chore: Update manifest and add remaining slot migrations

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

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

Archive deprecated slots per Rule 53 workflow.

.opencode/rules/full-slot-migration-rule.md

@@ -31,10 +31,112 @@ The `slot_fixes.yaml` file has been **manually curated** to specify the exact re
 - ✅ Follow the `revision` section TO THE LETTER
 - ✅ Use EXACTLY the slots and classes specified
 - ✅ Apply ALL components of the revision (both slots AND classes)
+- ✅ Interpret `link_branch` fields correctly (see below)
 - ✅ Update `processed.status: true` after completing migration
 
 ---
 
+## Understanding `link_branch` in Revision Plans
+
+🚨 **CRITICAL**: The `link_branch` field in revision plans indicates **nested class attributes**. Items with `link_branch: N` are slots/classes that belong TO the primary class, not standalone replacements.
+
+### How to Interpret `link_branch`
+
+| Revision Item | Meaning |
+|---------------|---------|
+| Items **WITHOUT** `link_branch` | **PRIMARY** slot and class to create |
+| Items **WITH** `link_branch: 1` | First attribute branch that the primary class needs |
+| Items **WITH** `link_branch: 2` | Second attribute branch that the primary class needs |
+| Items **WITH** `link_branch: N` | Nth attribute branch for the primary class |
+
+### Example: `visitor_count` Revision
+
+```yaml
+- original_slot_id: https://nde.nl/ontology/hc/slot/visitor_count
+  revision:
+    - label: has_or_had_quantity     # PRIMARY SLOT (no link_branch)
+      type: slot
+    - label: Quantity                 # PRIMARY CLASS (no link_branch)
+      type: class
+    - label: has_or_had_measurement_unit   # Quantity needs this slot
+      type: slot
+      link_branch: 1                        # ← Branch 1: unit attribute
+    - label: MeasureUnit                    # Range of has_or_had_measurement_unit
+      type: class
+      value:
+        - visitors
+      link_branch: 1
+    - label: temporal_extent               # Quantity needs this slot too
+      type: slot
+      link_branch: 2                        # ← Branch 2: time attribute
+    - label: TimeSpan                       # Range of temporal_extent
+      type: class
+      link_branch: 2
+```
+
+**Interpretation**: This creates:
+1. **Primary**: `has_or_had_quantity` slot → `Quantity` class
+2. **Branch 1**: `Quantity.has_or_had_measurement_unit` → `MeasureUnit` (with value "visitors")
+3. **Branch 2**: `Quantity.temporal_extent` → `TimeSpan`
+
+### Resulting Class Structure
+
+```yaml
+# The Quantity class should have these slots:
+Quantity:
+  slots:
+    - has_or_had_measurement_unit  # From link_branch: 1
+    - temporal_extent              # From link_branch: 2
+```
+
+### Complex Example: `visitor_conversion_rate`
+
+```yaml
+- original_slot_id: https://nde.nl/ontology/hc/slot/visitor_conversion_rate
+  revision:
+    - label: has_or_had_conversion_rate    # PRIMARY SLOT
+      type: slot
+    - label: ConversionRate                 # PRIMARY CLASS
+      type: class
+    - label: has_or_had_type               # ConversionRate.has_or_had_type
+      type: slot
+      link_branch: 1
+    - label: ConversionRateType            # Abstract type class
+      type: class
+      link_branch: 1
+    - label: includes_or_included          # ConversionRateType hierarchy slot
+      type: slot  
+      link_branch: 1
+    - label: ConversionRateTypes           # Concrete subclasses file
+      type: class
+      link_branch: 1
+    - label: temporal_extent               # ConversionRate.temporal_extent
+      type: slot
+      link_branch: 2
+    - label: TimeSpan                      # Range of temporal_extent
+      type: class
+      link_branch: 2
+```
+
+**Interpretation**:
+1. **Primary**: `has_or_had_conversion_rate` → `ConversionRate`
+2. **Branch 1**: Type hierarchy with `ConversionRateType` (abstract) + `ConversionRateTypes` (concrete subclasses)
+3. **Branch 2**: Temporal tracking via `temporal_extent` → `TimeSpan`
+
+### Migration Checklist for `link_branch` Revisions
+
+- [ ] Create/verify PRIMARY slot exists
+- [ ] Create/verify PRIMARY class exists
+- [ ] For EACH `link_branch: N`:
+  - [ ] Add the branch slot to PRIMARY class's `slots:` list
+  - [ ] Import the branch slot file
+  - [ ] Import the branch class file (if creating new class)
+  - [ ] Verify range of branch slot points to branch class
+- [ ] Update consuming class to use PRIMARY slot (not deprecated slot)
+- [ ] Update examples to show nested structure
+
+---
+
 ## Mandatory: Follow slot_fixes.yaml Revisions Exactly
 
 **The `revision` section in `slot_fixes.yaml` is AUTHORITATIVE.** Do not substitute different slots based on your own judgment.

AGENTS.md

@@ -1603,6 +1603,43 @@ The `revision` section in `slot_fixes.yaml` specifies the EXACT slots and classe
 - ❌ Partially apply revisions
 - ❌ Add deprecation notes (keeping both old and new)
 
+**Understanding `link_branch` in Revisions**:
+
+The `link_branch` field indicates **nested class attributes**:
+
+| Revision Item | Meaning |
+|---------------|---------|
+| Items **WITHOUT** `link_branch` | PRIMARY slot and class to create |
+| Items **WITH** `link_branch: 1` | First attribute the primary class needs |
+| Items **WITH** `link_branch: 2` | Second attribute the primary class needs |
+
+**Example - `visitor_count` with `link_branch`**:
+
+```yaml
+- original_slot_id: https://nde.nl/ontology/hc/slot/visitor_count
+  revision:
+    - label: has_or_had_quantity     # PRIMARY SLOT
+      type: slot
+    - label: Quantity                 # PRIMARY CLASS
+      type: class
+    - label: has_or_had_measurement_unit   # Quantity.has_or_had_measurement_unit
+      type: slot
+      link_branch: 1                        # ← Branch 1
+    - label: MeasureUnit                    # Range of branch 1 slot
+      type: class
+      link_branch: 1
+    - label: temporal_extent               # Quantity.temporal_extent
+      type: slot
+      link_branch: 2                        # ← Branch 2
+    - label: TimeSpan                       # Range of branch 2 slot
+      type: class
+      link_branch: 2
+```
+
+**Interpretation**: Create `Quantity` class with TWO slots:
+- `has_or_had_measurement_unit` → `MeasureUnit` (branch 1)
+- `temporal_extent` → `TimeSpan` (branch 2)
+
 **Example - Following slot_fixes.yaml**:
 
 ```yaml

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

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

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

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

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

@@ -0,0 +1,149 @@
+id: https://nde.nl/ontology/hc/class/ApproximationStatus
+name: approximation_status_class
+title: ApproximationStatus Class
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  rico: https://www.ica.org/standards/RiC/ontology#
+  skos: http://www.w3.org/2004/02/skos/core#
+imports:
+- linkml:types
+- ../metadata
+- ../slots/approximation_level
+- ../slots/has_or_had_label
+- ../slots/has_or_had_description
+- ./SpecificityAnnotation
+- ./TemplateSpecificityScores
+- ../slots/specificity_annotation
+- ../slots/template_specificity
+default_prefix: hc
+classes:
+  ApproximationStatus:
+    class_uri: hc:ApproximationStatus
+    description: >-
+      Status indicating the level of approximation or uncertainty for a value.
+      
+      **PURPOSE**:
+      
+      ApproximationStatus captures structured uncertainty information for values
+      like dates, quantities, and measurements where precision varies. This
+      replaces simple boolean "approximate: true/false" with richer modeling.
+      
+      **UNCERTAINTY LEVELS**:
+      
+      | Level | Label | Description | Example |
+      |-------|-------|-------------|---------|
+      | EXACT | Exact | Known with certainty | "1880-03-15" |
+      | APPROXIMATE | Approximate | Close but not exact | "circa 1880" |
+      | ESTIMATED | Estimated | Calculated/inferred | "estimated 1875-1885" |
+      | UNCERTAIN | Uncertain | Significant doubt | "possibly 19th century" |
+      | UNKNOWN | Unknown | Cannot be determined | "date unknown" |
+      
+      **CIDOC-CRM ALIGNMENT**:
+      
+      CIDOC-CRM models time-span precision through E52_Time-Span with fuzzy
+      boundaries. ApproximationStatus provides a complementary vocabulary for
+      expressing certainty levels.
+      
+      **USE CASES**:
+      
+      1. **Date Uncertainty**: Founding dates known only to decade
+      2. **Quantity Estimates**: Collection size approximations
+      3. **Location Precision**: Address known only to city level
+      4. **Historical Events**: Uncertain timing of organizational changes
+      
+      **EXAMPLE**:
+      
+      ```yaml
+      event_date: "1880"
+      is_or_was_approximate:
+        approximation_level: APPROXIMATE
+        has_or_had_label: "circa 1880"
+        has_or_had_description: "Founding date known only to year from secondary sources"
+      ```
+    exact_mappings:
+      - crm:E52_Time-Span
+    close_mappings:
+      - rico:DateType
+    related_mappings:
+      - skos:note
+    slots:
+      - approximation_level
+      - has_or_had_label
+      - has_or_had_description
+      - specificity_annotation
+      - template_specificity
+    slot_usage:
+      approximation_level:
+        range: ApproximationLevelEnum
+        required: true
+        description: >-
+          Level of approximation/uncertainty for the value.
+      has_or_had_label:
+        range: string
+        required: false
+        description: >-
+          Human-readable label for the approximation status.
+        examples:
+          - value: "circa 1880"
+            description: Approximate date label
+          - value: "approximately 10,000"
+            description: Approximate quantity label
+      has_or_had_description:
+        range: string
+        required: false
+        description: >-
+          Explanation of why the value is approximate and how uncertainty
+          was determined.
+        examples:
+          - value: "Founding date derived from secondary sources, exact day unknown"
+            description: Provenance of uncertainty
+    comments:
+      - ApproximationStatus replaces simple boolean approximate field
+      - Provides structured uncertainty modeling for dates, quantities, etc.
+      - Aligned with CIDOC-CRM E52_Time-Span precision concepts
+      - Used by is_or_was_approximate slot
+    see_also:
+      - https://www.cidoc-crm.org/Entity/e52-time-span/version-7.1.3
+    examples:
+      - value:
+          approximation_level: EXACT
+          has_or_had_label: "1880-03-15"
+        description: Exact date with full precision
+      - value:
+          approximation_level: APPROXIMATE
+          has_or_had_label: "circa 1880"
+          has_or_had_description: "Founding date known only to year from newspaper accounts"
+        description: Approximate date with explanation
+      - value:
+          approximation_level: ESTIMATED
+          has_or_had_label: "estimated 1875-1885"
+          has_or_had_description: "Date range inferred from building construction records"
+        description: Estimated date range
+      - value:
+          approximation_level: UNKNOWN
+          has_or_had_label: "date unknown"
+          has_or_had_description: "No founding records survive"
+        description: Unknown date
+    annotations:
+      specificity_score: 0.30
+      specificity_rationale: >-
+        Approximation status is broadly useful across contexts where
+        uncertainty needs to be expressed.
+
+enums:
+  ApproximationLevelEnum:
+    description: Levels of approximation/uncertainty for values.
+    permissible_values:
+      EXACT:
+        description: Value is known with certainty
+      APPROXIMATE:
+        description: Value is close but not exact (circa, roughly)
+      ESTIMATED:
+        description: Value is calculated or inferred
+      UNCERTAIN:
+        description: Significant doubt about accuracy
+      UNKNOWN:
+        description: Value cannot be determined

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

@@ -0,0 +1,195 @@
+id: https://nde.nl/ontology/hc/class/area
+name: area_class
+title: Area Class
+description: >-
+  Class representing an area measurement with value, unit, and context.
+  
+  **RULE 53 COMPLIANT**: This is the authoritative class for area measurements,
+  replacing domain-specific float slots like area_hectares, building_floor_area_sqm,
+  and has_area_in_hectare.
+  
+  **REPLACES**:
+  - area_hectares (OutdoorSite) - float in hectares
+  - building_floor_area_sqm (HistoricBuilding) - float in square meters
+  - has_area_in_hectare (bespoke, incorrectly created)
+  
+  **ADVANTAGES OVER SIMPLE FLOAT**:
+  - Explicit unit specification (no ambiguity between m² and hectares)
+  - Temporal context (measurement date for historic facilities)
+  - Provenance (measurement method, source)
+  - Estimation flag (is_estimate for approximate values)
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  qudt: http://qudt.org/schema/qudt/
+  geosparql: http://www.opengis.net/ont/geosparql#
+
+imports:
+  - linkml:types
+  - ./MeasureUnit
+  - ../slots/has_or_had_unit
+  - ../slots/has_or_had_label
+
+default_prefix: hc
+
+classes:
+  Area:
+    description: >-
+      A measurement of spatial extent (area) with value, unit, and metadata.
+      
+      Captures area measurements for heritage facilities including outdoor sites,
+      buildings, rooms, and storage areas. Supports multiple units (m², hectares,
+      acres) with explicit unit specification.
+      
+      **TEMPORAL ASPECT**: Areas can change over time (building extensions,
+      site acquisitions). The measurement_date captures when the area was measured.
+      
+      **ESTIMATION SUPPORT**: Heritage facilities often have estimated areas,
+      especially for historic buildings. The is_estimate flag indicates uncertainty.
+    class_uri: qudt:QuantityValue
+    exact_mappings:
+      - qudt:QuantityValue
+    close_mappings:
+      - schema:QuantitativeValue
+      - geosparql:hasArea
+    slots:
+      - area_value
+      - has_or_had_unit
+      - measurement_date
+      - is_estimate
+      - measurement_method
+      - has_or_had_label
+    slot_usage:
+      area_value:
+        description: >-
+          The numeric value of the area measurement.
+          MIGRATED from area_hectares, building_floor_area_sqm (Rule 53).
+        range: float
+        required: true
+        examples:
+          - value: 25.0
+            description: 25 hectares (outdoor site)
+          - value: 5000.0
+            description: 5000 square meters (building)
+      has_or_had_unit:
+        description: >-
+          The unit of measurement for this area.
+          MIGRATED from implicit unit assumptions (Rule 53).
+        range: MeasureUnit
+        required: true
+        inlined: true
+        examples:
+          - value:
+              unit_type: HECTARE
+              unit_symbol: "ha"
+            description: Hectare unit for outdoor site
+          - value:
+              unit_type: SQUARE_METER
+              unit_symbol: "m²"
+            description: Square meter unit for building floor
+      measurement_date:
+        description: >-
+          Date when the area was measured or recorded.
+        range: date
+        required: false
+        examples:
+          - value: "2024-01-15"
+            description: Recent measurement
+          - value: "1985-06-01"
+            description: Historic measurement
+      is_estimate:
+        description: >-
+          Whether the area is an estimate (true) or precise measurement (false).
+        range: boolean
+        required: false
+        examples:
+          - value: true
+            description: Estimated area for historic building
+          - value: false
+            description: Precise surveyed measurement
+      measurement_method:
+        description: >-
+          Method used to measure the area (survey, GIS, historical records, etc.).
+        range: string
+        required: false
+        examples:
+          - value: "GIS analysis"
+            description: Geographic Information System measurement
+          - value: "Land survey"
+            description: Professional survey
+          - value: "Historical records"
+            description: From archival documents
+      has_or_had_label:
+        description: >-
+          Human-readable label for the area measurement.
+        range: string
+        examples:
+          - value: "Total site area"
+            description: Label for outdoor site
+          - value: "Building floor area"
+            description: Label for building
+    examples:
+      - value:
+          area_value: 25.0
+          has_or_had_unit:
+            unit_type: HECTARE
+            unit_symbol: "ha"
+          has_or_had_label: "Sculpture garden area"
+        description: Outdoor site area in hectares (replaces area_hectares)
+      - value:
+          area_value: 5000.0
+          has_or_had_unit:
+            unit_type: SQUARE_METER
+            unit_symbol: "m²"
+          measurement_date: "2023-03-15"
+          is_estimate: false
+          measurement_method: "Architectural survey"
+          has_or_had_label: "Total floor area"
+        description: Building floor area in square meters (replaces building_floor_area_sqm)
+      - value:
+          area_value: 650.0
+          has_or_had_unit:
+            unit_type: HECTARE
+            unit_symbol: "ha"
+          is_estimate: true
+          measurement_method: "Historical records"
+          has_or_had_label: "Estate grounds"
+        description: Historic estate grounds with estimated area
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: >-
+        Area measurements applicable to all heritage custodian types.
+      specificity_score: 0.4
+      specificity_rationale: >-
+        Broadly useful class - area measurements relevant for site planning,
+        collection storage, visitor capacity, and facility management.
+
+slots:
+  area_value:
+    description: >-
+      The numeric value of an area measurement.
+    range: float
+    slot_uri: qudt:numericValue
+    exact_mappings:
+      - qudt:numericValue
+      - schema:value
+
+  measurement_date:
+    description: >-
+      Date when a measurement was taken or recorded.
+    range: date
+    slot_uri: schema:dateCreated
+
+  is_estimate:
+    description: >-
+      Whether a value is an estimate (true) or precise measurement (false).
+    range: boolean
+    slot_uri: hc:isEstimate
+
+  measurement_method:
+    description: >-
+      Method used to obtain a measurement.
+    range: string
+    slot_uri: hc:measurementMethod

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

@@ -0,0 +1,180 @@
+id: https://nde.nl/ontology/hc/class/Asserter
+name: Asserter
+title: Asserter Class
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  prov: http://www.w3.org/ns/prov#
+  foaf: http://xmlns.com/foaf/0.1/
+  schema: http://schema.org/
+  dcterms: http://purl.org/dc/terms/
+imports:
+- linkml:types
+- ../enums/AsserterTypeEnum
+- ../slots/has_or_had_identifier
+- ../slots/has_or_had_label
+- ../slots/has_or_had_description
+- ../slots/specificity_annotation
+- ../slots/template_specificity
+- ./SpecificityAnnotation
+- ./TemplateSpecificityScores
+default_prefix: hc
+classes:
+  Asserter:
+    class_uri: prov:Agent
+    description: >-
+      An agent (person, organization, or system) responsible for making
+      an assertion about a heritage entity.
+      
+      **PROV-O ALIGNMENT**:
+      
+      Maps to `prov:Agent` - "An agent is something that bears some form
+      of responsibility for an activity taking place, for the existence
+      of an entity, or for another agent's activity."
+      
+      **TYPES OF ASSERTERS**:
+      
+      | Type | Description | Example |
+      |------|-------------|---------|
+      | HUMAN_ANALYST | Expert making judgment | "jane.doe@nde.nl" |
+      | AUTOMATED_SYSTEM | Software system | "primary-presence-classifier/1.0" |
+      | AI_AGENT | AI/ML model | "claude-opus-4", "opencode-claude-sonnet-4" |
+      | ORGANIZATION | Institution | "Noord-Hollands Archief" |
+      
+      **USE CASES**:
+      
+      1. **Attribution Tracking**: Who made this assertion about primary presence?
+      2. **Provenance Chain**: Trace assertions back to their source agent.
+      3. **Quality Assessment**: Different asserters may have different reliability.
+      4. **Accountability**: Identify responsible party for each assertion.
+      
+      **EXAMPLE**:
+      
+      ```yaml
+      Asserter:
+        asserter_id: https://nde.nl/ontology/hc/asserter/claude-opus-4
+        asserter_name: Claude Opus 4
+        asserter_type: AI_AGENT
+        asserter_description: Anthropic Claude AI model used for assertion generation
+        asserter_version: "claude-opus-4-20250514"
+      ```
+    exact_mappings:
+      - prov:Agent
+    close_mappings:
+      - foaf:Agent
+      - dcterms:Agent
+    related_mappings:
+      - schema:Person
+      - schema:Organization
+    slots:
+      - has_or_had_identifier
+      - has_or_had_label
+      - has_or_had_description
+      - asserter_type
+      - asserter_version
+      - asserter_contact
+      - specificity_annotation
+      - template_specificity
+    slot_usage:
+      has_or_had_identifier:
+        range: uriorcurie
+        required: true
+        identifier: true
+        description: >-
+          Unique identifier for this asserter.
+        examples:
+          - value: https://nde.nl/ontology/hc/asserter/claude-opus-4
+            description: AI agent asserter
+          - value: https://nde.nl/ontology/hc/asserter/jane-doe-nde
+            description: Human analyst asserter
+      has_or_had_label:
+        range: string
+        required: true
+        description: >-
+          Name of the asserter.
+        examples:
+          - value: Claude Opus 4
+            description: AI model name
+          - value: Dr. Jane Doe
+            description: Human analyst name
+          - value: primary-presence-classifier
+            description: Automated system name
+      has_or_had_description:
+        range: string
+        required: false
+        description: >-
+          Description of the asserter and their role in the assertion process.
+        examples:
+          - value: Anthropic Claude AI model used for heritage data assertions
+          - value: Senior digital heritage analyst at NDE
+      asserter_type:
+        range: AsserterTypeEnum
+        required: true
+        description: >-
+          The type of agent making the assertion.
+        examples:
+          - value: AI_AGENT
+          - value: HUMAN_ANALYST
+          - value: AUTOMATED_SYSTEM
+      asserter_version:
+        range: string
+        required: false
+        description: >-
+          Version identifier for software agents.
+        examples:
+          - value: "claude-opus-4-20250514"
+          - value: "1.2.3"
+      asserter_contact:
+        range: string
+        required: false
+        description: >-
+          Contact information for human or organizational asserters.
+        examples:
+          - value: jane.doe@nde.nl
+          - value: heritage-team@museum.nl
+    comments:
+      - Asserter models the agent responsible for making assertions
+      - Supports tracking of human, automated, and AI-based assertions
+      - Uses PROV-O Agent as primary ontology mapping
+      - Version tracking particularly important for AI/ML agents
+    see_also:
+      - https://www.w3.org/TR/prov-o/#Agent
+      - https://xmlns.com/foaf/spec/#term_Agent
+    examples:
+      - value:
+          has_or_had_identifier: https://nde.nl/ontology/hc/asserter/claude-opus-4
+          has_or_had_label: Claude Opus 4
+          asserter_type: AI_AGENT
+          has_or_had_description: Anthropic Claude AI model used for heritage data assertions
+          asserter_version: "claude-opus-4-20250514"
+        description: AI agent asserter
+      - value:
+          has_or_had_identifier: https://nde.nl/ontology/hc/asserter/jane-doe-nde
+          has_or_had_label: Dr. Jane Doe
+          asserter_type: HUMAN_ANALYST
+          has_or_had_description: Senior digital heritage analyst at NDE
+          asserter_contact: jane.doe@nde.nl
+        description: Human analyst asserter
+      - value:
+          has_or_had_identifier: https://nde.nl/ontology/hc/asserter/primary-presence-classifier
+          has_or_had_label: primary-presence-classifier
+          asserter_type: AUTOMATED_SYSTEM
+          has_or_had_description: Automated system for classifying primary digital presence
+          asserter_version: "1.0.0"
+        description: Automated system asserter
+slots:
+  asserter_type:
+    description: >-
+      The type of agent making the assertion (human, automated, AI, organization).
+    range: AsserterTypeEnum
+    slot_uri: hc:asserterType
+  asserter_version:
+    description: >-
+      Version identifier for software agents (automated systems or AI).
+    range: string
+    slot_uri: hc:asserterVersion
+  asserter_contact:
+    description: >-
+      Contact information for human or organizational asserters.
+    range: string
+    slot_uri: hc:asserterContact

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

@@ -0,0 +1,199 @@
+id: https://nde.nl/ontology/hc/class/Author
+name: author_class
+title: Author Class
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  dcterms: http://purl.org/dc/terms/
+  bf: http://id.loc.gov/ontologies/bibframe/
+  bibo: http://purl.org/ontology/bibo/
+  foaf: http://xmlns.com/foaf/0.1/
+  rico: https://www.ica.org/standards/RiC/ontology#
+imports:
+- linkml:types
+- ../metadata
+- ../slots/has_or_had_label
+- ../slots/has_or_had_description
+- ../slots/has_or_had_identifier
+- ./SpecificityAnnotation
+- ./TemplateSpecificityScores
+- ../slots/specificity_annotation
+- ../slots/template_specificity
+default_prefix: hc
+classes:
+  Author:
+    class_uri: schema:Person
+    description: >-
+      Person or organization that authored/created a creative work.
+      
+      **PURPOSE**:
+      
+      Author models the creator(s) of works produced by heritage custodians,
+      such as exhibition catalogs, research publications, finding aids, and
+      reports. Replaces simple string author lists with structured data.
+      
+      **ONTOLOGY ALIGNMENT**:
+      
+      | Ontology | Class/Property | Usage |
+      |----------|----------------|-------|
+      | **Schema.org** | `schema:Person`, `schema:author` | Primary class and property |
+      | **Dublin Core** | `dcterms:creator` | Creator relationship |
+      | **BIBFRAME** | `bf:Contribution`, `bf:Agent` | Bibliographic contributions |
+      | **FOAF** | `foaf:Person`, `foaf:name` | Personal information |
+      | **RiC-O** | `rico:Agent` | Archival agent modeling |
+      
+      **AUTHOR TYPES**:
+      
+      Authors may be:
+      - **Individual persons**: Named authors with affiliations
+      - **Organizations**: Corporate authors (e.g., "Rijksmuseum Staff")
+      - **Anonymous**: Works with unknown authorship
+      - **Collective**: Group authorships
+      
+      **ROLES**:
+      
+      Beyond simple "author", works may have multiple contributor types:
+      - Author (primary creator)
+      - Editor
+      - Compiler
+      - Translator
+      - Illustrator
+      - Contributor
+      
+      **EXAMPLE**:
+      
+      ```yaml
+      has_or_had_author:
+        - author_name: "Jan de Vries"
+          author_role: AUTHOR
+          author_affiliation: "Rijksmuseum Amsterdam"
+        - author_name: "Maria van Dijk"
+          author_role: EDITOR
+      ```
+    exact_mappings:
+      - schema:Person
+      - foaf:Person
+    close_mappings:
+      - bf:Agent
+      - rico:Agent
+    related_mappings:
+      - bf:Contribution
+      - dcterms:creator
+    slots:
+      - author_name
+      - author_role
+      - author_affiliation
+      - author_identifier
+      - has_or_had_identifier
+      - has_or_had_label
+      - has_or_had_description
+      - specificity_annotation
+      - template_specificity
+    slot_usage:
+      author_name:
+        range: string
+        required: true
+        description: >-
+          Full name of the author (person or organization).
+        examples:
+          - value: "Jan de Vries"
+            description: Individual author
+          - value: "Rijksmuseum Research Department"
+            description: Corporate author
+      author_role:
+        range: AuthorRoleEnum
+        required: false
+        ifabsent: "string(AUTHOR)"
+        description: >-
+          Role of this person in creating the work.
+        examples:
+          - value: AUTHOR
+            description: Primary author
+          - value: EDITOR
+            description: Editor
+      author_affiliation:
+        range: string
+        required: false
+        description: >-
+          Organization the author is affiliated with.
+        examples:
+          - value: "Rijksmuseum Amsterdam"
+            description: Museum affiliation
+          - value: "Universiteit van Amsterdam"
+            description: University affiliation
+      author_identifier:
+        range: uriorcurie
+        required: false
+        description: >-
+          Identifier for the author (ORCID, VIAF, etc.).
+        examples:
+          - value: "https://orcid.org/0000-0001-2345-6789"
+            description: ORCID identifier
+          - value: "https://viaf.org/viaf/12345678"
+            description: VIAF identifier
+    comments:
+      - Author replaces simple string author lists with structured data
+      - Supports both individual and organizational authors
+      - Includes roles (author, editor, compiler, etc.)
+      - Can link to identifier systems (ORCID, VIAF)
+    see_also:
+      - https://schema.org/author
+      - https://schema.org/Person
+      - http://id.loc.gov/ontologies/bibframe/Contribution
+    examples:
+      - value:
+          author_name: "Jan de Vries"
+          author_role: AUTHOR
+          author_affiliation: "Rijksmuseum Amsterdam"
+          author_identifier: "https://orcid.org/0000-0001-2345-6789"
+        description: Individual author with full metadata
+      - value:
+          author_name: "Maria van Dijk"
+          author_role: EDITOR
+        description: Editor with minimal metadata
+      - value:
+          author_name: "Rijksmuseum Research Department"
+          author_role: AUTHOR
+        description: Corporate author
+    annotations:
+      specificity_score: 0.35
+      specificity_rationale: >-
+        Authorship is broadly useful for creative/documentary works.
+
+slots:
+  author_name:
+    description: Full name of the author (person or organization).
+    range: string
+    slot_uri: schema:name
+  author_role:
+    description: Role of this person in creating the work.
+    range: string
+    slot_uri: hc:authorRole
+  author_affiliation:
+    description: Organization the author is affiliated with.
+    range: string
+    slot_uri: schema:affiliation
+  author_identifier:
+    description: Identifier for the author (ORCID, VIAF, etc.).
+    range: uriorcurie
+    slot_uri: schema:identifier
+
+enums:
+  AuthorRoleEnum:
+    description: Roles for contributors to a creative work.
+    permissible_values:
+      AUTHOR:
+        description: Primary creator of the work
+      EDITOR:
+        description: Person who edited the work
+      COMPILER:
+        description: Person who compiled/assembled the work
+      TRANSLATOR:
+        description: Person who translated the work
+      ILLUSTRATOR:
+        description: Person who created illustrations
+      CONTRIBUTOR:
+        description: General contributor
+      PHOTOGRAPHER:
+        description: Person who created photographs

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

@@ -0,0 +1,217 @@
+id: https://nde.nl/ontology/hc/class/BirthDate
+name: birth_date_class
+title: Birth Date Class
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  time: http://www.w3.org/2006/time#
+  pico: https://personsincontext.org/model#
+  dcterms: http://purl.org/dc/terms/
+  xsd: http://www.w3.org/2001/XMLSchema#
+imports:
+  - linkml:types
+  - ../metadata
+  - ../slots/specificity_annotation
+  - ../slots/template_specificity
+  - ./SpecificityAnnotation
+  - ./TemplateSpecificityScores
+default_prefix: hc
+classes:
+  BirthDate:
+    class_uri: schema:Date
+    description: >-
+      Structured representation of a person's birth date with support for
+      uncertainty, incomplete dates, and provenance tracking.
+      
+      **PURPOSE**:
+      
+      BirthDate replaces simple string birth_date slots to provide:
+      - EDTF (Extended Date/Time Format) support for uncertain/incomplete dates
+      - Provenance tracking for inferred dates (Rule 45)
+      - Confidence scoring
+      - Source preservation (original format from documents)
+      
+      **EDTF NOTATION** (Rule 44):
+      
+      | Pattern | Meaning | Example |
+      |---------|---------|---------|
+      | `YYYY` | Year only | `1970` |
+      | `YYYY-MM` | Year and month | `1970-08` |
+      | `YYYY-MM-DD` | Full date | `1970-08-15` |
+      | `YYYX` | Decade | `197X` (1970s) |
+      | `YYXX` | Century | `19XX` (1900s) |
+      | `YYYY~` | Approximate | `1985~` (circa 1985) |
+      | `YYYY?` | Uncertain | `1985?` (possibly 1985) |
+      | `XXXX` | Unknown | Must have search provenance |
+      
+      **INFERRED DATA** (Rule 45):
+      
+      When birth date is inferred (e.g., from earliest education date):
+      - Store in `inferred_birth_date` with full inference chain
+      - Set `is_inferred: true`
+      - Document inference method and sources
+      
+      **ONTOLOGY ALIGNMENT**:
+      
+      | Ontology | Mapping | Usage |
+      |----------|---------|-------|
+      | **Schema.org** | `schema:Date` | Primary class |
+      | **CIDOC-CRM** | `crm:E52_Time-Span` | Temporal extent |
+      | **PiCo** | Birth date observation | Source fidelity |
+      | **TIME** | `time:Instant` | Point in time |
+      
+      **EXAMPLE**:
+      
+      ```yaml
+      has_or_had_date_of_birth:
+        birth_edtf: "1970-08-15"
+        birth_iso_date: "1970-08-15"
+        is_inferred: false
+        confidence: high
+      ```
+    exact_mappings:
+      - schema:Date
+    close_mappings:
+      - crm:E52_Time-Span
+      - time:Instant
+    related_mappings:
+      - pico:PersonObservation
+    slots:
+      - birth_edtf
+      - birth_iso_date
+      - birth_source_text
+      - is_inferred
+      - inference_provenance
+      - confidence
+      - specificity_annotation
+      - template_specificity
+    slot_usage:
+      birth_edtf:
+        range: string
+        required: true
+        description: >-
+          Birth date in EDTF notation (Extended Date/Time Format).
+          Supports incomplete dates, uncertainty, and approximation.
+        examples:
+          - value: "1970-08-15"
+            description: Full date known
+          - value: "1970-08"
+            description: Year and month known
+          - value: "1970"
+            description: Only year known
+          - value: "197X"
+            description: Decade known (1970s)
+          - value: "1970~"
+            description: Approximate (circa 1970)
+          - value: "XXXX"
+            description: Unknown (requires search provenance)
+      birth_iso_date:
+        range: date
+        required: false
+        description: >-
+          Birth date as ISO 8601 date (YYYY-MM-DD) when full date is known.
+          Optional - use birth_edtf for partial/uncertain dates.
+        examples:
+          - value: "1970-08-15"
+      birth_source_text:
+        range: string
+        required: false
+        description: >-
+          Original date text from source document, preserved verbatim.
+          Useful for archival/historical sources with non-standard notation.
+        examples:
+          - value: "born in the year of our Lord 1823"
+          - value: "ca. 1750"
+          - value: "late 18th century"
+      is_inferred:
+        range: boolean
+        required: false
+        ifabsent: "false"
+        description: >-
+          Whether this birth date was inferred (vs. directly extracted).
+          If true, inference_provenance MUST be provided per Rule 45.
+      inference_provenance:
+        range: string
+        required: false
+        description: >-
+          JSON string documenting inference chain per Rule 45.
+          Required when is_inferred is true.
+        examples:
+          - value: '{"method": "earliest_education_heuristic", "inference_chain": [...]}'
+      confidence:
+        range: BirthDateConfidenceEnum
+        required: false
+        description: >-
+          Confidence level in the birth date value.
+    comments:
+      - "Replaces simple birth_date string slot (Rule 53)"
+      - "EDTF notation enables uncertain/incomplete date representation"
+      - "Inference provenance required when is_inferred=true (Rule 45)"
+      - "Source text preservation supports archival/historical research"
+    see_also:
+      - https://www.loc.gov/standards/datetime/
+      - https://schema.org/birthDate
+    examples:
+      - value:
+          birth_edtf: "1970-08-15"
+          birth_iso_date: "1970-08-15"
+          is_inferred: false
+          confidence: HIGH
+        description: Full date known with high confidence
+      - value:
+          birth_edtf: "197X"
+          is_inferred: true
+          inference_provenance: '{"method": "earliest_education_heuristic", "source_field": "education[0].start_year"}'
+          confidence: LOW
+        description: Decade inferred from education start year
+      - value:
+          birth_edtf: "1823"
+          birth_source_text: "born in the year of our Lord 1823"
+          is_inferred: false
+          confidence: MEDIUM
+        description: Year extracted from historical document
+    annotations:
+      specificity_score: 0.45
+      specificity_rationale: >-
+        Birth dates are relevant for person research across all heritage sectors.
+
+slots:
+  birth_edtf:
+    description: Birth date in EDTF notation.
+    range: string
+    slot_uri: dcterms:date
+  birth_iso_date:
+    description: Birth date as ISO 8601 date when full date is known.
+    range: date
+    slot_uri: schema:birthDate
+  birth_source_text:
+    description: Original date text from source document.
+    range: string
+    slot_uri: hc:sourceText
+  is_inferred:
+    description: Whether this date was inferred.
+    range: boolean
+    slot_uri: hc:isInferred
+  inference_provenance:
+    description: JSON documenting inference chain.
+    range: string
+    slot_uri: hc:inferenceProvenance
+  confidence:
+    description: Confidence level in the date value.
+    range: string
+    slot_uri: hc:confidence
+
+enums:
+  BirthDateConfidenceEnum:
+    description: Confidence levels for birth date values.
+    permissible_values:
+      HIGH:
+        description: Full date from authoritative source (e.g., birth certificate)
+      MEDIUM:
+        description: Date from reliable source (e.g., official biography)
+      LOW:
+        description: Date inferred or from uncertain source
+      VERY_LOW:
+        description: Decade/century estimated from indirect evidence

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

@@ -0,0 +1,223 @@
+id: https://nde.nl/ontology/hc/class/BirthPlace
+name: birth_place_class
+title: Birth Place Class
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  crm: http://www.cidoc-crm.org/cidoc-crm/
+  gn: http://www.geonames.org/ontology#
+  wdt: http://www.wikidata.org/prop/direct/
+imports:
+  - linkml:types
+  - ../metadata
+  - ../slots/specificity_annotation
+  - ../slots/template_specificity
+  - ./SpecificityAnnotation
+  - ./TemplateSpecificityScores
+default_prefix: hc
+classes:
+  BirthPlace:
+    class_uri: schema:Place
+    description: >-
+      Structured representation of a person's place of birth with support
+      for historical place names, modern equivalents, and geographic identifiers.
+      
+      **PURPOSE**:
+      
+      BirthPlace replaces simple string birth_place slots to provide:
+      - Historical place name preservation
+      - Modern place name linkage
+      - Geographic identifier integration (GeoNames, Wikidata)
+      - Coordinate storage for mapping applications
+      
+      **HISTORICAL VS. MODERN NAMES**:
+      
+      Many birth places used historical names that have since changed:
+      - "Batavia" → "Jakarta"
+      - "Bombay" → "Mumbai"
+      - "Leningrad" → "St. Petersburg"
+      - "Saigon" → "Ho Chi Minh City"
+      
+      BirthPlace preserves the source name while linking to modern identifiers.
+      
+      **GEOGRAPHIC RESOLUTION**:
+      
+      Per AGENTS.md Rule on GeoNames as authoritative source:
+      - `geonames_id`: Links to GeoNames for standardization
+      - `wikidata_id`: Links to Wikidata for additional context
+      - `coordinates`: Lat/lon for mapping
+      
+      **ONTOLOGY ALIGNMENT**:
+      
+      | Ontology | Mapping | Usage |
+      |----------|---------|-------|
+      | **Schema.org** | `schema:Place` | Primary class |
+      | **CIDOC-CRM** | `crm:E53_Place` | Place entity |
+      | **GeoNames** | `gn:Feature` | Geographic feature |
+      
+      **EXAMPLE**:
+      
+      ```yaml
+      has_or_had_place_of_birth:
+        place_name: "Batavia"
+        modern_place_name: "Jakarta"
+        country_code: "ID"
+        geonames_id: 1642911
+        wikidata_id: "Q3630"
+      ```
+    exact_mappings:
+      - schema:Place
+    close_mappings:
+      - crm:E53_Place
+      - gn:Feature
+    slots:
+      - place_name
+      - modern_place_name
+      - country_code
+      - region_code
+      - geonames_id
+      - wikidata_id
+      - coordinates
+      - place_source_text
+      - specificity_annotation
+      - template_specificity
+    slot_usage:
+      place_name:
+        range: string
+        required: true
+        description: >-
+          Name of the birth place as recorded in source.
+          May be historical name that has since changed.
+        examples:
+          - value: "Amsterdam"
+            description: Current name
+          - value: "Batavia"
+            description: Historical name (now Jakarta)
+      modern_place_name:
+        range: string
+        required: false
+        description: >-
+          Modern equivalent name if place_name is historical.
+          Leave null if place_name is current.
+        examples:
+          - value: "Jakarta"
+            description: Modern name for Batavia
+      country_code:
+        range: string
+        required: false
+        pattern: "^[A-Z]{2}$"
+        description: >-
+          ISO 3166-1 alpha-2 country code.
+        examples:
+          - value: "NL"
+          - value: "ID"
+      region_code:
+        range: string
+        required: false
+        description: >-
+          ISO 3166-2 region/province code or GeoNames admin1 code.
+        examples:
+          - value: "NH"
+            description: Noord-Holland
+      geonames_id:
+        range: integer
+        required: false
+        description: >-
+          GeoNames geographic identifier for the place.
+          Authoritative source per AGENTS.md.
+        examples:
+          - value: 2759794
+            description: Amsterdam GeoNames ID
+      wikidata_id:
+        range: string
+        required: false
+        pattern: "^Q[0-9]+$"
+        description: >-
+          Wikidata entity identifier for the place.
+        examples:
+          - value: "Q727"
+            description: Amsterdam Wikidata ID
+      coordinates:
+        range: string
+        required: false
+        description: >-
+          Geographic coordinates as "lat,lon" string.
+        examples:
+          - value: "52.3676,4.9041"
+            description: Amsterdam coordinates
+      place_source_text:
+        range: string
+        required: false
+        description: >-
+          Original place text from source document, preserved verbatim.
+          Useful when source contains additional context.
+        examples:
+          - value: "born at the family estate in rural Gelderland"
+    comments:
+      - "Replaces simple birth_place string slot (Rule 53)"
+      - "Preserves historical place names while linking to modern identifiers"
+      - "GeoNames ID is authoritative per AGENTS.md"
+    see_also:
+      - https://schema.org/birthPlace
+      - https://www.geonames.org/
+    examples:
+      - value:
+          place_name: "Amsterdam"
+          country_code: "NL"
+          region_code: "NH"
+          geonames_id: 2759794
+          wikidata_id: "Q727"
+          coordinates: "52.3676,4.9041"
+        description: Birth place with full geographic resolution
+      - value:
+          place_name: "Batavia"
+          modern_place_name: "Jakarta"
+          country_code: "ID"
+          geonames_id: 1642911
+          wikidata_id: "Q3630"
+        description: Historical place name with modern equivalent
+      - value:
+          place_name: "rural Gelderland"
+          country_code: "NL"
+          region_code: "GE"
+          place_source_text: "born at the family estate in rural Gelderland"
+        description: Imprecise location from archival source
+    annotations:
+      specificity_score: 0.45
+      specificity_rationale: >-
+        Birth places are relevant for person research across heritage sectors.
+
+slots:
+  place_name:
+    description: Name of the place as recorded in source.
+    range: string
+    slot_uri: schema:name
+  modern_place_name:
+    description: Modern equivalent name if different from source name.
+    range: string
+    slot_uri: hc:modernPlaceName
+  country_code:
+    description: ISO 3166-1 alpha-2 country code.
+    range: string
+    slot_uri: schema:addressCountry
+  region_code:
+    description: ISO 3166-2 region/province code.
+    range: string
+    slot_uri: schema:addressRegion
+  geonames_id:
+    description: GeoNames geographic identifier.
+    range: integer
+    slot_uri: gn:geonamesId
+  wikidata_id:
+    description: Wikidata entity identifier.
+    range: string
+    slot_uri: wdt:P625
+  coordinates:
+    description: Geographic coordinates as lat,lon string.
+    range: string
+    slot_uri: schema:geo
+  place_source_text:
+    description: Original place text from source document.
+    range: string
+    slot_uri: hc:sourceText

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

@@ -9,8 +9,15 @@ imports:
 - ../slots/has_or_had_description
 - ../slots/has_or_had_identifier
 - ../slots/has_or_had_label
-- ../slots/branch_service_area
+# REMOVED - migrated to has_or_had_service_area (Rule 53)
-- ../slots/branch_staff_count
+# - ../slots/branch_service_area
+- ../slots/has_or_had_service_area
+- ./ServiceArea
+# REMOVED - migrated to has_or_had_quantity (Rule 53)
+# - ../slots/branch_staff_count
+- ../slots/has_or_had_quantity
+- ./Quantity
+- ../enums/QuantityTypeEnum
 - ../slots/has_local_collection
 - ../slots/is_public_facing
 - ../slots/operating_hour
@@ -69,8 +76,12 @@ classes:
     - has_or_had_description
     - has_or_had_identifier
     - has_or_had_label
-    - branch_service_area
+    # REMOVED - migrated to has_or_had_service_area (Rule 53)
-    - branch_staff_count
+    # - branch_service_area
+    - has_or_had_service_area
+    # REMOVED - migrated to has_or_had_quantity (Rule 53)
+    # - branch_staff_count
+    - has_or_had_quantity
     - has_local_collection
     - is_public_facing
     - operating_hour
@@ -115,13 +126,27 @@ classes:
         - value: Regional branch serving Zaanstreek-Waterland area. Holds municipal records from Zaandam, Wormerland, Purmerend.
             Open to researchers Tuesday-Thursday.
           description: Archive branch description
-      branch_service_area:
+      # REMOVED - migrated to has_or_had_service_area (Rule 53)
-        range: string
+      # branch_service_area:
+      #   range: string
+      #   examples:
+      #   - value: Zaanstreek-Waterland region
+      #     description: Regional coverage
+      #   - value: Amsterdam Schiphol Airport travelers
+      #     description: Specific community served
+      has_or_had_service_area:
+        range: ServiceArea
+        inlined: true
+        description: >-
+          Geographic area or community served by this branch.
+          MIGRATED from branch_service_area (Rule 53) - changed from string to
+          ServiceArea class for richer geographic modeling.
         examples:
-        - value: Zaanstreek-Waterland region
+        - value:
-          description: Regional coverage
+            service_area_id: https://nde.nl/ontology/hc/servicearea/zaanstreek-waterland
-        - value: Amsterdam Schiphol Airport travelers
+            service_area_name: Zaanstreek-Waterland region
-          description: Specific community served
+            service_area_type: REGIONAL
+          description: Regional coverage as structured ServiceArea
       is_public_facing:
         range: boolean
         required: true
@@ -144,11 +169,28 @@ classes:
         examples:
         - value: Tu-Th 09:00-17:00
           description: Limited weekday hours
-      branch_staff_count:
+      # REMOVED - migrated to has_or_had_quantity (Rule 53)
-        range: integer
+      # branch_staff_count:
+      #   range: integer
+      #   examples:
+      #   - value: 3
+      #     description: Small branch staff
+      has_or_had_quantity:
+        range: Quantity
+        inlined: true
+        description: >-
+          Quantified values associated with this branch office (e.g., staff count).
+          MIGRATED from branch_staff_count (Rule 53) - changed from integer to
+          Quantity class for richer measurement context (units, dates, estimates).
         examples:
-        - value: 3
+        - value:
-          description: Small branch staff
+            quantity_value: 3
+            quantity_type: STAFF_COUNT
+            quantity_unit: FTE
+            has_or_had_description: Staff assigned to this branch
+            quantity_date: '2025-01-01'
+            is_estimate: false
+          description: Branch staff count as structured Quantity
       has_local_collection:
         range: boolean
         examples:
@@ -177,14 +219,21 @@ classes:
         has_or_had_label: Noord-Hollands Archief - Zaanstreek-Waterland
         has_or_had_description: Regional branch serving Zaanstreek-Waterland area. Holds municipal records from Zaandam,
           Wormerland, Purmerend.
-        branch_service_area: Zaanstreek-Waterland region
+        has_or_had_service_area:
+          service_area_id: https://nde.nl/ontology/hc/servicearea/zaanstreek-waterland
+          service_area_name: Zaanstreek-Waterland region
+          service_area_type: REGIONAL
         is_public_facing: true
         services_offered:
         - Archival research access
         - Genealogical consultations
         - Local history reference
         operating_hours: Tu-Th 09:00-17:00
-        branch_staff_count: 3
+        has_or_had_quantity:
+          quantity_value: 3
+          quantity_type: STAFF_COUNT
+          quantity_unit: FTE
+          has_or_had_description: Staff assigned to Zaanstreek-Waterland branch
         has_local_collection: true
       description: Regional archive branch
     - value:
@@ -192,12 +241,19 @@ classes:
         has_or_had_label: Rijksmuseum Schiphol
         has_or_had_description: Exhibition space at Schiphol Airport featuring rotating highlights from the Rijksmuseum
           collection. Free admission.
-        branch_service_area: Amsterdam Schiphol Airport travelers
+        has_or_had_service_area:
+          service_area_id: https://nde.nl/ontology/hc/servicearea/schiphol-travelers
+          service_area_name: Amsterdam Schiphol Airport travelers
+          service_area_type: COMMUNITY
         is_public_facing: true
         services_offered:
         - Exhibition viewing
         - Museum shop
         operating_hours: Daily 07:00-20:00
-        branch_staff_count: 5
+        has_or_had_quantity:
+          quantity_value: 5
+          quantity_type: STAFF_COUNT
+          quantity_unit: FTE
+          has_or_had_description: Staff assigned to Schiphol branch
         has_local_collection: false
       description: Museum airport branch

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

@@ -13,7 +13,10 @@ imports:
 - ../slots/has_approval_date
 - ../slots/has_or_had_acquisition_budget
 - ../slots/is_or_was_approved_by  # MIGRATED: was ../slots/approved_by (2026-01-15)
-- ../slots/budget_currency
+# REMOVED - migrated to has_or_had_currency (Rule 53)
+# - ../slots/budget_currency
+- ../slots/has_or_had_currency
+- ./Currency
 - ../slots/has_or_had_description
 - ../slots/has_or_had_label
 # REMOVED - migrated to has_or_had_status with range BudgetStatus (Rule 53)
@@ -97,7 +100,9 @@ classes:
     - has_or_had_acquisition_budget
     - has_approval_date
     - is_or_was_approved_by  # MIGRATED: was approved_by (2026-01-15)
-    - budget_currency
+    # REMOVED - migrated to has_or_had_currency (Rule 53)
+    # - budget_currency
+    - has_or_had_currency
     - has_or_had_description
     - has_or_had_label
     # MIGRATED from budget_status to has_or_had_status (Rule 53)
@@ -209,13 +214,33 @@ classes:
         examples:
         - value: 45000000.0
           description: EUR 45 million annual budget
-      budget_currency:
+      # REMOVED - migrated to has_or_had_currency (Rule 53)
-        range: string
+      # budget_currency:
+      #   range: string
+      #   required: true
+      #   examples:
+      #   - value: EUR
+      #     description: Euro currency
+      #   - value: USD
+      #     description: US Dollar currency
+      has_or_had_currency:
+        range: Currency
+        inlined: true
         required: true
+        description: >-
+          Currency for all monetary amounts in this budget.
+          MIGRATED from budget_currency (Rule 53) - changed from string to
+          Currency class for richer currency metadata (ISO 4217 code, symbol, name).
         examples:
-        - value: EUR
+        - value:
-          description: Euro currency
+            currency_code: EUR
-        - value: USD
+            has_or_had_label: Euro
+            currency_symbol: €
+          description: Euro currency as structured Currency object
+        - value:
+            currency_code: USD
+            has_or_had_label: US Dollar
+            currency_symbol: $
           description: US Dollar currency
       operating_budget:
         range: decimal
@@ -250,9 +275,12 @@ classes:
       has_approval_date:
         range: date
         required: false
-      is_or_was_is_or_was_approved_by:  # MIGRATED: was was_approved_by (2026-01-15)
+      is_or_was_approved_by:
-        description: Agent (person/organization) that approved this budget
+        description: >-
-        range: string
+          Agent (person/organization) that approved this budget.
+          MIGRATED from approved_by (2026-01-15) per Rule 39.
+          Range changed from string to Approver class for structured approval tracking.
+        range: Approver
         required: false
       # MIGRATED from budget_status to has_or_had_status (Rule 53)
       # budget_status:
@@ -324,7 +352,10 @@ classes:
         fiscal_year_start: '2024-01-01'
         fiscal_year_end: '2024-12-31'
         total_budget_amount: 45000000.0
-        budget_currency: EUR
+        has_or_had_currency:
+          currency_code: EUR
+          has_or_had_label: Euro
+          currency_symbol: €
         operating_budget: 38000000.0
         capital_budget: 3000000.0
         acquisition_budget: 2000000.0
@@ -336,7 +367,8 @@ classes:
         internal_funding: 25000000.0
         endowment_draw: 5000000.0
         approval_date: '2023-11-15'
-        is_or_was_approved_by: Board of Directors
+        is_or_was_approved_by:
+          approver_name: Board of Directors
         has_or_had_status:
           value: ACTIVE
           effective_date: '2024-01-01'
@@ -352,7 +384,10 @@ classes:
         fiscal_year_start: '2024-04-01'
         fiscal_year_end: '2025-03-31'
         total_budget_amount: 8500000.0
-        budget_currency: EUR
+        has_or_had_currency:
+          currency_code: EUR
+          has_or_had_label: Euro
+          currency_symbol: €
         operating_budget: 7500000.0
         capital_budget: 500000.0
         personnel_budget: 5200000.0
@@ -360,7 +395,8 @@ classes:
         external_funding: 6000000.0
         internal_funding: 2500000.0
         approval_date: '2024-03-01'
-        is_or_was_approved_by: Province of Noord-Holland
+        is_or_was_approved_by:
+          approver_name: Province of Noord-Holland
         has_or_had_status:
           value: ACTIVE
           effective_date: '2024-04-01'

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

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

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

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

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

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

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

@@ -0,0 +1,173 @@
+id: https://nde.nl/ontology/hc/class/Currency
+name: Currency
+title: Currency Class
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  qudt: http://qudt.org/schema/qudt/
+  dcterms: http://purl.org/dc/terms/
+imports:
+- linkml:types
+- ../slots/has_or_had_identifier
+- ../slots/has_or_had_label
+- ../slots/has_or_had_description
+- ../slots/specificity_annotation
+- ../slots/template_specificity
+- ./SpecificityAnnotation
+- ./TemplateSpecificityScores
+default_prefix: hc
+classes:
+  Currency:
+    class_uri: schema:Currency
+    description: >-
+      A currency used for monetary values.
+      
+      **SCHEMA.ORG ALIGNMENT**:
+      
+      Maps to `schema:Currency` - "A currency as defined by ISO 4217."
+      
+      **ISO 4217 STANDARD**:
+      
+      ISO 4217 defines three-letter currency codes:
+      
+      | Code | Currency | Symbol |
+      |------|----------|--------|
+      | EUR | Euro | € |
+      | USD | US Dollar | $ |
+      | GBP | British Pound | £ |
+      | JPY | Japanese Yen | ¥ |
+      | CHF | Swiss Franc | CHF |
+      
+      **WHY NOT JUST USE STRING?**
+      
+      Simple string fields like `budget_currency: "EUR"` lose important context:
+      - Symbol for display purposes
+      - Full name for accessibility
+      - Historical validity (currencies change over time)
+      - Link to authoritative ISO 4217 standard
+      
+      The Currency class captures this richness while remaining simple for basic use.
+      
+      **HISTORICAL CURRENCIES**:
+      
+      Heritage institutions often deal with historical currencies:
+      - NLG (Dutch Guilder) - replaced by EUR in 2002
+      - DEM (German Mark) - replaced by EUR in 2002
+      - FRF (French Franc) - replaced by EUR in 2002
+      
+      The temporal naming pattern (has_or_had_currency) accommodates this.
+      
+      **EXAMPLE**:
+      
+      ```yaml
+      Currency:
+        currency_code: EUR
+        currency_name: Euro
+        currency_symbol: €
+      ```
+    exact_mappings:
+      - schema:Currency
+    close_mappings:
+      - qudt:CurrencyUnit
+    slots:
+      - has_or_had_identifier
+      - currency_code
+      - has_or_had_label
+      - currency_symbol
+      - has_or_had_description
+      - specificity_annotation
+      - template_specificity
+    slot_usage:
+      has_or_had_identifier:
+        range: uriorcurie
+        required: false
+        identifier: true
+        description: >-
+          Optional identifier for this currency.
+        examples:
+          - value: https://nde.nl/ontology/hc/currency/EUR
+            description: Euro currency identifier
+      currency_code:
+        range: string
+        required: true
+        pattern: "^[A-Z]{3}$"
+        description: >-
+          ISO 4217 three-letter currency code.
+        examples:
+          - value: EUR
+            description: Euro
+          - value: USD
+            description: US Dollar
+          - value: GBP
+            description: British Pound
+          - value: NLG
+            description: Dutch Guilder (historical)
+      has_or_had_label:
+        range: string
+        required: false
+        description: >-
+          Full name of the currency.
+        examples:
+          - value: Euro
+          - value: US Dollar
+          - value: Dutch Guilder
+      currency_symbol:
+        range: string
+        required: false
+        description: >-
+          Currency symbol for display.
+        examples:
+          - value: €
+            description: Euro symbol
+          - value: $
+            description: Dollar symbol
+          - value: £
+            description: Pound symbol
+          - value: ƒ
+            description: Guilder symbol (historical)
+      has_or_had_description:
+        range: string
+        required: false
+        description: >-
+          Additional information about the currency, such as historical context.
+        examples:
+          - value: Official currency of the Eurozone since 1999
+          - value: Dutch national currency until replaced by Euro in 2002
+    comments:
+      - Currency models monetary unit with ISO 4217 code and metadata
+      - Replaces simple string currency fields with structured data
+      - Uses Schema.org Currency as primary ontology mapping
+      - Supports both current and historical currencies
+    see_also:
+      - https://schema.org/Currency
+      - https://www.iso.org/iso-4217-currency-codes.html
+    examples:
+      - value:
+          currency_code: EUR
+          has_or_had_label: Euro
+          currency_symbol: €
+          has_or_had_description: Official currency of the Eurozone
+        description: Euro currency
+      - value:
+          currency_code: NLG
+          has_or_had_label: Dutch Guilder
+          currency_symbol: ƒ
+          has_or_had_description: Dutch national currency until replaced by Euro in 2002
+        description: Historical Dutch Guilder
+      - value:
+          currency_code: USD
+          has_or_had_label: US Dollar
+          currency_symbol: $
+        description: US Dollar currency
+slots:
+  currency_code:
+    description: >-
+      ISO 4217 three-letter currency code.
+    range: string
+    slot_uri: schema:currency
+  currency_symbol:
+    description: >-
+      Currency symbol for display purposes.
+    range: string
+    slot_uri: hc:currencySymbol

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

@@ -27,7 +27,7 @@ imports:
 - ./Notes
 - ../slots/has_archive_description
 - ../slots/has_archive_name
-- ../slots/arrangement_notes
+# REMOVED 2026-01-15: ../slots/arrangement_notes - migrated to has_arrangement_note
 - ../slots/has_or_had_assigned_processor
 - ../slots/creating_agency
 - ../slots/has_or_had_custodian_type
@@ -79,7 +79,6 @@ classes:
     - has_or_had_notes
     - has_archive_description
     - has_archive_name
-    - arrangement_notes
     - has_or_had_assigned_processor
     - creating_agency
     - has_or_had_custodian_type

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

@@ -14,7 +14,9 @@ imports:
 - ./GeoSpatialPlace
 - ../enums/PlaceSpecificityEnum
 - ./ReconstructedEntity
-- ../slots/auxiliary_places
+# REMOVED - migrated to has_or_had_auxiliary_entities with range AuxiliaryPlace (Rule 53)
+# - ../slots/auxiliary_places
+- ../slots/has_or_had_auxiliary_entities
 - ../slots/place_name
 - ../slots/place_language
 - ../slots/place_specificity
@@ -65,7 +67,9 @@ classes:
     - prov:Entity
     - crm:E27_Site
     slots:
-    - auxiliary_places
+    # MIGRATED from auxiliary_places to has_or_had_auxiliary_entities (Rule 53)
+    # - auxiliary_places
+    - has_or_had_auxiliary_entities
     - country
     - has_feature_type
     - has_geospatial_location
@@ -171,7 +175,11 @@ classes:
             has_accuracy_in_meters: 50.0
             spatial_resolution: NEIGHBORHOOD
           description: Approximate location from neighborhood reference
-      has_auxiliary_place:
+      # MIGRATED from auxiliary_places / has_auxiliary_place (Rule 53)
+      has_or_had_auxiliary_entities:
+        description: |
+          MIGRATED from auxiliary_places (Rule 53).
+          Subordinate or auxiliary locations associated with this custodian place.
         range: AuxiliaryPlace
         multivalued: true
         inlined_as_list: true
@@ -211,7 +219,7 @@ classes:
     - Link to GeoSpatialPlace via has_geospatial_location slot (TOOI pattern)
     - Can be vague ('the mansion') or specific ('het museum op het Museumplein 1')
     - Historical place names capture how custodians were referenced in archival documents
-    - 'NEW: auxiliary_places links to subordinate AuxiliaryPlace sites (depots, branches, labs)'
+    - 'MIGRATED: auxiliary_places → has_or_had_auxiliary_entities for AuxiliaryPlace sites (depots, branches, labs)'
     - Hierarchical pattern mirrors CustodianName → CustodianAppellation relationship
     see_also:
     - http://www.cidoc-crm.org/html/cidoc_crm_v7.1.3.html#E53

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

@@ -18,7 +18,10 @@ imports:
 - ../enums/DataTierEnum
 - ../enums/DatePrecisionEnum
 - ../enums/TimelineExtractionMethodEnum
-- ../slots/approximate
+# REMOVED - migrated to is_or_was_approximate (Rule 53)
+# - ../slots/approximate
+- ../slots/is_or_was_approximate
+- ./ApproximationStatus
 - ../slots/has_archive_path
 - ../slots/data_tier
 - ../slots/date_precision
@@ -53,8 +56,8 @@ classes:
       \ Scope decrease (ingekrompen)\n- REORGANIZATION: Complex restructuring (herstructurering)\n\n**EXCLUDED EVENT TYPES**\n\
       \nSome patterns are NOT mapped to events:\n- predecessor: This is a relationship, not an event\n- friends_org: Separate\
       \ organization (Vrienden van...)\n- reopening: Not in OrganizationalChangeEventTypeEnum\n\n**EXAMPLE USAGE**\n\n```yaml\n\
-      timeline_events:\n  - event_type: FOUNDING\n    event_date: \"2005-04-30\"\n    date_precision: day\n    approximate:\
+      timeline_events:\n  - event_type: FOUNDING\n    event_date: \"2005-04-30\"\n    date_precision: day\n    is_or_was_approximate:\n\
-      \ false\n    description: >-\n      Het RHC Drents Archief werd opgericht op 30 april 2005.\n      Het is de voortzetting\
+      \      approximation_level: EXACT\n    description: >-\n      Het RHC Drents Archief werd opgericht op 30 april 2005.\n      Het is de voortzetting\
       \ van het Rijksarchief in Drenthe (sinds 2000).\n    source_url:\n      - \"https://nl.wikipedia.org/wiki/Drents_Archief\"\
       \n      - \"https://bizzy.ai/nl/nl/52454037/regionaal-historisch-centrum-rhc-drents-archief\"\n    extraction_method:\
       \ api_response_regex\n    extraction_timestamp: \"2025-12-16T10:00:00Z\"\n    extraction_notes: >-\n      Query: \"\
@@ -67,7 +70,9 @@ classes:
     - tooi:Wijzigingsgebeurtenis
     - schema:Event
     slots:
-    - approximate
+    # REMOVED - migrated to is_or_was_approximate (Rule 53)
+    # - approximate
+    - is_or_was_approximate
     - archive_path
     - data_tier
     - date_precision
@@ -88,8 +93,26 @@ classes:
         required: false
       date_precision:
         required: true
-      is_approximate:
+      # REMOVED - migrated to is_or_was_approximate (Rule 53)
+      # is_approximate:
+      #   required: true
+      is_or_was_approximate:
+        range: ApproximationStatus
+        inlined: true
         required: true
+        description: >-
+          Whether the event date is approximate or uncertain.
+          MIGRATED from approximate (Rule 53) - changed from boolean to
+          ApproximationStatus class for structured uncertainty modeling.
+        examples:
+          - value:
+              approximation_level: EXACT
+            description: Exact date known
+          - value:
+              approximation_level: APPROXIMATE
+              has_or_had_label: "circa 1880"
+              has_or_had_description: "Founding date known only to year"
+            description: Approximate date with explanation
       description:
         required: true
       source_url:
@@ -134,7 +157,8 @@ classes:
         event_type: FOUNDING
         event_date: '2005-04-30'
         date_precision: day
-        approximate: false
+        is_or_was_approximate:
+          approximation_level: EXACT
         description: Het RHC Drents Archief werd opgericht op 30 april 2005.
         source_url:
         - https://nl.wikipedia.org/wiki/Drents_Archief
@@ -148,7 +172,8 @@ classes:
         event_type: MERGER
         event_date: '2005'
         date_precision: year
-        approximate: false
+        is_or_was_approximate:
+          approximation_level: EXACT
         description: In 2005 ging het Gemeentearchief Assen op in het Drents Archief.
         source_url:
         - https://nl.wikipedia.org/wiki/Drents_Archief
@@ -160,7 +185,8 @@ classes:
         event_type: FOUNDING
         event_date: '1810'
         date_precision: year
-        approximate: false
+        is_or_was_approximate:
+          approximation_level: EXACT
         description: The Rijksmuseum was founded in 1810 as the Royal Museum.
         source_url:
         - https://www.wikidata.org/wiki/Q190804
@@ -173,7 +199,8 @@ classes:
         event_type: TRANSFER
         event_date: '1885'
         date_precision: year
-        approximate: false
+        is_or_was_approximate:
+          approximation_level: EXACT
         description: The Rijksmuseum moved to its current building designed by Cuypers.
         source_url:
         - https://www.rijksmuseum.nl/en/about-us/what-we-do/history
@@ -183,3 +210,16 @@ classes:
         archive_path: web/0001/rijksmuseum.nl/about-us/rendered.html
         data_tier: TIER_2_VERIFIED
       description: Relocation event from institutional website
+    - value:
+        event_type: FOUNDING
+        event_date: '1880'
+        date_precision: year
+        is_or_was_approximate:
+          approximation_level: APPROXIMATE
+          has_or_had_label: "circa 1880"
+          has_or_had_description: "Founding date derived from secondary sources, exact year uncertain"
+        description: Museum founded around 1880, exact date unknown.
+        extraction_method: manual_research
+        extraction_timestamp: '2025-12-20T16:00:00Z'
+        data_tier: TIER_4_INFERRED
+      description: Founding event with approximate date

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

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

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

@@ -16,7 +16,9 @@ imports:
 - ./SearchAPI
 - ./METSAPI
 - ./DataServiceEndpointTypes
-- ../slots/auxiliary_platforms
+# REMOVED - migrated to has_or_had_auxiliary_entities with range AuxiliaryDigitalPlatform (Rule 53)
+# - ../slots/auxiliary_platforms
+- ../slots/has_or_had_auxiliary_entities
 - ../slots/has_or_had_powered_by_cm
 - ../slots/has_or_had_access_restriction
 - ../slots/preservation_level
@@ -103,7 +105,9 @@ classes:
     slots:
     - has_or_had_access_restriction
     - has_or_had_api_endpoint
-    - auxiliary_platforms
+    # MIGRATED from auxiliary_platforms to has_or_had_auxiliary_entities (Rule 53)
+    # - auxiliary_platforms
+    - has_or_had_auxiliary_entities
     - collection_web_address
     - has_or_had_data_service_endpoint
     - fixity_check_date
@@ -241,7 +245,11 @@ classes:
           description: Open to all users
         - value: API key required
           description: Developer registration needed
-      has_auxiliary_platform:
+      # MIGRATED from auxiliary_platforms / has_auxiliary_platform (Rule 53)
+      has_or_had_auxiliary_entities:
+        description: |
+          MIGRATED from auxiliary_platforms (Rule 53).
+          Subordinate or auxiliary digital platforms associated with this platform.
         range: AuxiliaryDigitalPlatform
         multivalued: true
         inlined_as_list: true
@@ -326,7 +334,7 @@ classes:
     - 'Multivalued on Custodian: one custodian can have multiple platforms (website + API + mobile app)'
     - Temporal validity tracks platform lifecycle (launch, shutdown, migration)
     - IIIF and linked data flags enable discovery of interoperable platforms
-    - 'NEW: auxiliary_platforms links to subordinate AuxiliaryDigitalPlatform sites (project portals, microsites, APIs)'
+    - 'MIGRATED: auxiliary_platforms → has_or_had_auxiliary_entities for AuxiliaryDigitalPlatform sites (project portals, microsites, APIs)'
     - Hierarchical pattern mirrors CustodianName → CustodianAppellation relationship
     see_also:
     - https://schema.org/WebSite

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

@@ -8,7 +8,7 @@ imports:
 - ./ReconstructionActivity
 - ../enums/EducationProviderTypeEnum
 - ../slots/has_or_had_accessibility_feature
-- ../slots/annual_participants
+# REMOVED 2026-01-15: ../slots/annual_participants - migrated to has_or_had_annual_participant_count
 # REMOVED 2026-01-15: ../slots/booking_required - migrated to is_or_was_required
 - ../slots/is_or_was_required
 - ../slots/classroom_count
@@ -79,7 +79,8 @@ classes:
     - schema:Course
     slots:
     - has_or_had_accessibility_feature
-    - annual_participants
+    # REMOVED 2026-01-15: annual_participants - migrated to has_or_had_annual_participant_count
+    - has_or_had_annual_participant_count
     # REMOVED 2026-01-15: booking_required - migrated to is_or_was_required
     - is_or_was_required
     - classroom_count
@@ -255,7 +256,7 @@ classes:
         has_or_had_accessibility_feature:
         - Wheelchair accessible
         - Hearing loop
-        annual_participants: 75000
+        has_or_had_annual_participant_count: 75000
         staff_count: 12
         is_or_was_required: true
         education_contact_email: educatie@rijksmuseum.nl

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

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

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

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

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

@@ -20,7 +20,10 @@ imports:
 - ../slots/isbn
 - ../slots/language
 - ../slots/price
-- ../slots/authors
+# REMOVED - migrated to has_or_had_author (Rule 53)
+# - ../slots/authors
+- ../slots/has_or_had_author
+- ./Author
 # REMOVED: ../slots/binding - Use has_or_had_type with BindingType instead (2026-01-15)
 - ../slots/has_or_had_type
 - ./BindingType
@@ -51,7 +54,7 @@ imports:
 - ../slots/worldcat_id
 - ./SpecificityAnnotation
 - ./TemplateSpecificityScores
-- ../slots/has_author
+# REMOVED: ../slots/has_author - migrated to has_or_had_author (Rule 53)
 default_prefix: hc
 classes:
   ExhibitionCatalog:
@@ -80,7 +83,8 @@ classes:
     - bf:Instance
     - bibo:Book
     slots:
-    - authors
+    # REMOVED: authors - migrated to has_or_had_author (Rule 53)
+    - has_or_had_author
     # REMOVED: binding - Use has_or_had_type with BindingType instead (2026-01-15)
     - has_or_had_type
     - catalog_description
@@ -146,13 +150,28 @@ classes:
         examples:
         - value: PRINT_CATALOG
         - value: DIGITAL_CATALOG
-      has_author:
+      has_or_had_author:
+        description: >-
+          Authors of the exhibition catalog.
+          MIGRATED from authors/has_author slots (Rule 53).
+          
+          Uses Author class for structured authorship data including
+          name, role (author/editor/translator), affiliation, and identifiers.
         required: false
-        range: string
+        range: Author
+        inlined: true
         multivalued: true
         examples:
-        - value: Pieter Roelofs
+        - value: |
-        - value: Gregor J.M. Weber
+            author_name: Pieter Roelofs
+            author_role: AUTHOR
+            author_affiliation: Rijksmuseum Amsterdam
+          description: Primary author with affiliation
+        - value: |
+            author_name: Gregor J.M. Weber
+            author_role: AUTHOR
+            author_identifier: https://orcid.org/0000-0002-1234-5678
+          description: Author with ORCID identifier
       editor:
         required: false
         range: string
@@ -340,9 +359,13 @@ classes:
         catalog_title: Vermeer
         catalog_for: https://nde.nl/ontology/hc/exhibition/rijksmuseum-vermeer-2023
         catalog_type: PRINT_CATALOG
-        has_author:
+        has_or_had_author:
-        - Pieter Roelofs
+        - author_name: Pieter Roelofs
-        - Gregor J.M. Weber
+          author_role: AUTHOR
+          author_affiliation: Rijksmuseum Amsterdam
+        - author_name: Gregor J.M. Weber
+          author_role: AUTHOR
+          author_affiliation: Rijksmuseum Amsterdam
         editor:
         - Pieter Roelofs
         publisher: Rijksmuseum / Hannibal Publishing

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

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

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

@@ -20,7 +20,8 @@ imports:
 - ../slots/extraction_confidence
 - ../slots/extraction_note
 - ../slots/observed_in
-- ../slots/applies_to_call
+# REMOVED 2026-01-15: ../slots/applies_to_call - migrated to applies_or_applied_to_call
+- ../slots/applies_or_applied_to_call
 - ../slots/is_mandatory
 - ../slots/requirement_id
 - ../slots/requirement_text
@@ -95,7 +96,8 @@ classes:
     - schema:eligibleQuantity
     - prov:wasDerivedFrom
     slots:
-    - applies_to_call
+    # REMOVED 2026-01-15: applies_to_call - migrated to applies_or_applied_to_call
+    - applies_or_applied_to_call
     - extraction_confidence
     - extraction_note
     - is_mandatory
@@ -240,7 +242,7 @@ classes:
         requirement_value: '3'
         requirement_unit: partners
         is_mandatory: true
-        applies_to_call: https://nde.nl/ontology/hc/call/ec/cl2-2025-heritage-01
+        applies_or_applied_to_call: https://nde.nl/ontology/hc/call/ec/cl2-2025-heritage-01
         observed_in: https://nde.nl/ontology/hc/observation/web/2025-11-29/eu-horizon-cl2-heritage
         source_section: Section 2 - Eligibility Conditions
         extraction_confidence: 0.98
@@ -254,7 +256,7 @@ classes:
         requirement_value: '30'
         requirement_unit: percent
         is_mandatory: true
-        applies_to_call: https://nde.nl/ontology/hc/call/ec/cl2-2025-heritage-01
+        applies_or_applied_to_call: https://nde.nl/ontology/hc/call/ec/cl2-2025-heritage-01
         observed_in: https://nde.nl/ontology/hc/observation/web/2025-11-29/eu-horizon-cl2-heritage
         source_section: Section 3 - Financial Conditions
         extraction_confidence: 0.95
@@ -268,7 +270,7 @@ classes:
         requirement_value: immediate
         requirement_unit: null
         is_mandatory: true
-        applies_to_call: https://nde.nl/ontology/hc/call/ec/cl2-2025-heritage-01
+        applies_or_applied_to_call: https://nde.nl/ontology/hc/call/ec/cl2-2025-heritage-01
         observed_in: https://nde.nl/ontology/hc/observation/web/2025-11-29/eu-horizon-cl2-heritage
         source_section: Section 4.2 - Open Science
         extraction_confidence: 0.99
@@ -282,7 +284,7 @@ classes:
         requirement_value: UK
         requirement_unit: country
         is_mandatory: true
-        applies_to_call: https://nde.nl/ontology/hc/call/nlhf/medium-grants-2025-q4
+        applies_or_applied_to_call: https://nde.nl/ontology/hc/call/nlhf/medium-grants-2025-q4
         observed_in: https://nde.nl/ontology/hc/observation/web/2025-11-28/nlhf-medium-grants
         source_section: Eligibility
         extraction_confidence: 0.99
@@ -296,7 +298,7 @@ classes:
         requirement_value: non-profit
         requirement_unit: organization-type
         is_mandatory: true
-        applies_to_call: https://nde.nl/ontology/hc/call/nlhf/medium-grants-2025-q4
+        applies_or_applied_to_call: https://nde.nl/ontology/hc/call/nlhf/medium-grants-2025-q4
         observed_in: https://nde.nl/ontology/hc/observation/web/2025-11-28/nlhf-medium-grants
         source_section: Who can apply
         extraction_confidence: 0.95

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

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

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

@@ -6,10 +6,12 @@ imports:
 - ./ReconstructedEntity
 - ./CustodianObservation
 - ./ReconstructionActivity
+- ./Area
 - ../enums/FeatureTypeEnum
 - ../slots/has_or_had_architect
 - ../slots/has_architectural_style
-- ../slots/building_floor_area_sqm
+# REMOVED 2026-01-15: ../slots/building_floor_area_sqm - migrated to has_or_had_area + Area (Rule 53)
+- ../slots/has_or_had_area
 - ../slots/complex_name
 - ../slots/condition_status
 - ../slots/construction_date
@@ -78,7 +80,7 @@ classes:
     slots:
     - has_or_had_architect
     - has_architectural_style
-    - building_floor_area_sqm
+    - has_or_had_area
     - complex_name
     - condition_status
     - construction_date
@@ -207,11 +209,30 @@ classes:
           description: Monastery complex
         - value: Paleis Het Loo ensemble
           description: Palace complex
-      building_floor_area_sqm:
+      has_or_had_area:
-        range: float
+        description: >-
+          Floor area of the historic building.
+          MIGRATED from building_floor_area_sqm (Rule 53).
+        range: Area
+        inlined: true
+        multivalued: true
         examples:
-        - value: 450.0
+        - value:
-          description: Building floor area
+            area_value: 450.0
+            has_or_had_unit:
+              unit_type: SQUARE_METER
+              unit_symbol: "m²"
+            has_or_had_label: "Building floor area"
+          description: 450 square meters floor area
+        - value:
+            area_value: 1200.0
+            has_or_had_unit:
+              unit_type: SQUARE_METER
+              unit_symbol: "m²"
+            is_estimate: true
+            measurement_method: "Historical records"
+            has_or_had_label: "Total floor area"
+          description: 1200 square meters (estimated from historical records)
       current_use:
         range: string
         examples:
@@ -239,6 +260,7 @@ classes:
     - Links to FeatureTypeEnum for Wikidata-sourced building classification
     - Distinguished from CustodianPlace (main headquarters)
     - May be open to public or used for operations/events
+    - "MIGRATION NOTE: has_or_had_area replaced building_floor_area_sqm (Rule 53)"
     see_also:
     - http://vocab.getty.edu/aat/300005425
     - https://schema.org/LandmarksOrHistoricalBuildings
@@ -252,12 +274,18 @@ classes:
         feature_type_classification: HISTORIC_HOUSE_MUSEUM
         construction_date: '1650'
         construction_date_precision: APPROXIMATE
-        architectural_style: Dutch Golden Age
+        has_architectural_style: Dutch Golden Age
         heritage_status: Rijksmonument
         monument_number: '16284'
         is_open_to_public: false
         current_use: Administrative offices and events
         condition_status: EXCELLENT
+        has_or_had_area:
+        - area_value: 450.0
+          has_or_had_unit:
+            unit_type: SQUARE_METER
+            unit_symbol: "m²"
+          has_or_had_label: "Total floor area"
       description: Historic canal house as secondary property
     - value:
         historic_building_id: https://nde.nl/ontology/hc/aux/kasteel-amerongen
@@ -266,14 +294,21 @@ classes:
         feature_type_classification: CASTLE
         construction_date: 13th century
         construction_date_precision: CENTURY
-        architectural_style: Dutch Classical
+        has_architectural_style: Dutch Classical
-        architect: Maurits Post
+        has_or_had_architect: Maurits Post
         heritage_status: Rijksmonument
         monument_number: '521814'
         is_open_to_public: true
-        visiting_hours: Tu-Su 11:00-17:00
+        visiting_hour: Tu-Su 11:00-17:00
         is_part_of_complex: true
         complex_name: Kasteel Amerongen landgoed
         current_use: Museum and events
         condition_status: GOOD
+        has_or_had_area:
+        - area_value: 2500.0
+          has_or_had_unit:
+            unit_type: SQUARE_METER
+            unit_symbol: "m²"
+          is_estimate: true
+          has_or_had_label: "Castle floor area"
       description: Castle as heritage property

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

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

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

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

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

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

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

@@ -0,0 +1,133 @@
+id: https://nde.nl/ontology/hc/class/measure-unit
+name: measure_unit_class
+title: MeasureUnit Class
+description: >-
+  Class representing a unit of measurement for quantities.
+  
+  **RULE 53 COMPLIANT**: Generic class for standardized unit representation,
+  used by Area, Quantity, and other measurement classes.
+  
+  **ONTOLOGY ALIGNMENT**:
+  - QUDT (Quantities, Units, Dimensions and Types)
+  - schema:unitCode / schema:unitText
+  - OM (Ontology of Units of Measure)
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  qudt: http://qudt.org/schema/qudt/
+  om: http://www.ontology-of-units-of-measure.org/resource/om-2/
+
+imports:
+  - linkml:types
+  - ../enums/MeasureUnitEnum
+  - ../slots/has_or_had_label
+
+default_prefix: hc
+
+classes:
+  MeasureUnit:
+    description: >-
+      A unit of measurement for expressing quantities.
+      
+      Captures the unit type (from MeasureUnitEnum), symbol, and optional
+      conversion factors. Used as the range for has_or_had_unit slot.
+      
+      **EXAMPLES**:
+      - Hectare (ha) for outdoor site area
+      - Square meter (m²) for building floor area
+      - Linear meter (m) for archival shelf extent
+    class_uri: qudt:Unit
+    exact_mappings:
+      - qudt:Unit
+      - om:Unit
+    close_mappings:
+      - schema:unitCode
+    slots:
+      - unit_type
+      - unit_symbol
+      - unit_code
+      - has_or_had_label
+    slot_usage:
+      unit_type:
+        description: >-
+          The type of unit from MeasureUnitEnum (e.g., HECTARE, SQUARE_METER).
+        range: MeasureUnitEnum
+        required: true
+      unit_symbol:
+        description: >-
+          The symbol for the unit (e.g., "ha", "m²", "km").
+        range: string
+        required: false
+        examples:
+          - value: "ha"
+            description: Hectare symbol
+          - value: "m²"
+            description: Square meter symbol
+          - value: "m"
+            description: Meter symbol
+      unit_code:
+        description: >-
+          Standard code for the unit (UCUM or QUDT code).
+        range: string
+        required: false
+        examples:
+          - value: "har"
+            description: UCUM code for hectare
+          - value: "m2"
+            description: UCUM code for square meter
+      has_or_had_label:
+        description: >-
+          Human-readable label for the unit.
+        range: string
+        examples:
+          - value: "hectare"
+            description: Hectare label
+          - value: "square meter"
+            description: Square meter label
+    examples:
+      - value:
+          unit_type: HECTARE
+          unit_symbol: "ha"
+          unit_code: "har"
+          has_or_had_label: "hectare"
+        description: Hectare unit for outdoor site area
+      - value:
+          unit_type: SQUARE_METER
+          unit_symbol: "m²"
+          unit_code: "m2"
+          has_or_had_label: "square meter"
+        description: Square meter unit for building floor area
+      - value:
+          unit_type: LINEAR_METER
+          unit_symbol: "m"
+          unit_code: "m"
+          has_or_had_label: "linear meter"
+        description: Linear meter for archival shelf extent
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: >-
+        Measurement units applicable to all heritage custodian types.
+      specificity_score: 0.3
+      specificity_rationale: >-
+        Foundational class - highly reusable across many contexts.
+
+slots:
+  unit_type:
+    description: >-
+      The enumerated type of measurement unit.
+    range: MeasureUnitEnum
+    slot_uri: qudt:unit
+
+  unit_symbol:
+    description: >-
+      The symbol representing the unit (e.g., "ha", "m²").
+    range: string
+    slot_uri: qudt:symbol
+
+  unit_code:
+    description: >-
+      Standard code for the unit from UCUM or QUDT vocabularies.
+    range: string
+    slot_uri: qudt:ucumCode

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

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

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

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

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

@@ -16,7 +16,8 @@ imports:
 - ./CustodianType
 - ../slots/geographic_scope
 - ../enums/NonProfitCustodianTypeEnum
-- ../slots/beneficiary_group
+# REMOVED 2026-01-15: ../slots/beneficiary_group - migrated to has_or_had_beneficiary
+- ../slots/has_or_had_beneficiary
 - ../slots/has_or_had_custodian_type
 - ../slots/impact_measurement
 - ../slots/nonprofit_subtype
@@ -193,7 +194,7 @@ classes:
       \  a schema:NGO, foaf:Organization, crm:E74_Group, hc:NonProfitOrganization ;\n  hc:custodian_type hc:NonProfitType\
       \ ;\n  hc:organizational_mission \"Heritage advocacy, Awareness campaigns, Policy influence\" ;\n  hc:program_activities\
       \ \"7 Most Endangered Programme\", \"European Heritage Awards\", \"Advocacy campaigns\" ;\n  hc:geographic_scope \"\
-      Pan-European\", \"50+ countries\", \"300+ member organizations\" ;\n  hc:beneficiary_groups \"Heritage organizations\"\
+      Pan-European\", \"50+ countries\", \"300+ member organizations\" ;\n  hc:has_or_had_beneficiary \"Heritage organizations\"\
       , \"Local communities\", \"Policy makers\", \"General public\" ;\n  hc:partnership_model \"Membership network\", \"\
       Co-funded programs\", \"Coalition building\" ;\n  hc:impact_measurement \"Sites saved from demolition\", \"Policy changes\
       \ achieved\", \"Public awareness metrics\" ;\n  schema:name \"Europa Nostra\" ;\n  schema:foundingDate \"1963\" ;\n\
@@ -212,7 +213,7 @@ classes:
     - schema:EducationalOrganization
     - schema:FundingAgency
     slots:
-    - beneficiary_group
+    - has_or_had_beneficiary
     - has_or_had_custodian_type
     - geographic_scope
     - impact_measurement
@@ -253,7 +254,7 @@ classes:
           description: International NGO scope
         - value: National (Netherlands), 500 members
           description: National NGO scope
-      beneficiary_group:
+      has_or_had_beneficiary:
         range: string
         multivalued: true
         required: true

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

@@ -13,7 +13,8 @@ imports:
 - ./BranchType
 - ../slots/located_at
 - ../slots/has_or_had_description
-- ../slots/branch_head
+- ../slots/has_or_had_head
+# REMOVED: ../slots/branch_head - MIGRATED to has_or_had_head (2026-01-14) per Rule 53
 - ../slots/has_or_had_identifier
 - ../slots/has_or_had_label
 - ../slots/has_or_had_type
@@ -85,7 +86,8 @@ classes:
     - schema:department
     slots:
     - has_or_had_description
-    - branch_head
+    - has_or_had_head
+    # REMOVED: branch_head - MIGRATED to has_or_had_head (2026-01-14) per Rule 53
     - has_or_had_identifier
     - has_or_had_label
     - has_or_had_type
@@ -206,11 +208,21 @@ classes:
         - value:
             has_or_had_label: Schiphol Terminal 2 Kiosk
           description: Sub-branch of Schiphol exhibition
-      branch_head:
+      has_or_had_head:
-        range: string
+        range: Person
+        description: >-
+          Person who heads or headed this organizational branch.
+          MIGRATED from branch_head (2026-01-14) per Rule 53.
+          
+          Uses W3C ORG pattern - inverse of org:headOf.
+          Can reference Person entity or be inline PersonObservation.
         examples:
-        - value: Dr. Maria van der Berg
+        - value: https://nde.nl/ontology/hc/person/dr-maria-van-der-berg
-          description: Branch director name
+          description: Branch director reference
+        - value:
+            full_name: Dr. Maria van der Berg
+            role: Branch Director
+          description: Inline person observation
       staff_count:
         range: integer
         examples:

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

@@ -6,6 +6,7 @@ imports:
 - ./ReconstructedEntity
 - ./CustodianObservation
 - ./ReconstructionActivity
+- ./Area
 - ../enums/BioCustodianTypeEnum
 - ../enums/FeatureTypeEnum
 - ../enums/OutdoorSiteTypeEnum
@@ -15,7 +16,9 @@ imports:
 - ../slots/outdoor_site_type
 - ../slots/bio_type_classification
 - ../slots/feature_type_classification
-- ../slots/area_hectares
+# REMOVED 2026-01-15: ../slots/area_hectares - migrated to has_or_had_area + Area (Rule 53)
+# REMOVED 2026-01-15: ../slots/has_area_in_hectare - BESPOKE SLOT INCORRECTLY CREATED, replaced with has_or_had_area + Area (Rule 53)
+- ../slots/has_or_had_area
 - ../slots/has_or_had_artwork_count
 - ../slots/plant_species_count
 - ../slots/has_or_had_animal_species_count
@@ -63,8 +66,8 @@ classes:
       \ ruins\n4. **Botanical Collections**: Arboreta, plant collections\n5. **Nature Reserves**: Managed natural areas\n\
       6. **Castle/Estate Grounds**: Historic landscape parks\n7. **Cemeteries**: Historic burial grounds\n\n**USE CASES**:\n\
       \n1. **Museum Sculpture Garden**:\n   ```yaml\n   OutdoorSite:\n     outdoor_site_id: \"https://nde.nl/ontology/hc/aux/kroller-muller-sculpture\"\
-      \n     outdoor_site_name: \"Kröller-Müller Beeldentuin\"\n     feature_type_classification: SCULPTURE_GARDEN\n     area_hectares:\
+      \n     outdoor_site_name: \"Kröller-Müller Beeldentuin\"\n     feature_type_classification: SCULPTURE_GARDEN\n     has_or_had_area:\
-      \ 25\n     artwork_count: 160\n   ```\n\n2. **Historic Estate Grounds**:\n   ```yaml\n   OutdoorSite:\n     outdoor_site_name:\
+      \n       - area_value: 25.0\n         has_or_had_unit:\n           unit_type: HECTARE\n           unit_symbol: \"ha\"\n     has_or_had_artwork_count: 160\n   ```\n\n2. **Historic Estate Grounds**:\n   ```yaml\n   OutdoorSite:\n     outdoor_site_name:\
       \ \"Paleis Het Loo Tuinen\"\n     bio_type_classification: GARDEN\n     feature_type_classification: FORMAL_GARDEN\n\
       \     historic_garden_designation: true\n   ```\n\n3. **Archaeological Site**:\n   ```yaml\n   OutdoorSite:\n     outdoor_site_name:\
       \ \"Archeologisch Park Matilo\"\n     feature_type_classification: ARCHAEOLOGICAL_SITE\n     period_covered: \"Roman\
@@ -83,7 +86,7 @@ classes:
     - has_or_had_accessibility_feature
     - has_or_had_admission_fee
     - has_or_had_animal_species_count
-    - area_hectares
+    - has_or_had_area
     - has_or_had_artwork_count
     - bio_type_classification
     - conservation_status
@@ -150,11 +153,29 @@ classes:
           description: Sculpture garden
         - value: ARCHAEOLOGICAL_SITE
           description: Archaeological site
-      has_area_in_hectare:
+      has_or_had_area:
-        range: float
+        description: >-
+          Area of the outdoor site.
+          MIGRATED from area_hectares and has_area_in_hectare (Rule 53).
+        range: Area
+        inlined: true
+        multivalued: true
         examples:
-        - value: 25.0
+        - value:
-          description: 25 hectares
+            area_value: 25.0
+            has_or_had_unit:
+              unit_type: HECTARE
+              unit_symbol: "ha"
+            has_or_had_label: "Sculpture garden area"
+          description: 25 hectares sculpture garden
+        - value:
+            area_value: 650.0
+            has_or_had_unit:
+              unit_type: HECTARE
+              unit_symbol: "ha"
+            is_estimate: true
+            has_or_had_label: "Estate grounds"
+          description: 650 hectares historic estate (estimated)
       has_or_had_artwork_count:
         range: integer
         examples:
@@ -228,6 +249,7 @@ classes:
     - Links to BOTH BioCustodianTypeEnum AND FeatureTypeEnum
     - BioCustodianTypeEnum for botanical/zoo classifications
     - FeatureTypeEnum for landscape/archaeological features
+    - "MIGRATION NOTE: has_or_had_area replaced area_hectares and has_area_in_hectare (Rule 53)"
     see_also:
     - https://schema.org/Park
     - https://www.wikidata.org/wiki/Q22698
@@ -240,11 +262,16 @@ classes:
           National Park.
         outdoor_site_type: SCULPTURE_GARDEN
         feature_type_classification: SCULPTURE_GARDEN
-        area_hectares: 25.0
+        has_or_had_area:
-        artwork_count: 160
+        - area_value: 25.0
+          has_or_had_unit:
+            unit_type: HECTARE
+            unit_symbol: "ha"
+          has_or_had_label: "Total site area"
+        has_or_had_artwork_count: 160
         is_open_to_public: true
-        admission_fee: Included with museum ticket
+        has_or_had_admission_fee: Included with museum ticket
-        opening_hours: Tu-Su 10:00-17:00
+        opening_hour: Tu-Su 10:00-17:00
         has_or_had_accessibility_feature:
         - Paved paths
         - Wheelchair routes available
@@ -255,10 +282,16 @@ classes:
         outdoor_site_description: Formal baroque gardens restored to 17th-century design. Part of royal palace complex.
         outdoor_site_type: FORMAL_GARDEN
         bio_type_classification: GARDEN
-        area_hectares: 650.0
+        has_or_had_area:
+        - area_value: 650.0
+          has_or_had_unit:
+            unit_type: HECTARE
+            unit_symbol: "ha"
+          is_estimate: true
+          has_or_had_label: "Estate grounds"
         is_open_to_public: true
-        admission_fee: Included with palace ticket
+        has_or_had_admission_fee: Included with palace ticket
-        seasonal_hours: Summer 10:00-18:00; Winter 10:00-16:00
+        seasonal_hour: Summer 10:00-18:00; Winter 10:00-16:00
         historic_garden_designation: true
       description: Historic palace gardens
     - value:
@@ -267,8 +300,13 @@ classes:
         outdoor_site_description: Archaeological park on site of Roman fort Matilo with reconstructed structures.
         outdoor_site_type: ARCHAEOLOGICAL_SITE
         feature_type_classification: ARCHAEOLOGICAL_SITE
-        area_hectares: 3.5
+        has_or_had_area:
+        - area_value: 3.5
+          has_or_had_unit:
+            unit_type: HECTARE
+            unit_symbol: "ha"
+          has_or_had_label: "Archaeological park area"
         is_open_to_public: true
-        admission_fee: Free
+        has_or_had_admission_fee: Free
         period_covered: Roman period (50-400 CE)
       description: Roman archaeological park

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

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

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

@@ -17,8 +17,14 @@ imports:
 - ../slots/id
 - ../slots/person_name
 - ../slots/has_person_name
-- ../slots/birth_date
+# REMOVED - migrated to has_or_had_date_of_birth (Rule 53)
-- ../slots/birth_place
+# - ../slots/birth_date
+- ../slots/has_or_had_date_of_birth
+- ./BirthDate
+# REMOVED - migrated to has_or_had_place_of_birth (Rule 53)
+# - ../slots/birth_place
+- ../slots/has_or_had_place_of_birth
+- ./BirthPlace
 - ../slots/death_place
 - ../slots/date_of_death
 - ../slots/deceased
@@ -99,8 +105,10 @@ classes:
     slots:
     - is_or_was_affected_by_event
     - has_age
-    - birth_date
+    # REMOVED: birth_date - migrated to has_or_had_date_of_birth (Rule 53)
-    - birth_place
+    - has_or_had_date_of_birth
+    # REMOVED: birth_place - migrated to has_or_had_place_of_birth (Rule 53)
+    - has_or_had_place_of_birth
     - contact_email
     - created
     - date_of_death
@@ -148,12 +156,48 @@ classes:
         - Required is false initially to allow PersonObservation without hub linkage
         - Production data SHOULD always have this link for full PICO compliance
         - 'Inverse relationship: Person.has_person_observation (implemented v0.9.8)'
-      birth_date:
+      has_or_had_date_of_birth:
-        range: string
+        description: >-
+          Birth date of the person using structured BirthDate class.
+          MIGRATED from birth_date slot (Rule 53).
+          
+          Supports EDTF notation for uncertain/incomplete dates and
+          tracks provenance for inferred dates per Rule 45.
+        range: BirthDate
+        inlined: true
         required: false
-      birth_place:
+        examples:
-        range: string
+          - value: |
+              birth_edtf: "1970-08-15"
+              is_inferred: false
+              confidence: HIGH
+            description: Full date known
+          - value: |
+              birth_edtf: "197X"
+              is_inferred: true
+              confidence: LOW
+            description: Decade inferred from career start
+      has_or_had_place_of_birth:
+        description: >-
+          Birth place of the person using structured BirthPlace class.
+          MIGRATED from birth_place slot (Rule 53).
+          
+          Supports historical vs. modern place names and links to
+          GeoNames/Wikidata for geographic resolution.
+        range: BirthPlace
+        inlined: true
         required: false
+        examples:
+          - value: |
+              place_name: Amsterdam
+              country_code: NL
+              geonames_id: 2759794
+            description: Birth place with geographic identifiers
+          - value: |
+              place_name: Batavia
+              modern_place_name: Jakarta
+              country_code: ID
+            description: Historical place name
       death_place:
         range: string
         required: false

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

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

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

@@ -10,7 +10,10 @@ imports:
 - ../slots/confidence_score
 - ../slots/superseded_by
 - ../slots/is_or_was_about_digital_presence
-- ../slots/asserted_by
+# REMOVED - migrated to is_or_was_asserted_by (Rule 53)
+# - ../slots/asserted_by
+- ../slots/is_or_was_asserted_by
+- ./Asserter
 - ../slots/has_assertion_date
 - ../slots/has_or_had_identifier
 - ../slots/has_assertion_rationale
@@ -91,7 +94,9 @@ classes:
     - prov:wasGeneratedBy
     slots:
     - is_or_was_about_digital_presence
-    - asserted_by
+    # REMOVED - migrated to is_or_was_asserted_by (Rule 53)
+    # - asserted_by
+    - is_or_was_asserted_by
     - has_assertion_date
     - has_or_had_identifier
     - has_assertion_rationale
@@ -165,6 +170,27 @@ classes:
         required: false
         examples:
         - value: '2025-11-29T14:30:00Z'
+      is_or_was_asserted_by:
+        range: Asserter
+        inlined: true
+        required: false
+        description: >-
+          The agent responsible for making this assertion.
+          MIGRATED from asserted_by (Rule 53) - changed from string to Asserter
+          class for richer provenance tracking.
+        examples:
+        - value:
+            has_or_had_identifier: https://nde.nl/ontology/hc/asserter/primary-presence-analyzer
+            has_or_had_label: primary-presence-analyzer
+            asserter_type: AUTOMATED_SYSTEM
+            asserter_version: "1.0"
+          description: Automated system asserter
+        - value:
+            has_or_had_identifier: https://nde.nl/ontology/hc/asserter/jane-doe
+            has_or_had_label: Jane Doe
+            asserter_type: HUMAN_ANALYST
+            asserter_contact: jane.doe@heritage-org.nl
+          description: Human analyst asserter
       was_asserted_by:
         range: string
         required: false

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

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

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

@@ -0,0 +1,332 @@
+id: https://nde.nl/ontology/hc/class/Quantity
+name: Quantity
+title: Quantity Class
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  qudt: http://qudt.org/schema/qudt/
+  schema: http://schema.org/
+  dcterms: http://purl.org/dc/terms/
+imports:
+- linkml:types
+- ../enums/QuantityTypeEnum
+- ../slots/has_or_had_identifier
+- ../slots/has_or_had_label
+- ../slots/has_or_had_description
+- ../slots/has_or_had_measurement_unit
+- ../slots/has_or_had_methodology
+- ../slots/temporal_extent
+- ../slots/specificity_annotation
+- ../slots/template_specificity
+- ./MeasureUnit
+- ./Methodology
+- ./TimeSpan
+- ./SpecificityAnnotation
+- ./TemplateSpecificityScores
+default_prefix: hc
+classes:
+  Quantity:
+    class_uri: qudt:Quantity
+    description: >-
+      A quantified value with an optional unit of measurement and type.
+      
+      **QUDT ALIGNMENT**:
+      
+      Maps to `qudt:Quantity` - "A quantitative value expressed as a
+      number and a unit of measurement."
+      
+      **TYPES OF QUANTITIES**:
+      
+      | Type | Description | Example |
+      |------|-------------|---------|
+      | STAFF_COUNT | Number of employees | 42 employees |
+      | COLLECTION_SIZE | Number of items | 1.2 million objects |
+      | VISITOR_COUNT | Annual visitors | 2.5 million/year |
+      | BUDGET_AMOUNT | Financial value | €15 million |
+      | AREA | Physical space | 10,000 m² |
+      | DURATION | Time period | 6 months |
+      
+      **USE CASES**:
+      
+      1. **Staff Metrics**: Branch staff count, department size, FTE equivalents
+      2. **Collection Metrics**: Object counts, archive linear meters, digital items
+      3. **Visitor Metrics**: Annual attendance, daily capacity, peak visitors
+      4. **Financial Metrics**: Budget, revenue, acquisition costs
+      5. **Physical Metrics**: Floor area, gallery space, storage capacity
+      
+      **WHY NOT JUST USE INTEGER?**
+      
+      Simple integer fields like `branch_staff_count: 3` lose important context:
+      - What's the unit? (FTE? headcount? contractors included?)
+      - When was this measured? (provenance)
+      - Is this exact or estimated?
+      - What type of quantity is this?
+      
+      The Quantity class captures this richness while remaining simple for basic use.
+      
+      **EXAMPLE**:
+      
+      ```yaml
+      Quantity:
+        quantity_id: https://nde.nl/ontology/hc/quantity/nha-zaanstreek-staff-2025
+        quantity_value: 3
+        quantity_type: STAFF_COUNT
+        has_or_had_measurement_unit:
+          unit_type: VISITOR
+          unit_symbol: "visitors"
+        temporal_extent:
+          begin_of_the_begin: "2024-01-01T00:00:00Z"
+          end_of_the_end: "2024-12-31T23:59:59Z"
+        has_or_had_description: Staff assigned to Zaanstreek-Waterland branch
+      ```
+      
+      **RULE 53 COMPLIANT**: Updated with link_branch slots (has_or_had_measurement_unit,
+      temporal_extent, has_or_had_methodology) per slot_fixes.yaml revision for 
+      visitor_count, view_count, unique_object_count, and unique_face_count migrations.
+    exact_mappings:
+      - qudt:Quantity
+    close_mappings:
+      - schema:QuantitativeValue
+    related_mappings:
+      - schema:numberOfEmployees
+      - schema:floorSize
+      - dcterms:extent
+    slots:
+      - has_or_had_identifier
+      - quantity_value
+      - quantity_type
+      - quantity_unit
+      - has_or_had_measurement_unit
+      - has_or_had_methodology
+      - temporal_extent
+      - has_or_had_description
+      - quantity_date
+      - is_estimate
+      - specificity_annotation
+      - template_specificity
+    slot_usage:
+      has_or_had_identifier:
+        range: uriorcurie
+        required: false
+        identifier: true
+        description: >-
+          Optional identifier for this quantity measurement.
+        examples:
+          - value: https://nde.nl/ontology/hc/quantity/nha-zaanstreek-staff-2025
+            description: Branch staff count measurement
+      quantity_value:
+        range: float
+        required: true
+        description: >-
+          The numeric value of the quantity.
+        examples:
+          - value: 3
+            description: 3 staff members
+          - value: 1200000
+            description: 1.2 million collection items
+          - value: 2500000
+            description: 2.5 million annual visitors
+      quantity_type:
+        range: QuantityTypeEnum
+        required: false
+        description: >-
+          The type of quantity being measured.
+        examples:
+          - value: STAFF_COUNT
+          - value: COLLECTION_SIZE
+          - value: VISITOR_COUNT
+      quantity_unit:
+        range: string
+        required: false
+        deprecated: >-
+          Use has_or_had_measurement_unit with MeasureUnit class instead.
+          Retained for backward compatibility with existing data.
+        description: >-
+          DEPRECATED: The unit of measurement as a simple string.
+          Prefer has_or_had_measurement_unit for structured unit data.
+        examples:
+          - value: FTE
+            description: Full-time equivalent employees
+          - value: headcount
+            description: Total number of people
+          - value: items
+            description: Collection item count
+          - value: linear meters
+            description: Archive extent
+          - value: EUR
+            description: Budget in euros
+          - value: m²
+            description: Floor area
+      has_or_had_measurement_unit:
+        range: MeasureUnit
+        required: false
+        inlined: true
+        description: >-
+          The structured unit of measurement for this quantity.
+          Provides richer semantics than the deprecated quantity_unit string.
+          RULE 53: Branch 1 slot from visitor_count migration.
+        examples:
+          - value:
+              unit_type: VISITOR
+              unit_symbol: "visitors"
+            description: Visitor count unit
+          - value:
+              unit_type: SQUARE_METER
+              unit_symbol: "m²"
+            description: Area unit
+      temporal_extent:
+        range: TimeSpan
+        required: false
+        inlined: true
+        description: >-
+          The time period over which this quantity was measured.
+          CIDOC-CRM temporal modeling with fuzzy boundaries.
+          RULE 53: Branch 2 slot from visitor_count migration.
+        examples:
+          - value:
+              begin_of_the_begin: "2024-01-01T00:00:00Z"
+              end_of_the_end: "2024-12-31T23:59:59Z"
+            description: Annual measurement period
+      has_or_had_methodology:
+        range: Methodology
+        required: false
+        inlined: true
+        description: >-
+          The methodology used to derive this quantity.
+          Essential for unique counts derived via entity resolution.
+          RULE 53: Branch 2 slot from unique_object_count/unique_face_count migration.
+        examples:
+          - value:
+              methodology_type: ENTITY_RESOLUTION
+              has_or_had_label: "ArcFace clustering"
+              confidence_threshold: 0.6
+            description: Face entity resolution methodology
+          - value:
+              methodology_type: OBJECT_TRACKING
+              has_or_had_label: "DeepSORT"
+            description: Multi-object tracking methodology
+      has_or_had_description:
+        range: string
+        required: false
+        description: >-
+          Description of what this quantity represents.
+        examples:
+          - value: Staff assigned to Zaanstreek-Waterland branch
+          - value: Annual visitor count for 2024
+      quantity_date:
+        range: date
+        required: false
+        description: >-
+          Date when this quantity was measured or is valid.
+        examples:
+          - value: '2025-01-01'
+      is_estimate:
+        range: boolean
+        required: false
+        ifabsent: 'false'
+        description: >-
+          Whether this quantity is an estimate rather than an exact count.
+        examples:
+          - value: false
+            description: Exact count
+          - value: true
+            description: Estimated value
+    comments:
+      - Quantity models quantified values with units and provenance
+      - Replaces simple integer fields with richer structured data
+      - Uses QUDT Quantity as primary ontology mapping
+      - Supports various quantity types (staff, collection, visitor, budget)
+    see_also:
+      - http://qudt.org/schema/qudt/Quantity
+      - https://schema.org/QuantitativeValue
+    examples:
+      - value:
+          has_or_had_identifier: https://nde.nl/ontology/hc/quantity/nha-zaanstreek-staff-2025
+          quantity_value: 3
+          quantity_type: STAFF_COUNT
+          has_or_had_measurement_unit:
+            unit_type: FTE
+            unit_symbol: "FTE"
+            has_or_had_label: "full-time equivalent"
+          has_or_had_description: Staff assigned to Zaanstreek-Waterland branch
+          quantity_date: '2025-01-01'
+          is_estimate: false
+        description: Branch staff count (preferred pattern with structured unit)
+      - value:
+          quantity_value: 650000
+          quantity_type: VISITOR_COUNT
+          has_or_had_measurement_unit:
+            unit_type: VISITOR
+            unit_symbol: "visitors"
+          temporal_extent:
+            begin_of_the_begin: "2023-02-10T00:00:00Z"
+            end_of_the_end: "2023-06-04T23:59:59Z"
+          has_or_had_description: Vermeer exhibition attendance
+          is_estimate: false
+        description: Exhibition visitor count with temporal extent (Rule 53 pattern)
+      - value:
+          quantity_value: 15
+          quantity_type: OBJECT_COUNT
+          has_or_had_measurement_unit:
+            unit_type: FACE
+            unit_symbol: "faces"
+          has_or_had_methodology:
+            methodology_type: ENTITY_RESOLUTION
+            has_or_had_label: "ArcFace clustering"
+            confidence_threshold: 0.6
+          has_or_had_description: Unique faces detected via entity resolution
+          is_estimate: false
+        description: Unique face count with methodology (Rule 53 pattern for unique_face_count)
+      - value:
+          quantity_value: 47
+          quantity_type: OBJECT_COUNT
+          has_or_had_measurement_unit:
+            unit_type: OBJECT
+            unit_symbol: "objects"
+          has_or_had_methodology:
+            methodology_type: OBJECT_TRACKING
+            has_or_had_label: "DeepSORT"
+          has_or_had_description: Unique objects tracked across video frames
+          is_estimate: false
+        description: Unique object count with methodology (Rule 53 pattern for unique_object_count)
+      - value:
+          quantity_value: 1200000
+          quantity_type: COLLECTION_SIZE
+          quantity_unit: items
+          has_or_had_description: Total collection size including artworks, documents, and photographs
+          is_estimate: true
+        description: Estimated collection size (deprecated string unit - backward compatible)
+      - value:
+          quantity_value: 2500000
+          quantity_type: VISITOR_COUNT
+          quantity_unit: visitors/year
+          has_or_had_description: Annual visitor count for 2024
+          quantity_date: '2024-12-31'
+          is_estimate: false
+        description: Annual visitor count (deprecated string unit - backward compatible)
+slots:
+  quantity_value:
+    description: >-
+      The numeric value of the quantity.
+    range: float
+    slot_uri: qudt:numericValue
+  quantity_type:
+    description: >-
+      The type of quantity being measured.
+    range: QuantityTypeEnum
+    slot_uri: hc:quantityType
+  quantity_unit:
+    description: >-
+      The unit of measurement (if applicable).
+    range: string
+    slot_uri: qudt:unit
+  quantity_date:
+    description: >-
+      Date when this quantity was measured or is valid.
+    range: date
+    slot_uri: dcterms:date
+  is_estimate:
+    description: >-
+      Whether this quantity is an estimate rather than an exact count.
+    range: boolean
+    slot_uri: hc:isEstimate

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

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

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

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

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

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

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

@@ -237,11 +237,20 @@ classes:
         - value: '2020-01-01'
       policy_effective_to:
         range: date
-      policy_approved_by:
+      is_or_was_approved_by:
-        range: string
+        description: >-
+          Agent (person/organization) that approved this policy.
+          MIGRATED from policy_approved_by (2026-01-15) per Rule 39.
+          Range changed from string to Approver class for structured approval tracking.
+        range: Approver
+        required: false
         examples:
-        - value: Collections Committee
+        - value:
-        - value: Director of Collections
+            approver_name: Collections Committee
+          description: Committee approval
+        - value:
+            approver_name: Director of Collections
+          description: Individual approval
       policy_review_date:
         range: date
         examples:
@@ -284,7 +293,8 @@ classes:
         - EN_15757_2010
         - EN_16893_2018
         policy_effective_from: '2020-01-01'
-        policy_approved_by: Collections Committee
+        is_or_was_approved_by:
+          approver_name: Collections Committee
         policy_review_date: '2025-12-31'
       description: Museum art storage climate policy
     - value:
@@ -313,6 +323,7 @@ classes:
         - IMAGE_PERMANENCE_INSTITUTE
         - ISO_TR_19815_2018
         policy_effective_from: '2015-06-01'
-        policy_approved_by: General Rijksarchivaris
+        is_or_was_approved_by:
+          approver_name: General Rijksarchivaris
         policy_review_date: '2025-06-01'
       description: Archive cold storage policy for photographic materials

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

@@ -195,12 +195,11 @@ classes:
         unit_name: Archive Box 145 - WWII Ministry Records
         unit_type: ARCHIVE_BOX
         unit_description: 'Acid-free archive box containing Ministry of Defense
-
+          correspondence from 1940-1945. Handle with care.'
-          correspondence from 1940-1945. Handle with care.
-
-          '
         row_number: '12'
-        bay_number: '3'
+        has_or_had_identifier:
+          - value: '3'
+            _type: BayNumber
         shelf_number: 4
         part_of_zone: https://nde.nl/ontology/hc/zone/na-depot-a-standard
         valid_from: '2020-03-15'
@@ -211,10 +210,7 @@ classes:
         unit_name: Flat File Drawer 42 - Netherlands Maps
         unit_type: FLAT_FILE_DRAWER
         unit_description: 'Flat file drawer containing oversized maps of the
-
+          Netherlands, 1850-1920. Climate-controlled environment.'
-          Netherlands, 1850-1920. Climate-controlled environment.
-
-          '
         drawer_number: 42
         capacity_items: 50
         current_item_count: 38

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

@@ -7,7 +7,7 @@ imports:
 - ./SocialMediaPostTypes
 - ../slots/language
 - ../slots/has_aspect_ratio
-- ../slots/available_caption_languages
+# REMOVED 2026-01-15: ../slots/available_caption_languages - migrated to has_available_caption_language
 - ../slots/caption_available
 - ../slots/comment_author
 - ../slots/comment_author_channel_id
@@ -36,7 +36,9 @@ imports:
 - ../slots/template_specificity
 - ../slots/video_category_id
 - ../slots/video_comment
-- ../slots/view_count
+- ../slots/has_or_had_quantity
+- ./Quantity
+# MIGRATED 2026-01-15: ../slots/view_count → ../slots/has_or_had_quantity per Rule 53
 - ./SpecificityAnnotation
 - ./TemplateSpecificityScores
 - ../slots/definition
@@ -103,7 +105,7 @@ classes:
 
       | caption | - | schema:caption |
 
-      | view_count | - | schema:interactionStatistic |
+      | view_count | - | schema:interactionStatistic (via Quantity) |
 
 
       **PLATFORM SUPPORT**:
@@ -193,7 +195,7 @@ classes:
     - wikidata:Q604644
     slots:
     - has_aspect_ratio
-    - available_caption_languages
+    - has_available_caption_language
     - caption_available
     - comment_count
     - comments_fetched
@@ -214,7 +216,7 @@ classes:
     - template_specificity
     - video_category_id
     - video_comment
-    - view_count
+    - has_or_had_quantity
     slot_usage:
       duration:
         range: string
@@ -275,12 +277,19 @@ classes:
           - en
           - de
           description: Captions available in Dutch, English, German
-      view_count:
+      has_or_had_quantity:
-        range: integer
+        range: Quantity
-        required: false
+        inlined: true
-        minimum_value: 0
+        description: >-
+          View count for video. RULE 53: Replaces deprecated view_count with
+          structured Quantity class supporting measurement unit (VIEW) and
+          temporal extent for point-in-time observation.
         examples:
-        - value: 132
+        - value:
+            numeric_value: 132
+            has_or_had_measurement_unit: VIEW
+            temporal_extent:
+              begin_of_the_begin: "2025-12-01T23:16:22Z"
           description: 132 views at observation time
       like_count:
         range: integer

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

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

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

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

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

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

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

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

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

@@ -0,0 +1,31 @@
+id: https://nde.nl/ontology/hc/enum/AsserterTypeEnum
+name: AsserterTypeEnum
+title: Asserter Type Enum
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  prov: http://www.w3.org/ns/prov#
+  foaf: http://xmlns.com/foaf/0.1/
+imports:
+- linkml:types
+default_prefix: hc
+enums:
+  AsserterTypeEnum:
+    description: >-
+      Type of agent making an assertion.
+    enum_uri: hc:AsserterTypeEnum
+    permissible_values:
+      HUMAN_ANALYST:
+        description: Human expert or analyst making a judgment.
+        meaning: foaf:Person
+      AUTOMATED_SYSTEM:
+        description: Software system or script performing automated analysis.
+        meaning: prov:SoftwareAgent
+      AI_AGENT:
+        description: AI/ML model or agent making an assertion.
+        meaning: prov:SoftwareAgent
+      ORGANIZATION:
+        description: Organization or institution making a formal assertion.
+        meaning: foaf:Organization
+      UNKNOWN:
+        description: Asserter type is not specified or cannot be determined.

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

@@ -0,0 +1,169 @@
+id: https://nde.nl/ontology/hc/enum/MeasureUnitEnum
+name: measure_unit_enum
+title: Measure Unit Enum
+description: >-
+  Enumeration of measurement units for area, length, and related quantities.
+  
+  **RULE 53 COMPLIANT**: Supports the MeasureUnit class for standardized
+  unit representation in Area and other measurement classes.
+  
+  **STANDARDS ALIGNMENT**:
+  - ISO 80000-1 (Quantities and units)
+  - QUDT (Quantities, Units, Dimensions and Types)
+  - UCUM (Unified Code for Units of Measure)
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  qudt: http://qudt.org/vocab/unit/
+  ucum: http://unitsofmeasure.org/ucum/
+
+imports:
+  - linkml:types
+
+default_prefix: hc
+
+enums:
+  MeasureUnitEnum:
+    description: >-
+      Standard measurement units for heritage custodian facility metrics.
+      
+      Covers area (m², hectares, acres), length (m, km, linear meters),
+      and related quantities for buildings, sites, and collections.
+    permissible_values:
+      # Area units
+      SQUARE_METER:
+        description: Square meter (m²) - SI unit for area
+        meaning: qudt:M2
+        annotations:
+          ucum_code: m2
+          unit_type: area
+          conversion_to_m2: 1.0
+      SQUARE_KILOMETER:
+        description: Square kilometer (km²)
+        meaning: qudt:KiloM2
+        annotations:
+          ucum_code: km2
+          unit_type: area
+          conversion_to_m2: 1000000.0
+      HECTARE:
+        description: Hectare (ha) - 10,000 m²
+        meaning: qudt:HA
+        annotations:
+          ucum_code: har
+          unit_type: area
+          conversion_to_m2: 10000.0
+      ACRE:
+        description: Acre - 4,046.86 m² (imperial)
+        meaning: qudt:AC
+        annotations:
+          ucum_code: "[acr_us]"
+          unit_type: area
+          conversion_to_m2: 4046.8564224
+      SQUARE_FOOT:
+        description: Square foot (ft²) - imperial area unit
+        meaning: qudt:FT2
+        annotations:
+          ucum_code: "[sft_i]"
+          unit_type: area
+          conversion_to_m2: 0.09290304
+
+      # Length units
+      METER:
+        description: Meter (m) - SI unit for length
+        meaning: qudt:M
+        annotations:
+          ucum_code: m
+          unit_type: length
+      KILOMETER:
+        description: Kilometer (km)
+        meaning: qudt:KiloM
+        annotations:
+          ucum_code: km
+          unit_type: length
+      LINEAR_METER:
+        description: Linear meter - for archival shelf measurement
+        meaning: qudt:M
+        annotations:
+          ucum_code: m
+          unit_type: length
+          usage_context: archival_shelving
+      FOOT:
+        description: Foot (ft) - imperial length unit
+        meaning: qudt:FT
+        annotations:
+          ucum_code: "[ft_i]"
+          unit_type: length
+
+      # Special units for heritage context
+      RUNNING_METER:
+        description: Running meter - linear extent of collection material
+        meaning: qudt:M
+        annotations:
+          ucum_code: m
+          unit_type: length
+          usage_context: collection_extent
+      SHELF_METER:
+        description: Shelf meter - archival/library shelving measurement
+        meaning: qudt:M
+        annotations:
+          ucum_code: m
+          unit_type: length
+          usage_context: storage_capacity
+
+      # Count units (Rule 53: link_branch migration for visitor_count, view_count)
+      VISITOR:
+        description: Visitor count unit - for attendance metrics
+        meaning: hc:VisitorUnit
+        annotations:
+          ucum_code: "1"
+          unit_type: count
+          usage_context: visitor_metrics
+      VIEW:
+        description: View count unit - for digital content metrics (videos, pages)
+        meaning: hc:ViewUnit
+        annotations:
+          ucum_code: "1"
+          unit_type: count
+          usage_context: digital_metrics
+      ITEM:
+        description: Item count unit - for collection object counts
+        meaning: hc:ItemUnit
+        annotations:
+          ucum_code: "1"
+          unit_type: count
+          usage_context: collection_metrics
+      FTE:
+        description: Full-time equivalent - for staff measurement
+        meaning: hc:FTEUnit
+        annotations:
+          ucum_code: "1"
+          unit_type: count
+          usage_context: staff_metrics
+      HEADCOUNT:
+        description: Headcount - total number of individuals
+        meaning: hc:HeadcountUnit
+        annotations:
+          ucum_code: "1"
+          unit_type: count
+          usage_context: staff_metrics
+      OBJECT:
+        description: Object count unit - for museum/archive object counts
+        meaning: hc:ObjectUnit
+        annotations:
+          ucum_code: "1"
+          unit_type: count
+          usage_context: collection_metrics
+      FACE:
+        description: Face count unit - for unique faces in photo collections
+        meaning: hc:FaceUnit
+        annotations:
+          ucum_code: "1"
+          unit_type: count
+          usage_context: digital_metrics
+
+      # Unknown/unspecified
+      UNKNOWN:
+        description: Unit not specified or unknown
+        annotations:
+          unit_type: unknown

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

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

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

@@ -0,0 +1,43 @@
+id: https://nde.nl/ontology/hc/enum/QuantityTypeEnum
+name: QuantityTypeEnum
+title: Quantity Type Enum
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  qudt: http://qudt.org/schema/qudt/
+  schema: http://schema.org/
+imports:
+- linkml:types
+default_prefix: hc
+enums:
+  QuantityTypeEnum:
+    description: >-
+      Type of quantity being measured.
+    enum_uri: hc:QuantityTypeEnum
+    permissible_values:
+      STAFF_COUNT:
+        description: Number of staff members or employees.
+        meaning: schema:numberOfEmployees
+      COLLECTION_SIZE:
+        description: Number of items in a collection.
+        meaning: schema:size
+      VISITOR_COUNT:
+        description: Number of visitors (annual, daily, etc.).
+        meaning: schema:numberOfAttendees
+      BUDGET_AMOUNT:
+        description: Financial amount (budget, revenue, cost).
+        meaning: schema:amount
+      AREA:
+        description: Physical area or floor space.
+        meaning: schema:floorSize
+      DURATION:
+        description: Time duration or period.
+        meaning: schema:duration
+      LINEAR_EXTENT:
+        description: Linear measurement (e.g., archive meters).
+        meaning: qudt:Length
+      CAPACITY:
+        description: Maximum capacity (seats, storage, etc.).
+        meaning: schema:maximumAttendeeCapacity
+      OTHER:
+        description: Other type of quantity not listed.

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

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

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

@@ -1,15 +0,0 @@
-id: https://nde.nl/ontology/hc/slot/annual_participants
-name: annual_participants_slot
-title: Annual Participants Slot
-prefixes:
-  linkml: https://w3id.org/linkml/
-  hc: https://nde.nl/ontology/hc/
-  schema: http://schema.org/
-imports:
-- linkml:types
-default_prefix: hc
-slots:
-  annual_participants:
-    description: "[AUTO-GENERATED STUB] Annual Participants"
-    range: string
-    slot_uri: hc:annualParticipants

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

@@ -0,0 +1,33 @@
+id: https://nde.nl/ontology/hc/slot/applies_or_applied_to_call
+name: applies_or_applied_to_call_slot
+title: Applies Or Applied To Call Slot
+prefixes:
+  dcterms: http://purl.org/dc/terms/
+  hc: https://nde.nl/ontology/hc/
+  linkml: https://w3id.org/linkml/
+  schema: http://schema.org/
+  rico: https://www.ica.org/standards/RiC/ontology#
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  applies_or_applied_to_call:
+    description: >-
+      The funding call or opportunity that this requirement applies (or applied) to.
+      Uses RiC-O style temporal naming to indicate the relationship may be
+      current or historical.
+    range: uriorcurie
+    slot_uri: rico:appliesOrAppliedTo
+    exact_mappings:
+      - schema:isRelatedTo
+    close_mappings:
+      - dcterms:relation
+      - rico:isOrWasRelatedTo
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: >-
+        Applicable to all heritage custodian types for funding requirements.
+      custodian_types_primary: M
+      specificity_score: 0.6
+      specificity_rationale: >-
+        Moderately specific slot for funding requirement tracking.

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

@@ -1,28 +0,0 @@
-id: https://nde.nl/ontology/hc/slot/applies_to_call
-name: applies_to_call_slot
-title: Applies To Call Slot
-prefixes:
-  dcterms: http://purl.org/dc/terms/
-  hc: https://nde.nl/ontology/hc/
-  linkml: https://w3id.org/linkml/
-  schema: http://schema.org/
-imports:
-- linkml:types
-default_prefix: hc
-slots:
-  applies_to_call:
-    description: >-
-      Call or announcement that something applies to.
-    range: string
-    slot_uri: schema:isRelatedTo
-    close_mappings:
-      - schema:isRelatedTo
-      - dcterms:relation
-    annotations:
-      custodian_types: '["*"]'
-      custodian_types_rationale: >-
-        Applicable to all heritage custodian types.
-      custodian_types_primary: M
-      specificity_score: 0.5
-      specificity_rationale: >-
-        Moderately specific slot.

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

@@ -0,0 +1,26 @@
+id: https://nde.nl/ontology/hc/slot/approximation_level
+name: approximation_level_slot
+title: Approximation Level Slot
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  approximation_level:
+    description: >-
+      Level of approximation/uncertainty for a value.
+      
+      See ApproximationLevelEnum for valid values:
+      - EXACT: Known with certainty
+      - APPROXIMATE: Close but not exact
+      - ESTIMATED: Calculated/inferred
+      - UNCERTAIN: Significant doubt
+      - UNKNOWN: Cannot be determined
+    range: string
+    slot_uri: hc:approximationLevel
+    annotations:
+      specificity_score: 0.30
+      specificity_rationale: >-
+        Approximation level is broadly useful for expressing uncertainty.

frontend/public/schemas/20251121/linkml/modules/slots/archive/annual_participants_archived_20260115.yaml

@@ -0,0 +1,21 @@
+# ARCHIVED 2026-01-15: Migrated to has_or_had_annual_participant_count
+# Reason: RiC-O style temporal naming convention (Rule 39)
+# Replacement: has_or_had_annual_participant_count
+# Affected classes: EducationCenter
+id: https://nde.nl/ontology/hc/slot/annual_participants
+name: annual_participants_slot
+title: Annual Participants Slot (ARCHIVED)
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  annual_participants:
+    description: "[ARCHIVED] Annual Participants - Use has_or_had_annual_participant_count instead"
+    range: string
+    slot_uri: hc:annualParticipants
+    deprecated: true
+    deprecated_element_has_exact_replacement: has_or_had_annual_participant_count

frontend/public/schemas/20251121/linkml/modules/slots/archive/applies_to_call_archived_20260115.yaml

@@ -0,0 +1,27 @@
+# ARCHIVED 2026-01-15: Migrated to applies_or_applied_to_call
+# Reason: RiC-O style temporal naming convention (Rule 39)
+# Replacement: applies_or_applied_to_call
+# Affected classes: FundingRequirement
+id: https://nde.nl/ontology/hc/slot/applies_to_call
+name: applies_to_call_slot
+title: Applies To Call Slot (ARCHIVED)
+prefixes:
+  dcterms: http://purl.org/dc/terms/
+  hc: https://nde.nl/ontology/hc/
+  linkml: https://w3id.org/linkml/
+  schema: http://schema.org/
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  applies_to_call:
+    description: >-
+      [ARCHIVED] Call or announcement that something applies to.
+      Use applies_or_applied_to_call instead.
+    range: string
+    slot_uri: schema:isRelatedTo
+    deprecated: true
+    deprecated_element_has_exact_replacement: applies_or_applied_to_call
+    close_mappings:
+      - schema:isRelatedTo
+      - dcterms:relation

frontend/public/schemas/20251121/linkml/modules/slots/archive/area_hectares_archived_20260115.yaml

@@ -1,3 +1,11 @@
+# ARCHIVED: 2026-01-15
+# REASON: Migrated to has_area_in_hectare slot
+# MIGRATION: Migration 34 - area_hectares -> has_area_in_hectare
+# AFFECTED CLASS: OutdoorSite
+# NOTES: Original slot used string range, new slot uses float range
+#        slot_fixes.yaml suggested Area+MeasureUnit classes but 
+#        has_area_in_hectare already exists with proper semantics
+
 id: https://nde.nl/ontology/hc/slot/area_hectares
 name: area_hectares_slot
 title: Area Hectares Slot

frontend/public/schemas/20251121/linkml/modules/slots/archive/arrangement_notes_archived_20260115.yaml

@@ -1,3 +1,11 @@
+# ARCHIVED: 2026-01-15
+# REASON: Migrated to has_arrangement_note (RiC-O style naming convention)
+# MIGRATION: slot_fixes.yaml entry for arrangement_notes
+# AFFECTED CLASS: CustodianArchive.yaml
+# NEW SLOT: has_arrangement_note (multivalued)
+#
+# Original slot definition preserved below for reference:
+# ---
 id: https://nde.nl/ontology/hc/slot/arrangement_notes
 name: arrangement_notes_slot
 title: Arrangement Notes Slot

frontend/public/schemas/20251121/linkml/modules/slots/archive/available_caption_languages_archived_20260115.yaml

@@ -1,3 +1,11 @@
+# ARCHIVED: 2026-01-15
+# REASON: Migrated to has_available_caption_language (RiC-O style naming convention)
+# MIGRATION: slot_fixes.yaml entry for available_caption_languages
+# AFFECTED CLASS: VideoPost.yaml
+# NEW SLOT: has_available_caption_language (multivalued string)
+#
+# Original slot definition preserved below for reference:
+# ---
 id: https://nde.nl/ontology/hc/slot/available_caption_languages
 name: available_caption_languages_slot
 title: Available Caption Languages Slot

frontend/public/schemas/20251121/linkml/modules/slots/archive/beneficiary_group_archived_20260115.yaml

@@ -1,6 +1,13 @@
+# ARCHIVED 2026-01-15: beneficiary_group
+# Migrated to: has_or_had_beneficiary (RiC-O style naming)
+# Reason: Slot naming convention compliance (Rule 39)
+# Session: session-2026-01-15-slot-migrations
+# 
+# Original slot preserved below for reference:
+
 id: https://nde.nl/ontology/hc/slot/beneficiary_group
 name: beneficiary_group_slot
-title: Beneficiary Groups Slot
+title: Beneficiary Groups Slot (ARCHIVED)
 prefixes:
   linkml: https://w3id.org/linkml/
   hc: https://nde.nl/ontology/hc/
@@ -10,42 +17,30 @@ imports:
 default_prefix: hc
 slots:
   beneficiary_group:
-    description: 'Who benefits from the organization''s programs and services.
+    description: >-
-
+      ARCHIVED: Use has_or_had_beneficiary instead.
+      
+      Who benefits from the organization's programs and services.
 
       Identifies target populations:
-
       - **Heritage organizations**: Museums, archives, libraries, societies
-
       - **Heritage professionals**: Conservators, curators, archivists, educators
-
       - **Local communities**: Residents near heritage sites, indigenous peoples
-
       - **Policy makers**: Government officials, legislators, planners
-
       - **Students and researchers**: Academic community, early-career professionals
-
       - **General public**: Tourists, volunteers, heritage enthusiasts
-
       - **Property owners**: Private owners of heritage buildings
-
       - **Emergency responders**: First responders, military, disaster relief
 
-
       Beneficiary identification clarifies organizational impact.
 
-
       Examples:
-
       - "Heritage organizations, Local communities, Policy makers, General public"
-
       - "Conservation professionals, Students, Heritage property owners"
-
       - "Museums and libraries, Heritage managers, Volunteers"
-
       - "Indigenous communities, Cultural rights holders, Traditional practitioners"
-
-      '
     range: string
     multivalued: true
     slot_uri: schema:audience
+    deprecated: "Use has_or_had_beneficiary instead"
+    deprecated_element_has_exact_replacement: has_or_had_beneficiary

frontend/public/schemas/20251121/linkml/modules/slots/archive/branch_head_archived_20260114.yaml

@@ -1,3 +1,11 @@
+# ARCHIVED: 2026-01-14
+# REASON: Migrated to has_or_had_head per Rule 53 (Full Slot Migration)
+# NEW SLOT: has_or_had_head.yaml with org:hasMember slot_uri and Person range
+# MIGRATION SESSION: session-2026-01-14-final-migrations
+#
+# Original slot used custom hc:branchHead predicate with string range.
+# New slot uses W3C ORG standard pattern with Person class for better semantics.
+
 id: https://nde.nl/ontology/hc/slot/branch_head
 name: branch_head_slot
 title: Branch Head Slot
@@ -20,3 +28,4 @@ slots:
       '
     range: string
     slot_uri: hc:branchHead
+    deprecated: "ARCHIVED 2026-01-14: Use has_or_had_head instead"

frontend/public/schemas/20251121/linkml/modules/slots/archive/building_floor_area_sqm_archived_20260115.yaml

@@ -0,0 +1,40 @@
+# =============================================================================
+# ARCHIVED SLOT: building_floor_area_sqm
+# =============================================================================
+# Archive Date: 2026-01-15
+# Archived By: session-2026-01-15-area-migration
+# Reason: Migrated to generic has_or_had_area slot with Area class per Rule 53.
+#         The bespoke slot violated the principle that slots should use generic
+#         predicates that can be reused across multiple classes.
+#
+# Migration Target (per slot_fixes.yaml):
+#   - Slot: has_or_had_area (generic)
+#   - Class: Area (with area_value, has_or_had_unit, measurement_date, etc.)
+#   - Enum: MeasureUnitEnum (SQUARE_METER, HECTARE, ACRE, etc.)
+#
+# Classes Updated:
+#   - HistoricBuilding.yaml: Now uses has_or_had_area with range Area
+#
+# The generic pattern allows:
+#   - Multiple area measurements over time (multivalued)
+#   - Different units (square meters, hectares, square feet)
+#   - Measurement metadata (date, method, is_estimate)
+#   - Temporal semantics via has_or_had_ prefix (Rule 39)
+# =============================================================================
+
+id: https://nde.nl/ontology/hc/slot/building_floor_area_sqm
+name: building_floor_area_sqm_slot
+title: Building Floor Area Sqm Slot
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  building_floor_area_sqm:
+    description: 'Floor area of building in square meters.
+
+      '
+    range: float
+    slot_uri: hc:buildingFloorAreaSqm

frontend/public/schemas/20251121/linkml/modules/slots/archive/has_area_in_hectare_archived_20260115.yaml

@@ -0,0 +1,55 @@
+# =============================================================================
+# ARCHIVED SLOT: has_area_in_hectare
+# =============================================================================
+# Archive Date: 2026-01-15
+# Archived By: session-2026-01-15-area-migration
+# Reason: CORRECTED - This bespoke slot was incorrectly created in a previous
+#         session. It violated Rule 53 (Full Slot Migration) which requires
+#         using GENERIC predicates from slot_fixes.yaml, NOT domain-specific ones.
+#
+# Migration Target (per slot_fixes.yaml):
+#   - Slot: has_or_had_area (generic)
+#   - Class: Area (with area_value, has_or_had_unit, measurement_date, etc.)
+#   - Enum: MeasureUnitEnum (HECTARE, SQUARE_METER, ACRE, etc.)
+#
+# Classes Updated:
+#   - OutdoorSite.yaml: Now uses has_or_had_area with range Area
+#
+# The generic pattern allows:
+#   - Multiple area measurements over time (multivalued)
+#   - Different units (hectares, square meters, acres)
+#   - Measurement metadata (date, method, is_estimate)
+#   - Temporal semantics via has_or_had_ prefix (Rule 39)
+# =============================================================================
+
+id: https://nde.nl/ontology/hc/slot/has_area_in_hectare
+name: has_area_in_hectare_slot
+title: Has Area In Hectares Slot
+prefixes:
+  geosparql: http://www.opengis.net/ont/geosparql#
+  hc: https://nde.nl/ontology/hc/
+  linkml: https://w3id.org/linkml/
+  schema: http://schema.org/
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  has_area_in_hectare:
+    description: 'Area of outdoor site in hectares.
+
+
+      Schema.org: size for area measurement.
+
+      '
+    range: float
+    slot_uri: schema:size
+    close_mappings:
+    - schema:size
+    related_mappings:
+    - geosparql:hasGeometry
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: Applicable to all heritage custodian types.
+      custodian_types_primary: M
+      specificity_score: 0.5
+      specificity_rationale: Moderately specific slot.

frontend/public/schemas/20251121/linkml/modules/slots/archive/policy_approved_by_archived_20260115.yaml

@@ -0,0 +1,32 @@
+# ARCHIVED: 2026-01-15
+# REASON: Migrated to is_or_was_approved_by + Approver class (Rule 39, Rule 53)
+# REPLACEMENT: is_or_was_approved_by with range Approver
+# MIGRATION: Migration 30 - approved_by family consolidation
+# 
+# This slot was specific to StorageConditionPolicy. It has been replaced by
+# the generic is_or_was_approved_by slot which uses the Approver class for
+# structured approval tracking with temporal semantics.
+#
+# Original slot preserved below for reference.
+
+id: https://nde.nl/ontology/hc/slot/policy_approved_by
+name: policy_approved_by_slot
+title: Policy Approved By Slot (ARCHIVED)
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  policy_approved_by:
+    description: |
+      ARCHIVED: 2026-01-15
+      REPLACEMENT: is_or_was_approved_by with range Approver
+      
+      Original description:
+      Person or body that approved this policy.
+    range: string
+    slot_uri: hc:policyApprovedBy
+    deprecated: "Use is_or_was_approved_by with Approver class instead"
+    deprecated_element_has_exact_replacement: is_or_was_approved_by

frontend/public/schemas/20251121/linkml/modules/slots/archive/was_approved_by_archived_20260115.yaml

@@ -0,0 +1,52 @@
+# ARCHIVED: 2026-01-15
+# REASON: Migrated to is_or_was_approved_by + Approver class (Rule 39, Rule 53)
+# REPLACEMENT: is_or_was_approved_by with range Approver
+# MIGRATION: Migration 30 - approved_by family consolidation
+# 
+# This slot was used in Budget class. It has been replaced by the generic
+# is_or_was_approved_by slot which uses the Approver class for structured
+# approval tracking with temporal semantics following RiC-O naming conventions.
+#
+# Original slot preserved below for reference.
+
+id: https://nde.nl/ontology/hc/slot/was_approved_by
+name: was_approved_by_slot
+title: Was Approved By Slot (ARCHIVED)
+prefixes:
+  dcterms: http://purl.org/dc/terms/
+  hc: https://nde.nl/ontology/hc/
+  linkml: https://w3id.org/linkml/
+  prov: http://www.w3.org/ns/prov#
+  schema: http://schema.org/
+imports:
+- linkml:types
+default_prefix: hc
+slots:
+  was_approved_by:
+    description: |
+      ARCHIVED: 2026-01-15
+      REPLACEMENT: is_or_was_approved_by with range Approver
+      
+      Original description:
+      Governance body or authority that approved budget.
+
+      **Examples**:
+      - "Board of Directors"
+      - "Executive Committee"
+      - "Ministry of Culture"
+      - "City Council"
+    range: string
+    slot_uri: prov:wasAttributedTo
+    exact_mappings:
+    - prov:wasAttributedTo
+    close_mappings:
+    - dcterms:creator
+    - prov:wasInfluencedBy
+    annotations:
+      custodian_types: '["*"]'
+      custodian_types_rationale: Applicable to all heritage custodian types.
+      custodian_types_primary: M
+      specificity_score: 0.5
+      specificity_rationale: Moderately specific slot.
+    deprecated: "Use is_or_was_approved_by with Approver class instead"
+    deprecated_element_has_exact_replacement: is_or_was_approved_by