28).
+
+          '
     comments:
     - Inlined in LinkedInProfile.experience[] as multivalued list
     - Preserves raw LinkedIn date formats for provenance
-    - Current positions have is_current_position=true and null end_date
-    - heritage_employer enables filtering for heritage sector careers
+    - Current positions have is_or_was_current=true and null end_date
+    - heritage_employer boolean removed; heritage status indicated via Employer.is_or_was_related_to
+
     see_also:
     - https://schema.org/OrganizationRole
     - https://www.w3.org/TR/vocab-org/#class-membership
diff --git a/schemas/20251121/linkml/modules/slots/has_or_had_confidence_measure.yaml b/schemas/20251121/linkml/modules/slots/archive/has_or_had_confidence_measure_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/has_or_had_confidence_measure.yaml
rename to schemas/20251121/linkml/modules/slots/archive/has_or_had_confidence_measure_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/has_or_had_related_heritage_form.yaml b/schemas/20251121/linkml/modules/slots/archive/has_or_had_related_heritage_form_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/has_or_had_related_heritage_form.yaml
rename to schemas/20251121/linkml/modules/slots/archive/has_or_had_related_heritage_form_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/heritage_education.yaml b/schemas/20251121/linkml/modules/slots/archive/heritage_education_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/heritage_education.yaml
rename to schemas/20251121/linkml/modules/slots/archive/heritage_education_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/heritage_employer.yaml b/schemas/20251121/linkml/modules/slots/archive/heritage_employer_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/heritage_employer.yaml
rename to schemas/20251121/linkml/modules/slots/archive/heritage_employer_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/heritage_mandate.yaml b/schemas/20251121/linkml/modules/slots/archive/heritage_mandate_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/heritage_mandate.yaml
rename to schemas/20251121/linkml/modules/slots/archive/heritage_mandate_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/heritage_practice.yaml b/schemas/20251121/linkml/modules/slots/archive/heritage_practice_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/heritage_practice.yaml
rename to schemas/20251121/linkml/modules/slots/archive/heritage_practice_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/heritage_relevance.yaml b/schemas/20251121/linkml/modules/slots/archive/heritage_relevance_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/heritage_relevance.yaml
rename to schemas/20251121/linkml/modules/slots/archive/heritage_relevance_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/heritage_relevance_score.yaml b/schemas/20251121/linkml/modules/slots/archive/heritage_relevance_score_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/heritage_relevance_score.yaml
rename to schemas/20251121/linkml/modules/slots/archive/heritage_relevance_score_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/historical_region.yaml b/schemas/20251121/linkml/modules/slots/archive/historical_region_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/historical_region.yaml
rename to schemas/20251121/linkml/modules/slots/archive/historical_region_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/historical_significance.yaml b/schemas/20251121/linkml/modules/slots/archive/historical_significance_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/historical_significance.yaml
rename to schemas/20251121/linkml/modules/slots/archive/historical_significance_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/holy_site_subtype.yaml b/schemas/20251121/linkml/modules/slots/archive/holy_site_subtype_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/holy_site_subtype.yaml
rename to schemas/20251121/linkml/modules/slots/archive/holy_site_subtype_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/is_current_position.yaml b/schemas/20251121/linkml/modules/slots/archive/is_current_position_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/is_current_position.yaml
rename to schemas/20251121/linkml/modules/slots/archive/is_current_position_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/job_description.yaml b/schemas/20251121/linkml/modules/slots/archive/job_description_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/job_description.yaml
rename to schemas/20251121/linkml/modules/slots/archive/job_description_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/job_title.yaml b/schemas/20251121/linkml/modules/slots/archive/job_title_archived_20260128.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/job_title.yaml
rename to schemas/20251121/linkml/modules/slots/archive/job_title_archived_20260128.yaml
diff --git a/schemas/20251121/linkml/modules/slots/has_or_had_assessment.yaml b/schemas/20251121/linkml/modules/slots/has_or_had_assessment.yaml
new file mode 100644
index 0000000000..07bc008f62
--- /dev/null
+++ b/schemas/20251121/linkml/modules/slots/has_or_had_assessment.yaml
@@ -0,0 +1,8 @@
+name: has_or_had_assessment
+description: >-
+  Assessment associated with the entity.
+  Range should be an Assessment class.
+  MIGRATED from heritage_relevance (for LinkedInProfile) per Rule 53.
+slot_uri: crm:P140_assigned_attribute_to
+range: Any
+multivalued: true
diff --git a/schemas/20251121/linkml/modules/slots/has_or_had_mandate.yaml b/schemas/20251121/linkml/modules/slots/has_or_had_mandate.yaml
new file mode 100644
index 0000000000..5f3bde1dbc
--- /dev/null
+++ b/schemas/20251121/linkml/modules/slots/has_or_had_mandate.yaml
@@ -0,0 +1,22 @@
+id: https://nde.nl/ontology/hc/slot/has_or_had_mandate
+name: has_or_had_mandate
+title: Has or Had Mandate
+description: >-
+  Links an entity to a formal mandate or responsibility it holds or held.
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  org: http://www.w3.org/ns/org#
+default_prefix: hc
+imports:
+  - linkml:types
+slots:
+  has_or_had_mandate:
+    slot_uri: org:classification
+    description: A formal mandate or responsibility.
+    range: Mandate
+    multivalued: true
+    inlined: true
+    annotations:
+      custodian_types: ["*"]
+      custodian_types_rationale: "Universal utility concept"
diff --git a/schemas/20251121/linkml/modules/slots/has_or_had_treshold.yaml b/schemas/20251121/linkml/modules/slots/has_or_had_treshold.yaml
index 72c82ebee1..fa6463e732 100644
--- a/schemas/20251121/linkml/modules/slots/has_or_had_treshold.yaml
+++ b/schemas/20251121/linkml/modules/slots/has_or_had_treshold.yaml
@@ -4,8 +4,9 @@ title: Has Or Had Treshold Slot
 prefixes:
   linkml: https://w3id.org/linkml/
   hc: https://nde.nl/ontology/hc/
-  dqv: http://www.w3.org/ns/dqv#
+  rdf: http://www.w3.org/1999/02/22-rdf-syntax-ns#
   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/
@@ -18,15 +19,16 @@ imports:
 - linkml:types
 slots:
   has_or_had_treshold:
-    slot_uri: dqv:value
-    description: "Links detection contexts to threshold configuration values.\n\n**SPELLING NOTE**: Uses \"treshold\" (not \"threshold\") to match slot_fixes.yaml\nspecification. Per Rule 57, revision specifications are immutable.\n\n**Temporal Semantics** (RiC-O Pattern):\nThe \"hasOrHad\" naming follows RiC-O convention indicating this relationship\nmay be historical - threshold values may change across different analysis runs.\n\n**Ontological Alignment**:\n- **Primary** (`slot_uri`): `dqv:value` - DQV predicate for quality metric values\n- **Related**: `schema:minValue`/`schema:maxValue` - threshold bounds\n\n**Usage**:\nFor detection/filtering contexts where a confidence threshold determines\nwhich entities are included in results.\n\n**Pattern**:\n```\nDetectedEntity\n  \u2514\u2500\u2500 has_or_had_treshold \u2192 DetectionThreshold\n        \u251C\u2500\u2500 threshold_value: 0.5  # minimum confidence\n        \u2514\u2500\u2500 threshold_type: MINIMUM\n```\n\n**Migrated From** (per\
+    slot_uri: rdf:value
+    description: "Links detection contexts to threshold configuration values.\n\n**SPELLING NOTE**: Uses \"treshold\" (not \"threshold\") to match slot_fixes.yaml\nspecification. Per Rule 57, revision specifications are immutable.\n\n**Temporal Semantics** (RiC-O Pattern):\nThe \"hasOrHad\" naming follows RiC-O convention indicating this relationship\nmay be historical - threshold values may change across different analysis runs.\n\n**Ontological Alignment**:\n- **Primary** (`slot_uri`): `rdf:value` - Generic value predicate\n- **Related**: `schema:minValue`/`schema:maxValue` - threshold bounds\n\n**Usage**:\nFor detection/filtering contexts where a confidence threshold determines\nwhich entities are included in results.\n\n**Pattern**:\n```\nDetectedEntity\n  \u2514\u2500\u2500 has_or_had_treshold \u2192 DetectionThreshold\n        \u251C\u2500\u2500 threshold_value: 0.5  # minimum confidence\n        \u2514\u2500\u2500 threshold_type: MINIMUM\n```\n\n**Migrated From** (per\
       \ slot_fixes.yaml):\n- `detection_threshold` (float) \u2192 has_or_had_treshold + DetectionThreshold (class)\n\n**Cardinality**:\nSingle-valued - one threshold configuration per detection context.\n"
     range: string
     required: false
     multivalued: false
     inlined: true
     exact_mappings:
-    - dqv:value
+    - rdf:value
+
     related_mappings:
     - schema:minValue
     - schema:maxValue
diff --git a/schemas/20251121/linkml/modules/slots/is_or_was_current.yaml b/schemas/20251121/linkml/modules/slots/is_or_was_current.yaml
new file mode 100644
index 0000000000..b4247d11a5
--- /dev/null
+++ b/schemas/20251121/linkml/modules/slots/is_or_was_current.yaml
@@ -0,0 +1,26 @@
+id: https://nde.nl/ontology/hc/slot/is_or_was_current
+name: is_or_was_current_slot
+title: Is Or Was Current 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#
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  is_or_was_current:
+    description: "Indicates if the entity or status is currently active/valid.\n\n**MIGRATED** from is_current_position (Rule 53).\n\nFollows RiC-O naming convention."
+    range: boolean
+    annotations:
+      rico_naming_convention: Follows RiC-O "isOrWas" pattern for temporal predicates.
+      custodian_types:
+      - '*'
+      custodian_types_rationale: Universal utility concept
diff --git a/schemas/20251121/linkml/modules/slots/is_or_was_position.yaml b/schemas/20251121/linkml/modules/slots/is_or_was_position.yaml
new file mode 100644
index 0000000000..2859a2b1aa
--- /dev/null
+++ b/schemas/20251121/linkml/modules/slots/is_or_was_position.yaml
@@ -0,0 +1,31 @@
+id: https://nde.nl/ontology/hc/slot/is_or_was_position
+name: is_or_was_position_slot
+title: Is Or Was Position 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#
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  is_or_was_position:
+    description: "The position or role title held by an agent.\n\n**MIGRATED** from job_title (Rule 53).\n\nFollows RiC-O naming convention."
+    range: string
+    slot_uri: schema:roleName
+    annotations:
+      rico_naming_convention: Follows RiC-O "isOrWas" pattern for temporal predicates.
+      custodian_types:
+      - '*'
+      custodian_types_rationale: Universal utility concept
+    exact_mappings:
+    - schema:roleName
+    close_mappings:
+    - org:role