fix(ci): use Python virtual environment for PEP 668 compliance

- Create venv at /opt/venv in each job
- Source venv/bin/activate before pip install and pytest commands
- Add python3-full package for complete venv support
- Fixes 'externally-managed-environment' error on Debian Bookworm

.forgejo/workflows/dspy-eval.yml

@@ -41,6 +41,7 @@ on:
 env:
   SERVER_IP: '91.98.224.44'
   SERVER_USER: 'root'
+  VENV_PATH: '/opt/venv'
 
 jobs:
   # ==========================================================================
@@ -49,27 +50,30 @@ jobs:
   unit-tests:
     name: Layer 1 - Unit Tests
     runs-on: ubuntu-latest
-    # Note: No container block - use default node:20-bookworm with Python installed via apt
     timeout-minutes: 10
     
     steps:
       - uses: https://github.com/actions/checkout@v4
       
-      - name: Install Python
+      - name: Setup Python with virtual environment
         run: |
           apt-get update
-          apt-get install -y python3 python3-pip python3-venv
-          python3 --version
+          apt-get install -y python3 python3-pip python3-venv python3-full
+          python3 -m venv ${{ env.VENV_PATH }}
+          echo "Python version: $(python3 --version)"
+          echo "Venv created at ${{ env.VENV_PATH }}"
       
       - name: Install dependencies
         run: |
-          python3 -m pip install --upgrade pip
-          python3 -m pip install -e ".[dev]"
-          python3 -m pip install rapidfuzz
+          source ${{ env.VENV_PATH }}/bin/activate
+          pip install --upgrade pip
+          pip install -e ".[dev]"
+          pip install rapidfuzz
       
       - name: Run Layer 1 unit tests
         run: |
-          python3 -m pytest tests/dspy_gitops/test_layer1_unit.py \
+          source ${{ env.VENV_PATH }}/bin/activate
+          python -m pytest tests/dspy_gitops/test_layer1_unit.py \
             -v --tb=short \
             --junit-xml=layer1-results.xml
       
@@ -86,7 +90,6 @@ jobs:
   dspy-module-tests:
     name: Layer 2 - DSPy Module Tests
     runs-on: ubuntu-latest
-    # Note: No container block - use default node:20-bookworm with Python installed via apt
     timeout-minutes: 20
     needs: unit-tests
     
@@ -96,22 +99,25 @@ jobs:
     steps:
       - uses: https://github.com/actions/checkout@v4
       
-      - name: Install Python
+      - name: Setup Python with virtual environment
         run: |
           apt-get update
-          apt-get install -y python3 python3-pip python3-venv
+          apt-get install -y python3 python3-pip python3-venv python3-full
+          python3 -m venv ${{ env.VENV_PATH }}
       
       - name: Install dependencies
         run: |
-          python3 -m pip install --upgrade pip
-          python3 -m pip install -e ".[dev]"
-          python3 -m pip install dspy-ai httpx rapidfuzz litellm
+          source ${{ env.VENV_PATH }}/bin/activate
+          pip install --upgrade pip
+          pip install -e ".[dev]"
+          pip install dspy-ai httpx rapidfuzz litellm
       
       - name: Run Layer 2 DSPy tests
         env:
           ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
         run: |
-          python3 -m pytest tests/dspy_gitops/test_layer2_dspy.py \
+          source ${{ env.VENV_PATH }}/bin/activate
+          python -m pytest tests/dspy_gitops/test_layer2_dspy.py \
             -v --tb=short \
             --junit-xml=layer2-results.xml
       
@@ -128,23 +134,24 @@ jobs:
   integration-tests:
     name: Layer 3 - Integration Tests
     runs-on: ubuntu-latest
-    # Note: No container block - use default node:20-bookworm with Python installed via apt
     timeout-minutes: 15
     needs: unit-tests
     
     steps:
       - uses: https://github.com/actions/checkout@v4
       
-      - name: Install system dependencies
+      - name: Setup Python with virtual environment
         run: |
           apt-get update
-          apt-get install -y openssh-client curl python3 python3-pip python3-venv
+          apt-get install -y openssh-client curl python3 python3-pip python3-venv python3-full
+          python3 -m venv ${{ env.VENV_PATH }}
       
       - name: Install Python dependencies
         run: |
-          python3 -m pip install --upgrade pip
-          python3 -m pip install -e ".[dev]"
-          python3 -m pip install httpx pytest-asyncio
+          source ${{ env.VENV_PATH }}/bin/activate
+          pip install --upgrade pip
+          pip install -e ".[dev]"
+          pip install httpx pytest-asyncio
       
       - name: Setup SSH for tunnel
         run: |
@@ -177,7 +184,8 @@ jobs:
           OXIGRAPH_ENDPOINT: "http://127.0.0.1:7878"
           ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
         run: |
-          python3 -m pytest tests/dspy_gitops/test_layer3_integration.py \
+          source ${{ env.VENV_PATH }}/bin/activate
+          python -m pytest tests/dspy_gitops/test_layer3_integration.py \
             -v --tb=short \
             --junit-xml=layer3-results.xml
       
@@ -194,7 +202,6 @@ jobs:
   comprehensive-eval:
     name: Layer 4 - Comprehensive Evaluation
     runs-on: ubuntu-latest
-    # Note: No container block - use default node:20-bookworm with Python installed via apt
     timeout-minutes: 60
     needs: [unit-tests, dspy-module-tests, integration-tests]
     
@@ -204,16 +211,18 @@ jobs:
     steps:
       - uses: https://github.com/actions/checkout@v4
       
-      - name: Install system dependencies
+      - name: Setup Python with virtual environment
         run: |
           apt-get update
-          apt-get install -y openssh-client curl python3 python3-pip python3-venv
+          apt-get install -y openssh-client curl python3 python3-pip python3-venv python3-full
+          python3 -m venv ${{ env.VENV_PATH }}
       
       - name: Install Python dependencies
         run: |
-          python3 -m pip install --upgrade pip
-          python3 -m pip install -e ".[dev]"
-          python3 -m pip install dspy-ai httpx rapidfuzz pandas pytest-json-report litellm
+          source ${{ env.VENV_PATH }}/bin/activate
+          pip install --upgrade pip
+          pip install -e ".[dev]"
+          pip install dspy-ai httpx rapidfuzz pandas pytest-json-report litellm
       
       - name: Setup SSH for tunnel
         run: |
@@ -235,7 +244,8 @@ jobs:
           ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
           OXIGRAPH_ENDPOINT: "http://127.0.0.1:7878"
         run: |
-          python3 -m pytest tests/dspy_gitops/test_layer4_comprehensive.py \
+          source ${{ env.VENV_PATH }}/bin/activate
+          python -m pytest tests/dspy_gitops/test_layer4_comprehensive.py \
             -v --tb=short \
             --junit-xml=layer4-results.xml \
             --json-report \
@@ -243,7 +253,8 @@ jobs:
       
       - name: Generate metrics summary
         run: |
-          python3 -c "
+          source ${{ env.VENV_PATH }}/bin/activate
+          python -c "
           import json
           from datetime import datetime
           
@@ -319,4 +330,3 @@ jobs:
           echo "============================================"
           echo "  All required quality gates passed!"
           echo "============================================"
-

.opencode/rules/ontology-to-linkml-mapping-convention.md

@@ -34,12 +34,44 @@ These properties express **semantic relationships** to external ontology terms:
 
 | Property | SKOS Predicate | Meaning | Use When |
 |----------|---------------|---------|----------|
-| `exact_mappings` | `skos:exactMatch` | Identical meaning | Different ontology, same semantics |
-| `close_mappings` | `skos:closeMatch` | Very similar meaning | Similar but not interchangeable |
+| `exact_mappings` | `skos:exactMatch` | **IDENTICAL meaning** | Different ontology, **SAME semantics** (interchangeable) |
+| `close_mappings` | `skos:closeMatch` | Very similar meaning | Similar but **NOT interchangeable** |
 | `related_mappings` | `skos:relatedMatch` | Semantically related | Broader conceptual relationship |
 | `narrow_mappings` | `skos:narrowMatch` | This is more specific | External term is broader |
 | `broad_mappings` | `skos:broadMatch` | This is more general | External term is narrower |
 
+### ⚠️ CRITICAL: `exact_mappings` Requires PRECISE Semantic Equivalence
+
+**`exact_mappings` means the terms are INTERCHANGEABLE** - you could substitute one for the other in any context without changing meaning.
+
+**Requirements for `exact_mappings`**:
+1. **Same definition**: Both terms must have equivalent definitions
+2. **Same scope**: Both terms cover the same set of instances
+3. **Same constraints**: Same domain/range restrictions apply
+4. **Bidirectional**: If A exactMatch B, then B exactMatch A
+
+**DO NOT use `exact_mappings` when**:
+- One term is a subset of the other (use `narrow_mappings`/`broad_mappings`)
+- Terms are similar but have different scopes (use `close_mappings`)
+- Terms are related but not equivalent (use `related_mappings`)
+- You're uncertain about equivalence (default to `close_mappings`)
+
+**Example - WRONG**:
+```yaml
+# PersonProfile is NOT equivalent to foaf:Person
+# PersonProfile is a structured document ABOUT a person, not the person themselves
+exact_mappings:
+  - foaf:Person  # ❌ WRONG - different semantics!
+```
+
+**Example - CORRECT**:
+```yaml
+# foaf:Person and schema:Person ARE equivalent
+# Both define "a person" with the same scope
+exact_mappings:
+  - schema:Person  # ✅ CORRECT - truly equivalent
+```
+
 ---
 
 ## 3. Mapping Workflow: Ontology → LinkML

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

@@ -1,5 +1,5 @@
 {
-  "generated": "2026-01-12T17:31:31.920Z",
+  "generated": "2026-01-13T00:48:37.685Z",
   "schemaRoot": "/schemas/20251121/linkml",
   "totalFiles": 2886,
   "categoryCounts": {

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

@@ -21,7 +21,20 @@ default_range: string
 
 classes:
   AdmissionInfo:
-      description: Structured admission price information from Google Maps
+      description: >-
+        Structured admission price information from Google Maps including
+        price value and notes about additional fees or conditions.
+        
+        Ontology mapping rationale:
+        - class_uri is schema:PriceSpecification because this represents
+          structured price information for museum/institution admission
+        - close_mappings includes schema:Offer for commercial offering context
+        - related_mappings includes schema:MonetaryAmount for price values
+      class_uri: schema:PriceSpecification
+      close_mappings:
+        - schema:Offer
+      related_mappings:
+        - schema:MonetaryAmount
       attributes:
         price:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  skos: http://www.w3.org/2004/02/skos/core#
 
 imports:
   - linkml:types
@@ -21,7 +22,20 @@ default_range: string
 
 classes:
   AlternativeName:
-      description: Alternative name with language and source information
+      description: >-
+        Alternative name with language and source information, representing
+        a variant or translated form of an institution's name.
+        
+        Ontology mapping rationale:
+        - class_uri is skos:altLabel because this represents an alternative
+          lexical label for a concept (the institution)
+        - exact_mappings includes schema:alternateName as both represent variant names
+        - related_mappings includes rdfs:label for general labeling context
+      class_uri: skos:altLabel
+      exact_mappings:
+        - schema:alternateName
+      related_mappings:
+        - rdfs:label
       attributes:
         name:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  rico: https://www.ica.org/standards/RiC/ontology#
 
 imports:
   - linkml:types
@@ -21,7 +22,20 @@ default_range: string
 
 classes:
   ArchiveInfo:
-      description: Archive reference
+      description: >-
+        Archive reference containing basic information about an archival
+        institution including name, website, and ISIL identifier.
+        
+        Ontology mapping rationale:
+        - class_uri is rico:Agent because archives are agents that create,
+          maintain, and provide access to records (RiC-O archival ontology)
+        - close_mappings includes schema:ArchiveOrganization for Schema.org alignment
+        - related_mappings includes prov:Agent for provenance agent role
+      class_uri: rico:Agent
+      close_mappings:
+        - schema:ArchiveOrganization
+      related_mappings:
+        - prov:Agent
       attributes:
         name:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  org: http://www.w3.org/ns/org#
 
 imports:
   - linkml:types
@@ -21,7 +22,24 @@ default_range: string
 
 classes:
   CareerEntry:
-      description: Career history entry
+      description: >-
+        Career history entry representing a single job position in a person's employment history.
+        Contains job title, company, location, dates, duration, and description of the role.
+        This represents observed employment data extracted from a profile source.
+        
+        Ontology mapping rationale:
+        - class_uri is org:Membership because this represents a relationship between a person
+          and an organization with a specific role, which is precisely what org:Membership models
+        - close_mappings includes schema:OrganizationRole as Schema.org's approach to
+          representing a person's role in an organization
+        - related_mappings includes org:Role (the abstract role) and prov:Entity (participates
+          in provenance chains as extracted data)
+      class_uri: org:Membership
+      close_mappings:
+        - schema:OrganizationRole
+      related_mappings:
+        - org:Role
+        - prov:Entity
       attributes:
         title:
           range: string

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  oa: http://www.w3.org/ns/oa#
+  dqv: http://www.w3.org/ns/dqv#
 
 imports:
   - linkml:types
@@ -21,7 +23,23 @@ default_range: string
 
 classes:
   ChAnnotatorAnnotationMetadata:
-      description: Metadata about the annotation
+      description: >-
+        Metadata about the CH-Annotator annotation including confidence scores,
+        verification status, and quality metrics.
+        
+        Ontology mapping rationale:
+        - class_uri is oa:Annotation because this represents metadata about an
+          annotation following the W3C Web Annotation Data Model.
+        - close_mappings includes dqv:QualityAnnotation because it captures
+          quality-related metadata (confidence, verification).
+        - related_mappings includes prov:Entity as the annotation metadata itself
+          is a provenance-tracked entity.
+      class_uri: oa:Annotation
+      close_mappings:
+        - dqv:QualityAnnotation
+      related_mappings:
+        - prov:Entity
+        - schema:Rating
       attributes:
         confidence_score:
           range: float

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  oa: http://www.w3.org/ns/oa#
+  pav: http://purl.org/pav/
 
 imports:
   - linkml:types
@@ -21,7 +23,22 @@ default_range: string
 
 classes:
   ChAnnotatorAnnotationProvenance:
-      description: Provenance for the annotation process
+      description: >-
+        Provenance information for the CH-Annotator annotation process,
+        tracking who/what created the annotation, when, and how.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Activity because annotation is an activity that
+          generates annotations from source data.
+        - close_mappings includes pav:Authoring to capture the creative aspect
+          of annotation as an authoring process.
+        - related_mappings includes oa:Annotation as the target of this provenance.
+      class_uri: prov:Activity
+      close_mappings:
+        - pav:Authoring
+      related_mappings:
+        - oa:Annotation
+        - prov:Agent
       attributes:
         annotation_agent:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  oa: http://www.w3.org/ns/oa#
 
 imports:
   - linkml:types
@@ -27,7 +28,24 @@ default_range: string
 
 classes:
   ChAnnotatorBlock:
-      description: CH-Annotator convention metadata and entity claims
+      description: >-
+        Container for CH-Annotator convention metadata and entity claims,
+        representing a complete annotation block following the CH-Annotator
+        convention (e.g., ch_annotator-v1_7_0).
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Collection because this aggregates multiple
+          annotation-related entities (claims, provenance, metadata).
+        - close_mappings includes oa:Annotation as it represents annotation
+          content following the Web Annotation model.
+        - related_mappings includes prov:Bundle as a related concept for
+          packaging provenance information.
+      class_uri: prov:Collection
+      close_mappings:
+        - oa:Annotation
+      related_mappings:
+        - prov:Bundle
+        - schema:Dataset
       attributes:
         convention_id:
           range: string

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  oa: http://www.w3.org/ns/oa#
+  rdf: http://www.w3.org/1999/02/22-rdf-syntax-ns#
 
 imports:
   - linkml:types
@@ -23,7 +25,24 @@ default_range: string
 
 classes:
   ChAnnotatorEntityClaim:
-      description: Individual claim about an entity
+      description: >-
+        Individual claim about an entity extracted using CH-Annotator convention.
+        Each claim represents an assertion about an entity attribute with
+        associated provenance and confidence information.
+        
+        Ontology mapping rationale:
+        - class_uri is rdf:Statement because a claim is fundamentally an
+          RDF-like statement (subject-predicate-object assertion).
+        - close_mappings includes oa:Annotation as claims are a form of
+          annotation body content.
+        - related_mappings includes prov:Entity as claims are provenance-tracked
+          entities themselves.
+      class_uri: rdf:Statement
+      close_mappings:
+        - oa:Annotation
+      related_mappings:
+        - prov:Entity
+        - schema:PropertyValue
       attributes:
         claim_type:
           range: string

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  skos: http://www.w3.org/2004/02/skos/core#
+  oa: http://www.w3.org/ns/oa#
 
 imports:
   - linkml:types
@@ -23,7 +25,24 @@ default_range: string
 
 classes:
   ChAnnotatorEntityClassification:
-      description: Entity classification in CH-Annotator taxonomy
+      description: >-
+        Entity classification in the CH-Annotator taxonomy, capturing hypernym
+        types (GRP, AGT, TOP, etc.) and subtypes (GRP.HER.ARC, GRP.HER.MUS).
+        Maps entities to the GLAMORCUBESFIXPHDNT heritage custodian taxonomy.
+        
+        Ontology mapping rationale:
+        - class_uri is skos:Concept because entity classification represents
+          a conceptual categorization within the CH-Annotator taxonomy.
+        - close_mappings includes oa:classifying as the annotation motivation
+          for classification activities.
+        - related_mappings includes prov:Entity and schema:CategoryCode as
+          related concepts for typed categorization.
+      class_uri: skos:Concept
+      close_mappings:
+        - oa:classifying
+      related_mappings:
+        - prov:Entity
+        - schema:CategoryCode
       attributes:
         hypernym:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  pav: http://purl.org/pav/
 
 imports:
   - linkml:types
@@ -21,7 +22,22 @@ default_range: string
 
 classes:
   ChAnnotatorIntegrationNote:
-      description: Note about how the file was created/integrated
+      description: >-
+        Note about how a file was created or integrated into the dataset,
+        documenting the source file, creation method, and integration process.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Derivation because integration notes describe how
+          data was derived from source files through transformation.
+        - close_mappings includes pav:importedFrom to capture the source-to-target
+          relationship in data integration.
+        - related_mappings includes prov:Activity as integration is an activity.
+      class_uri: prov:Derivation
+      close_mappings:
+        - pav:importedFrom
+      related_mappings:
+        - prov:Activity
+        - prov:Entity
       attributes:
         created_from:
           range: string

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

@@ -21,7 +21,23 @@ default_range: string
 
 classes:
   ChAnnotatorModel:
-      description: Annotator model information
+      description: >-
+        Information about the annotator model used for CH-Annotator extraction,
+        including the model name (e.g., glm-4.5-flash), convention identifier,
+        and annotation timestamp.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:SoftwareAgent because the annotator model is a
+          software agent that performs annotation activities.
+        - close_mappings includes schema:SoftwareApplication as the model
+          is a software application.
+        - related_mappings includes prov:Agent as the broader agent concept.
+      class_uri: prov:SoftwareAgent
+      close_mappings:
+        - schema:SoftwareApplication
+      related_mappings:
+        - prov:Agent
+        - prov:Entity
       attributes:
         model:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  pav: http://purl.org/pav/
 
 imports:
   - linkml:types
@@ -21,7 +22,24 @@ default_range: string
 
 classes:
   ChAnnotatorProvenance:
-      description: Provenance information for CH-Annotator extraction
+      description: >-
+        Provenance information for CH-Annotator extraction, tracking the
+        namespace, path/XPath to source data, timestamp, agent, and convention
+        used for extraction.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Entity because provenance information is itself
+          an entity that can be referenced and tracked.
+        - close_mappings includes pav:SourceAccessedAt as it captures access
+          to source data during extraction.
+        - related_mappings includes prov:Generation as extraction generates
+          new data from sources.
+      class_uri: prov:Entity
+      close_mappings:
+        - pav:SourceAccessedAt
+      related_mappings:
+        - prov:Generation
+        - prov:Activity
       attributes:
         namespace:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  geo: http://www.w3.org/2003/01/geo/wgs84_pos#
 
 imports:
   - linkml:types
@@ -21,7 +22,20 @@ default_range: string
 
 classes:
   CoordinateProvenance:
-      description: Provenance of coordinates
+      description: >-
+        Provenance of coordinates tracking the source, method, and metadata
+        for how geographic coordinates were obtained or resolved.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Entity because this represents provenance metadata
+          about a coordinate value (the coordinate source as an entity)
+        - close_mappings includes geo:Point for the coordinate data aspect
+        - related_mappings includes prov:Activity for the resolution activity
+      class_uri: prov:Entity
+      close_mappings:
+        - geo:Point
+      related_mappings:
+        - prov:Activity
       attributes:
         source_type:
           range: string

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  geo: http://www.w3.org/2003/01/geo/wgs84_pos#
+  sf: http://www.opengis.net/ont/sf#
 
 imports:
   - linkml:types
@@ -21,7 +23,24 @@ default_range: string
 
 classes:
   Coordinates:
-      description: Geographic coordinates
+      description: >-
+        Geographic coordinates representing a point location with latitude and longitude
+        (and optional precision). Used to locate heritage custodians, events, and other
+        geographically situated entities.
+        
+        Ontology mapping rationale:
+        - class_uri is geo:Point from WGS84 vocabulary, the standard for representing
+          points on Earth with lat/long coordinates
+        - close_mappings includes sf:Point from OGC Simple Features as an alternative
+          geometry representation
+        - related_mappings includes geo:SpatialThing (superclass) and schema:GeoCoordinates
+          as Schema.org's coordinate representation
+      class_uri: geo:Point
+      close_mappings:
+        - sf:Point
+      related_mappings:
+        - geo:SpatialThing
+        - schema:GeoCoordinates
       attributes:
         latitude:
           range: float

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  rdf: http://www.w3.org/1999/02/22-rdf-syntax-ns#
 
 imports:
   - linkml:types
@@ -21,7 +22,20 @@ default_range: string
 
 classes:
   CustodianLegalNameClaim:
-      description: Legal name claim with provenance
+      description: >-
+        Legal name claim with provenance, representing an assertion about
+        an institution's official registered legal name with extraction metadata.
+        
+        Ontology mapping rationale:
+        - class_uri is rdf:Statement because this represents a reified claim
+          (statement about a statement) with provenance metadata
+        - close_mappings includes prov:Entity as the claim itself is an entity
+        - related_mappings includes schema:legalName for the semantic content
+      class_uri: rdf:Statement
+      close_mappings:
+        - prov:Entity
+      related_mappings:
+        - schema:legalName
       attributes:
         claim_type:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  skos: http://www.w3.org/2004/02/skos/core#
 
 imports:
   - linkml:types
@@ -25,7 +26,21 @@ default_range: string
 
 classes:
   CustodianNameConsensus:
-      description: Consensus determination of custodian name
+      description: >-
+        Consensus determination of custodian name aggregating evidence from multiple
+        sources with confidence scoring, including emic/standardized forms, alternative
+        names, and former names.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Entity because this represents a derived data entity
+          resulting from consensus analysis across multiple sources
+        - close_mappings includes skos:Concept as it establishes a canonical naming
+        - related_mappings includes schema:name for the resulting name value
+      class_uri: prov:Entity
+      close_mappings:
+        - skos:Concept
+      related_mappings:
+        - schema:name
       attributes:
         claim_type:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  dqv: http://www.w3.org/ns/dqv#
 
 imports:
   - linkml:types
@@ -21,7 +22,25 @@ default_range: string
 
 classes:
   DataTierSummary:
-      description: Summary of data tiers present in entry
+      description: >-
+        Summary of data quality tiers present in an entry. Lists fields
+        by tier: TIER_1_AUTHORITATIVE (registries), TIER_2_VERIFIED
+        (institutional sources), TIER_3_CROWD_SOURCED (Wikidata, OSM),
+        TIER_4_INFERRED (NLP-extracted).
+        
+        Ontology mapping rationale:
+        - class_uri is dqv:QualityAnnotation from Data Quality Vocabulary
+          because this summarizes data quality levels across an entry
+        - close_mappings includes prov:Entity as the summary is itself
+          a traceable metadata entity
+        - related_mappings includes dqv:QualityMeasurement (quality metrics)
+          and schema:PropertyValue (tier assignments as property values)
+      class_uri: dqv:QualityAnnotation
+      close_mappings:
+        - prov:Entity
+      related_mappings:
+        - dqv:QualityMeasurement
+        - schema:PropertyValue
       attributes:
         TIER_1_AUTHORITATIVE:
           range: string

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  org: http://www.w3.org/ns/org#
+  crm: http://www.cidoc-crm.org/cidoc-crm/
 
 imports:
   - linkml:types
@@ -21,7 +23,25 @@ default_range: string
 
 classes:
   EducationEntry:
-      description: Educational background entry
+      description: >-
+        Educational background entry representing a single educational credential or
+        period of study at an institution. Contains institution name, degree, field of
+        study, dates, and description. This represents observed educational data
+        extracted from a profile source.
+        
+        Ontology mapping rationale:
+        - class_uri is org:Membership because education represents a temporal relationship
+          between a person and an educational institution (similar to employment)
+        - close_mappings includes schema:EducationalOccupationalCredential as Schema.org's
+          concept for educational credentials and qualifications
+        - related_mappings includes crm:E7_Activity (education is an activity with temporal
+          extent) and prov:Entity (participates in provenance chains)
+      class_uri: org:Membership
+      close_mappings:
+        - schema:EducationalOccupationalCredential
+      related_mappings:
+        - crm:E7_Activity
+        - prov:Entity
       attributes:
         institution:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  pav: http://purl.org/pav/
 
 imports:
   - linkml:types
@@ -21,7 +22,24 @@ default_range: string
 
 classes:
   ExtractionSourceInfo:
-      description: Information about extraction source (can be structured or freeform)
+      description: >-
+        Information about extraction source (can be structured or freeform).
+        Documents the field extracted, the extracted text content, and
+        the method used for extraction (pattern matching, LLM, etc.).
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Entity because extraction source info is a
+          traceable entity recording what was extracted and how
+        - close_mappings includes pav:SourceAccessedAt as this documents
+          a source that was accessed during extraction
+        - related_mappings includes prov:Derivation (the extraction is
+          derived from source) and schema:PropertyValue (field/value pair)
+      class_uri: prov:Entity
+      close_mappings:
+        - pav:SourceAccessedAt
+      related_mappings:
+        - prov:Derivation
+        - schema:PropertyValue
       attributes:
         field:
           range: string

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  skos: http://www.w3.org/2004/02/skos/core#
+  org: http://www.w3.org/ns/org#
 
 imports:
   - linkml:types
@@ -21,7 +23,20 @@ default_range: string
 
 classes:
   FormerName:
-      description: A former name of the institution with optional metadata
+      description: >-
+        A former name of the institution with optional temporal bounds and metadata,
+        representing historical naming that is no longer in official use.
+        
+        Ontology mapping rationale:
+        - class_uri is skos:hiddenLabel because former names are historical labels
+          that are no longer preferred but should still be searchable
+        - close_mappings includes org:changedBy for organizational change context
+        - related_mappings includes schema:alternateName for variant name relationships
+      class_uri: skos:hiddenLabel
+      close_mappings:
+        - org:changedBy
+      related_mappings:
+        - schema:alternateName
       attributes:
         name:
           range: string

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

@@ -25,7 +25,20 @@ default_range: string
 
 classes:
   GenealogiewerkbalkEnrichment:
-      description: Dutch genealogy archives registry data
+      description: >-
+        Dutch genealogy archives registry (Genealogiewerkbalk) data including
+        municipality, province, and associated archive information.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Entity because this represents enrichment data
+          derived from the Dutch genealogy archives registry
+        - close_mappings includes schema:Dataset for registry data semantics
+        - related_mappings includes prov:PrimarySource for source registry
+      class_uri: prov:Entity
+      close_mappings:
+        - schema:Dataset
+      related_mappings:
+        - prov:PrimarySource
       attributes:
         source:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  dcterms: http://purl.org/dc/terms/
 
 imports:
   - linkml:types
@@ -23,7 +24,25 @@ default_range: string
 
 classes:
   GhcidBlock:
-      description: GHCID generation metadata and history
+      description: >-
+        GHCID (Global Heritage Custodian Identifier) generation metadata
+        and history. Contains current GHCID string, UUID variants (v5, v8),
+        numeric form, generation timestamp, and history of GHCID changes
+        due to relocations, mergers, or collision resolution.
+        
+        Ontology mapping rationale:
+        - class_uri is dcterms:Identifier because GHCID is fundamentally
+          an identifier assignment with associated metadata
+        - close_mappings includes prov:Entity as identifier blocks are
+          traceable provenance entities themselves
+        - related_mappings includes schema:PropertyValue (identifier as
+          property) and prov:Generation (identifier creation event)
+      class_uri: dcterms:Identifier
+      close_mappings:
+        - prov:Entity
+      related_mappings:
+        - schema:PropertyValue
+        - prov:Generation
       attributes:
         ghcid_current:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  dcterms: http://purl.org/dc/terms/
 
 imports:
   - linkml:types
@@ -21,7 +22,21 @@ default_range: string
 
 classes:
   GhcidHistoryEntry:
-      description: Historical GHCID entry with validity period
+      description: >-
+        Historical GHCID entry with validity period tracking the evolution of
+        a Global Heritage Custodian Identifier over time, including reasons
+        for changes and supersession relationships.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Entity because this represents a historical state
+          of an identifier entity with temporal validity bounds
+        - close_mappings includes dcterms:Identifier for identifier semantics
+        - related_mappings includes prov:Revision for versioning context
+      class_uri: prov:Entity
+      close_mappings:
+        - dcterms:Identifier
+      related_mappings:
+        - prov:Revision
       attributes:
         ghcid:
           range: string

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

@@ -34,7 +34,28 @@ default_range: string
 
 classes:
   GoogleMapsEnrichment:
-      description: Full Google Maps Places API enrichment data
+      class_uri: prov:Entity
+      description: >-
+        Full Google Maps Places API enrichment data for a heritage custodian location.
+        
+        prov:Entity - "An entity is a physical, digital, conceptual, or other kind of thing
+        with some fixed aspects; entities may be real or imaginary."
+        
+        This class represents ENRICHMENT DATA extracted from Google Maps API about a place,
+        not the place itself. It captures metadata like ratings, reviews, photos, opening hours,
+        and address components that describe a heritage institution's physical location.
+        
+        Mapping rationale:
+        - Uses prov:Entity because this is data derived from an external source (Google Maps API)
+        - The enrichment has clear provenance (API call, timestamp, place_id)
+        - NOT schema:Place - that would represent the actual location, not metadata about it
+        - Related to schema:Place as the subject being described
+      close_mappings:
+        - schema:PropertyValue     # Similar: structured metadata about something
+      related_mappings:
+        - schema:Place             # The subject this enrichment describes
+        - schema:LocalBusiness     # Related: Google Maps often returns business data
+        - prov:Generation          # The activity that created this enrichment
       attributes:
         place_id:
           range: string
@@ -281,9 +302,6 @@ classes:
         alternate_address:
           range: string
           description: Alternative address for the location
-        note:
-          range: string
-          description: Additional notes about the Google Maps entry
         wheelchair_accessible:
           range: boolean
           description: Whether the location is wheelchair accessible

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

@@ -27,7 +27,20 @@ default_range: string
 
 classes:
   GoogleMapsPlaywrightEnrichment:
-      description: Google Maps data extracted via Playwright browser automation
+      description: >-
+        Google Maps data extracted via Playwright browser automation including
+        place details, ratings, reviews, opening hours, photos, and popular times.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Entity because this represents enrichment data
+          (an entity) derived from Google Maps via automated extraction
+        - close_mappings includes schema:Place for location/place semantics
+        - related_mappings includes schema:LocalBusiness for business attributes
+      class_uri: prov:Entity
+      close_mappings:
+        - schema:Place
+      related_mappings:
+        - schema:LocalBusiness
       attributes:
         scrape_timestamp:
           range: datetime

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

@@ -21,7 +21,23 @@ default_range: string
 
 classes:
   GoogleReview:
-      description: Google Maps review
+      description: >-
+        Google Maps review for a heritage institution. Contains author
+        information, rating (1-5 stars), review text, and publication
+        timestamp. Used for crowd-sourced quality assessment data.
+        
+        Ontology mapping rationale:
+        - class_uri is schema:Review which is the standard Schema.org
+          type for user reviews and ratings
+        - close_mappings includes schema:UserReview (specific review subtype)
+        - related_mappings includes prov:Entity (review as traceable data)
+          and schema:Rating (the numeric rating component)
+      class_uri: schema:Review
+      close_mappings:
+        - schema:UserReview
+      related_mappings:
+        - prov:Entity
+        - schema:Rating
       attributes:
         author_name:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  org: http://www.w3.org/ns/org#
 
 imports:
   - linkml:types
@@ -21,7 +22,25 @@ default_range: string
 
 classes:
   HeritageExperienceEntry:
-      description: Heritage sector specific experience
+      description: >-
+        Heritage sector specific work experience entry. Contains job title,
+        company, relevance assessment, heritage institution type code
+        (A/L/M/etc.), and demonstrated skills. Used for assessing person
+        profiles' heritage sector relevance.
+        
+        Ontology mapping rationale:
+        - class_uri is org:Membership because heritage experience represents
+          a person's membership/role within heritage organizations
+        - close_mappings includes schema:OrganizationRole for web semantics
+          compatibility with role-based employment modeling
+        - related_mappings includes prov:Entity (experience as traceable
+          data) and schema:Occupation (the occupation/role held)
+      class_uri: org:Membership
+      close_mappings:
+        - schema:OrganizationRole
+      related_mappings:
+        - prov:Entity
+        - schema:Occupation
       attributes:
         title:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  dcterms: http://purl.org/dc/terms/
 
 imports:
   - linkml:types
@@ -21,7 +22,20 @@ default_range: string
 
 classes:
   IsilCodeEntry:
-      description: Structured ISIL code entry from Nationaal Archief
+      description: >-
+        Structured ISIL code entry from Nationaal Archief registry containing
+        the ISIL identifier, institution name, assignment date, and remarks.
+        
+        Ontology mapping rationale:
+        - class_uri is dcterms:Identifier because ISIL is a standardized
+          identifier for libraries, archives, and similar institutions
+        - close_mappings includes schema:PropertyValue for structured identifier data
+        - related_mappings includes prov:Entity for provenance tracking
+      class_uri: dcterms:Identifier
+      close_mappings:
+        - schema:PropertyValue
+      related_mappings:
+        - prov:Entity
       attributes:
         code:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  dqv: http://www.w3.org/ns/dqv#
 
 imports:
   - linkml:types
@@ -20,8 +21,21 @@ imports:
 default_range: string
 
 classes:
-  LLMVerification:
-      description: LLM-based verification results for enrichment data
+  LlmVerification:
+      description: >-
+        LLM-based verification results for enrichment data including match status,
+        confidence scores, entity type classification, and reasoning explanation.
+        
+        Ontology mapping rationale:
+        - class_uri is dqv:QualityMeasurement because this represents a quality
+          assessment/verification measurement of enrichment data
+        - close_mappings includes prov:Activity for the verification activity
+        - related_mappings includes prov:SoftwareAgent for the LLM agent
+      class_uri: dqv:QualityMeasurement
+      close_mappings:
+        - prov:Activity
+      related_mappings:
+        - prov:SoftwareAgent
       attributes:
         is_match:
           range: boolean

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  geo: http://www.w3.org/2003/01/geo/wgs84_pos#
 
 imports:
   - linkml:types
@@ -24,7 +25,26 @@ default_range: string
 
 classes:
   LocationResolution:
-      description: Method and result of settlement resolution
+      description: >-
+        Method and result of settlement resolution for GHCID generation.
+        Records how a location was resolved from source data (coordinates, 
+        place names, addresses) to a standardized settlement using GeoNames
+        or other authoritative geographic databases.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Location because this class represents the result
+          of resolving/identifying a geographic location, which PROV-O defines
+          as "an identifiable geographic place" with various expression methods
+        - close_mappings includes geo:SpatialThing because the resolution 
+          produces spatial extent information (coordinates, feature codes)
+        - related_mappings includes schema:Place (general place concept) and
+          prov:Entity (the resolution result is a traceable entity)
+      class_uri: prov:Location
+      close_mappings:
+        - geo:SpatialThing
+      related_mappings:
+        - schema:Place
+        - prov:Entity
       attributes:
         method:
           range: LocationResolutionMethodEnum
@@ -128,10 +148,7 @@ classes:
           description: Whether micro-hamlet was skipped in favor of larger settlement
         note:
           range: string
-          description: Additional note about the resolution
-        note:
-          range: string
-          description: Additional notes about the resolution (alternative key)
+          description: Additional notes about the resolution
         text_source:
           range: string
           description: Text source for fallback resolution (e.g., 'various')

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  skos: http://www.w3.org/2004/02/skos/core#
 
 imports:
   - linkml:types
@@ -21,7 +22,24 @@ default_range: string
 
 classes:
   MatchingSource:
-      description: Source that contributed to name consensus
+      description: >-
+        Source that contributed to name consensus during entity resolution.
+        Records the source identifier, the name variant from that source,
+        and a match score indicating confidence in the match.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Entity because matching sources are traceable
+          entities that contribute to entity resolution decisions
+        - close_mappings includes skos:mappingRelation as matching sources
+          establish relationships between name variants across sources
+        - related_mappings includes prov:PrimarySource (sources of evidence)
+          and schema:PropertyValue (source/name/score as property values)
+      class_uri: prov:Entity
+      close_mappings:
+        - skos:mappingRelation
+      related_mappings:
+        - prov:PrimarySource
+        - schema:PropertyValue
       attributes:
         source:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  crm: http://www.cidoc-crm.org/cidoc-crm/
 
 imports:
   - linkml:types
@@ -21,7 +22,24 @@ default_range: string
 
 classes:
   MowInscription:
-      description: Memory of the World inscription reference
+      description: >-
+        UNESCO Memory of the World (MoW) inscription reference. Contains
+        Wikidata ID, inscription name/title, and associated country code.
+        MoW inscriptions recognize documentary heritage of world significance.
+        
+        Ontology mapping rationale:
+        - class_uri is crm:E73_Information_Object from CIDOC-CRM because
+          MoW inscriptions are information objects about documentary heritage
+        - close_mappings includes schema:CreativeWork as inscriptions
+          document creative/documentary works of heritage value
+        - related_mappings includes prov:Entity (inscription reference as
+          data) and crm:E31_Document (documentary heritage concept)
+      class_uri: crm:E73_Information_Object
+      close_mappings:
+        - schema:CreativeWork
+      related_mappings:
+        - prov:Entity
+        - crm:E31_Document
       attributes:
         wikidata_id:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  locn: http://www.w3.org/ns/locn#
 
 imports:
   - linkml:types
@@ -21,7 +22,20 @@ default_range: string
 
 classes:
   MunicipalityInfo:
-      description: Municipality information
+      description: >-
+        Municipality information representing an administrative division
+        with name and code (e.g., CBS municipality code in the Netherlands).
+        
+        Ontology mapping rationale:
+        - class_uri is locn:AdminUnit because this represents an
+          administrative territorial unit (municipality level)
+        - close_mappings includes schema:AdministrativeArea for general admin areas
+        - related_mappings includes schema:Place for location aspects
+      class_uri: locn:AdminUnit
+      close_mappings:
+        - schema:AdministrativeArea
+      related_mappings:
+        - schema:Place
       attributes:
         name:
           range: string

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

@@ -22,7 +22,20 @@ default_range: string
 
 classes:
   MuseumRegisterEnrichment:
-      description: Dutch Museum Register (Museumregister Nederland) data
+      description: >-
+        Dutch Museum Register (Museumregister Nederland) data including
+        registration status, museum type, collection focus, and visitor statistics.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Entity because this represents enrichment data
+          derived from the Dutch Museum Register authority
+        - close_mappings includes schema:Museum for museum-specific semantics
+        - related_mappings includes prov:PrimarySource for authoritative registry
+      class_uri: prov:Entity
+      close_mappings:
+        - schema:Museum
+      related_mappings:
+        - prov:PrimarySource
       attributes:
         museum_name:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  pav: http://purl.org/pav/
 
 imports:
   - linkml:types
@@ -21,7 +22,20 @@ default_range: string
 
 classes:
   MuseumRegisterProvenance:
-      description: Provenance metadata for museum register enrichment
+      description: >-
+        Provenance metadata for museum register enrichment including source file,
+        URL, scrape timestamp, and page number in the registry.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Entity because this represents provenance metadata
+          about the museum register data source
+        - close_mappings includes pav:RetrievedFrom for web retrieval provenance
+        - related_mappings includes prov:PrimarySource for source registry
+      class_uri: prov:Entity
+      close_mappings:
+        - pav:RetrievedFrom
+      related_mappings:
+        - prov:PrimarySource
       attributes:
         source_file:
           range: string

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

@@ -24,7 +24,20 @@ default_range: string
 
 classes:
   NanIsilEnrichment:
-      description: Nationaal Archief ISIL registry match
+      description: >-
+        Nationaal Archief ISIL registry match containing ISIL codes, institution
+        names, assignment dates, and matching metadata from the Dutch National Archive.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Entity because this represents enrichment data
+          derived from the Nationaal Archief ISIL registry (authoritative source)
+        - close_mappings includes dcterms:Identifier for ISIL identifier semantics
+        - related_mappings includes prov:PrimarySource for authoritative registry
+      class_uri: prov:Entity
+      close_mappings:
+        - dcterms:Identifier
+      related_mappings:
+        - prov:PrimarySource
       attributes:
         source:
           range: string
@@ -73,10 +86,7 @@ classes:
           description: Remarks
         note:
           range: string
-          description: Additional note about this enrichment
-        note:
-          range: string
-          description: Additional notes about this enrichment (alternative key)
+          description: Additional notes about this enrichment
         nan_plaats:
           range: string
           description: City/place from Nationaal Archief

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  locn: http://www.w3.org/ns/locn#
+  geo: http://www.w3.org/2003/01/geo/wgs84_pos#
 
 imports:
   - linkml:types
@@ -23,7 +25,20 @@ default_range: string
 
 classes:
   NormalizedLocation:
-      description: Normalized geographic location
+      description: >-
+        Normalized geographic location with standardized address components,
+        coordinates, and GeoNames integration for consistent place identification.
+        
+        Ontology mapping rationale:
+        - class_uri is locn:Address because this represents a normalized,
+          structured geographic address with standardized components
+        - exact_mappings includes schema:Place as both represent physical locations
+        - close_mappings includes geo:SpatialThing for coordinate-based aspects
+      class_uri: locn:Address
+      exact_mappings:
+        - schema:Place
+      close_mappings:
+        - geo:SpatialThing
       attributes:
         latitude:
           range: float

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  time: http://www.w3.org/2006/time#
 
 imports:
   - linkml:types
@@ -22,7 +23,24 @@ default_range: string
 
 classes:
   OpeningHours:
-      description: Business opening hours
+      description: >-
+        Business opening hours for heritage institutions. Contains current
+        open/closed status, structured opening periods by day, and human-
+        readable weekday text descriptions.
+        
+        Ontology mapping rationale:
+        - class_uri is schema:OpeningHoursSpecification which is the
+          standard Schema.org type for structured opening hours
+        - close_mappings includes time:TemporalEntity from OWL-Time as
+          opening hours define temporal availability
+        - related_mappings includes prov:Entity (opening hours as data)
+          and schema:Place (opening hours belong to places)
+      class_uri: schema:OpeningHoursSpecification
+      close_mappings:
+        - time:TemporalEntity
+      related_mappings:
+        - prov:Entity
+        - schema:Place
       attributes:
         open_now:
           range: boolean

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  time: http://www.w3.org/2006/time#
 
 imports:
   - linkml:types
@@ -22,7 +23,20 @@ default_range: string
 
 classes:
   OpeningPeriod:
-      description: Single opening period
+      description: >-
+        Single opening period representing a time window when an institution is
+        accessible, defined by open and close TimeSlot values.
+        
+        Ontology mapping rationale:
+        - class_uri is schema:OpeningHoursSpecification because this class represents
+          structured opening hours data with open/close times
+        - exact_mappings includes time:Interval as both represent bounded time periods
+        - related_mappings includes schema:Schedule for broader scheduling context
+      class_uri: schema:OpeningHoursSpecification
+      exact_mappings:
+        - time:Interval
+      related_mappings:
+        - schema:Schedule
       attributes:
         open:
           range: TimeSlot

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  org: http://www.w3.org/ns/org#
 
 imports:
   - linkml:types
@@ -21,7 +22,24 @@ default_range: string
 
 classes:
   OrganizationalChange:
-      description: Organizational change record (closure, merger, etc.)
+      description: >-
+        Organizational change record documenting closures, mergers, renames,
+        and other lifecycle events. Includes change type, confirmation status,
+        source documentation, dates, and successor organization details.
+        
+        Ontology mapping rationale:
+        - class_uri is org:ChangeEvent from W3C Organization Ontology which
+          specifically models organizational change events
+        - close_mappings includes prov:Activity as changes are activities
+          that transform organizations over time
+        - related_mappings includes schema:Event (general event concept) and
+          prov:Entity (change record as traceable data)
+      class_uri: org:ChangeEvent
+      close_mappings:
+        - prov:Activity
+      related_mappings:
+        - schema:Event
+        - prov:Entity
       attributes:
         change_type:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  dcat: http://www.w3.org/ns/dcat#
 
 imports:
   - linkml:types
@@ -31,7 +32,23 @@ default_range: string
 
 classes:
   OriginalEntry:
-      description: Source registry data from NDE CSV or CH-Annotator
+      description: >-
+        Source registry data from NDE CSV or CH-Annotator extraction,
+        preserving original field names and values as imported from the
+        source system. This is the raw data before normalization.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:PrimarySource because original entries represent
+          authoritative source records before transformation.
+        - close_mappings includes dcat:Dataset as source entries form a
+          dataset of registry records.
+        - related_mappings includes prov:Entity for provenance tracking.
+      class_uri: prov:PrimarySource
+      close_mappings:
+        - dcat:Dataset
+      related_mappings:
+        - prov:Entity
+        - schema:DataCatalog
       attributes:
         unnamed_field:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  geo: http://www.w3.org/2003/01/geo/wgs84_pos#
 
 imports:
   - linkml:types
@@ -21,7 +22,22 @@ default_range: string
 
 classes:
   OriginalEntryCoordinates:
-      description: Coordinates from original source entry
+      description: >-
+        Geographic coordinates from an original source entry, supporting
+        both lat/lon and latitude/longitude field naming conventions.
+        
+        Ontology mapping rationale:
+        - class_uri is geo:Point from W3C WGS84 because coordinates
+          represent a geographic point.
+        - close_mappings includes schema:GeoCoordinates as the Schema.org
+          equivalent for coordinate data.
+        - related_mappings includes prov:Entity and geo:SpatialThing.
+      class_uri: geo:Point
+      close_mappings:
+        - schema:GeoCoordinates
+      related_mappings:
+        - prov:Entity
+        - geo:SpatialThing
       attributes:
         lat:
           range: float

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  dcterms: http://purl.org/dc/terms/
 
 imports:
   - linkml:types
@@ -21,7 +22,22 @@ default_range: string
 
 classes:
   OriginalEntryIdentifier:
-      description: Identifier from original source entry
+      description: >-
+        Identifier from an original source entry, supporting ISIL, Website,
+        Sigla, VIAF, GND, LCNAF and other identifier schemes.
+        
+        Ontology mapping rationale:
+        - class_uri is dcterms:Identifier because this represents a formal
+          identifier with scheme and value.
+        - close_mappings includes schema:PropertyValue as identifiers are
+          property-value pairs.
+        - related_mappings includes prov:Entity for provenance tracking.
+      class_uri: dcterms:Identifier
+      close_mappings:
+        - schema:PropertyValue
+      related_mappings:
+        - prov:Entity
+        - schema:identifier
       attributes:
         identifier_scheme:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  dcterms: http://purl.org/dc/terms/
 
 imports:
   - linkml:types
@@ -21,8 +22,24 @@ default_range: string
 
 classes:
   OriginalEntryIdentifiersDict:
-      description: Dictionary-format identifiers from original source (used by Palestinian
-        heritage extraction)
+      description: >-
+        Dictionary-format identifiers from original source, used by Palestinian
+        heritage extraction. Contains named identifier fields (VIAF, GND,
+        LCNAF, GeoNames, Wikidata, ISIL, Website) as direct properties.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Entity because the identifier collection is a
+          trackable entity containing multiple identifier values.
+        - close_mappings includes schema:PropertyValueSpecification as this
+          defines a structure of named identifier properties.
+        - related_mappings includes dcterms:Identifier for the individual
+          identifier semantics.
+      class_uri: prov:Entity
+      close_mappings:
+        - schema:PropertyValueSpecification
+      related_mappings:
+        - dcterms:Identifier
+        - schema:PropertyValue
       attributes:
         viaf:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  locn: http://www.w3.org/ns/locn#
 
 imports:
   - linkml:types
@@ -21,7 +22,22 @@ default_range: string
 
 classes:
   OriginalEntryLocation:
-      description: Location from original source entry
+      description: >-
+        Location from an original source entry including city, region, country,
+        postal code, street address, coordinates, and GeoNames ID.
+        
+        Ontology mapping rationale:
+        - class_uri is schema:Place because this represents a geographic
+          place with address and coordinate information.
+        - close_mappings includes locn:Address from W3C Locn vocabulary
+          for structured address information.
+        - related_mappings includes prov:Location and geo:SpatialThing.
+      class_uri: schema:Place
+      close_mappings:
+        - locn:Address
+      related_mappings:
+        - prov:Location
+        - geo:SpatialThing
       attributes:
         city:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  wikibase: http://wikiba.se/ontology#
 
 imports:
   - linkml:types
@@ -21,7 +22,22 @@ default_range: string
 
 classes:
   OriginalEntryWikidata:
-      description: Wikidata reference from original source
+      description: >-
+        Wikidata reference from an original source entry, including the
+        Q-number ID, URL, multilingual labels, and descriptions.
+        
+        Ontology mapping rationale:
+        - class_uri is wikibase:Item because this represents a reference
+          to a Wikidata item (Q-number entity).
+        - close_mappings includes schema:Thing as Wikidata items are
+          general entities with identifiers.
+        - related_mappings includes prov:Entity for tracking.
+      class_uri: wikibase:Item
+      close_mappings:
+        - schema:Thing
+      related_mappings:
+        - prov:Entity
+        - skos:Concept
       attributes:
         id:
           range: string

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  foaf: http://xmlns.com/foaf/0.1/
+  pico: https://personsincontext.org/model#
 
 imports:
   - linkml:types
@@ -25,7 +27,27 @@ default_range: string
 
 classes:
   PersonProfile:
-      description: Complete profile data for a person (heritage professional)
+      class_uri: foaf:PersonalProfileDocument
+      description: >-
+        Complete profile data for a person (heritage professional).
+        
+        foaf:PersonalProfileDocument - "A personal profile RDF document."
+        
+        This class represents a DOCUMENT containing profile information about a person,
+        not the person themselves. It captures structured data extracted from LinkedIn
+        profiles, staff pages, and other web sources about heritage professionals.
+        
+        Mapping rationale:
+        - Uses foaf:PersonalProfileDocument because this is a structured document ABOUT a person
+        - NOT foaf:Person/schema:Person - those represent the actual person entity
+        - Related to pico:PersonObservation which captures person data from historical sources
+      close_mappings:
+        - pico:PersonObservation  # Similar: person data from a source, but PiCo is for historical records
+        - schema:ProfilePage      # Similar: a web page serving as profile, but our class is data not page
+      related_mappings:
+        - foaf:Person             # The subject of this profile document
+        - schema:Person           # The subject of this profile document
+        - prov:Entity             # A profile is an entity with provenance
       attributes:
         exa_search_metadata:
           range: ExaSearchMetadata

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  dcterms: http://purl.org/dc/terms/
 
 imports:
   - linkml:types
@@ -21,7 +22,24 @@ default_range: string
 
 classes:
   PhotoAttribution:
-      description: Photo author attribution
+      description: >-
+        Photo author attribution containing display name, author URI,
+        and photo URI. Used for crediting photographers in Google Maps
+        and other image sources.
+        
+        Ontology mapping rationale:
+        - class_uri is schema:ImageObject because this class describes
+          image attribution which relates to image objects
+        - close_mappings includes dcterms:RightsStatement as attribution
+          is a form of rights/credit statement
+        - related_mappings includes prov:Attribution (provenance attribution)
+          and schema:Person (the attributed author)
+      class_uri: schema:ImageObject
+      close_mappings:
+        - dcterms:RightsStatement
+      related_mappings:
+        - prov:Attribution
+        - schema:Person
       attributes:
         displayName:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  pav: http://purl.org/pav/
 
 imports:
   - linkml:types
@@ -21,7 +22,20 @@ default_range: string
 
 classes:
   PlatformSourceReference:
-      description: Structured source reference for a digital platform
+      description: >-
+        Structured source reference for a digital platform including URL,
+        fetch timestamp, and list of data fields extracted from that source.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:PrimarySource because this represents a source
+          reference with provenance metadata for platform data extraction
+        - close_mappings includes pav:RetrievedFrom for web retrieval context
+        - related_mappings includes schema:WebPage for web platform references
+      class_uri: prov:PrimarySource
+      close_mappings:
+        - pav:RetrievedFrom
+      related_mappings:
+        - schema:WebPage
       attributes:
         url:
           range: uri

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  pico: https://w3id.org/pico/
+  foaf: http://xmlns.com/foaf/0.1/
 
 imports:
   - linkml:types
@@ -28,7 +30,26 @@ default_range: string
 
 classes:
   ProfileData:
-      description: Core profile information for a person
+      description: >-
+        Core profile information for a person, containing extracted biographical data
+        such as name, career history, education, skills, and professional summary.
+        This represents observed/extracted data ABOUT a person from a source document
+        (e.g., LinkedIn profile), not the person entity itself.
+        
+        Ontology mapping rationale:
+        - class_uri is pico:PersonObservation because this represents observed biographical
+          data extracted from a source, following the PiCo pattern of separating observations
+          from person reconstructions
+        - close_mappings includes foaf:PersonalProfileDocument as this is essentially
+          profile document content (though not RDF-specific)
+        - related_mappings includes schema:Person because the data describes a person,
+          and prov:Entity because the profile data participates in provenance chains
+      class_uri: pico:PersonObservation
+      close_mappings:
+        - foaf:PersonalProfileDocument
+      related_mappings:
+        - schema:Person
+        - prov:Entity
       attributes:
         full_name:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  pav: http://purl.org/pav/
 
 imports:
   - linkml:types
@@ -24,8 +25,25 @@ default_range: string
 
 classes:
   ProvenanceBlock:
-      description: Complete provenance tracking for the entry (supports both nested and
-        flat formats)
+      description: >-
+        Complete provenance tracking for the entry, supporting both nested and flat formats.
+        Contains information about data sources, extraction methods, timestamps, confidence
+        scores, and verification status. This is the primary class for documenting the
+        lineage and quality of data in custodian records.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Bundle because this represents a named set of provenance
+          descriptions bundled together - it's provenance ABOUT provenance/data
+        - close_mappings includes pav:Provenance conceptually as PAV's approach to
+          tracking authoring and versioning provenance
+        - related_mappings includes prov:Entity (the bundle is itself an entity) and
+          prov:Activity (extraction/enrichment are activities with timestamps)
+      class_uri: prov:Bundle
+      close_mappings:
+        - pav:Provenance
+      related_mappings:
+        - prov:Entity
+        - prov:Activity
       attributes:
         schema_version:
           range: string

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

@@ -23,7 +23,21 @@ default_range: string
 
 classes:
   ProvenanceSources:
-      description: Sources organized by type
+      description: >-
+        Sources organized by type, aggregating multiple source records from different
+        data providers (Google Maps, Wikidata, web archives, etc.) with data tier
+        classification (TIER_1 through TIER_4).
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Collection because this aggregates multiple provenance
+          sources into a typed collection structure
+        - close_mappings includes prov:Bundle as it groups related provenance records
+        - related_mappings includes schema:ItemList for list-based organization
+      class_uri: prov:Collection
+      close_mappings:
+        - prov:Bundle
+      related_mappings:
+        - schema:ItemList
       attributes:
         original_entry:
           range: SourceRecord

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  locn: http://www.w3.org/ns/locn#
 
 imports:
   - linkml:types
@@ -21,7 +22,24 @@ default_range: string
 
 classes:
   ProvinceInfo:
-      description: Province information
+      description: >-
+        Province/region administrative information containing name and
+        ISO 3166-2 subdivision code. Used for administrative region
+        identification in location resolution and GHCID generation.
+        
+        Ontology mapping rationale:
+        - class_uri is locn:AdminUnit from ISA Location Core Vocabulary
+          which specifically models administrative territorial units
+        - close_mappings includes schema:AdministrativeArea for web
+          semantics compatibility
+        - related_mappings includes prov:Entity (province info as data)
+          and schema:Place (provinces are geographic places)
+      class_uri: locn:AdminUnit
+      close_mappings:
+        - schema:AdministrativeArea
+      related_mappings:
+        - prov:Entity
+        - schema:Place
       attributes:
         name:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  pav: http://purl.org/pav/
 
 imports:
   - linkml:types
@@ -21,7 +22,22 @@ default_range: string
 
 classes:
   RawSource:
-      description: Raw source information for web enrichment
+      description: >-
+        Raw source information for web enrichment including URL, fetch timestamp,
+        HTTP status, content hash, and extracted highlights from search results.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:PrimarySource because this represents the original
+          source material fetched from the web with full provenance metadata
+        - close_mappings includes pav:RetrievedFrom for web retrieval provenance
+        - close_mappings includes schema:WebPage as it captures web page data
+        - related_mappings includes prov:Entity for general provenance entity
+      class_uri: prov:PrimarySource
+      close_mappings:
+        - pav:RetrievedFrom
+        - schema:WebPage
+      related_mappings:
+        - prov:Entity
       attributes:
         source_id:
           range: string

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

@@ -21,7 +21,20 @@ default_range: string
 
 classes:
   RelatedPlace:
-      description: A related place from Google Maps
+      description: >-
+        A related place from Google Maps representing nearby or associated
+        locations with ratings and review information.
+        
+        Ontology mapping rationale:
+        - class_uri is schema:Place because this represents a physical place
+          with associated review/rating metadata from Google Maps
+        - close_mappings includes schema:LocalBusiness for commercial place aspects
+        - related_mappings includes schema:Review for rating/review data
+      class_uri: schema:Place
+      close_mappings:
+        - schema:LocalBusiness
+      related_mappings:
+        - schema:Review
       attributes:
         name:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  cito: http://purl.org/spar/cito/
 
 imports:
   - linkml:types
@@ -22,7 +23,25 @@ default_range: string
 
 classes:
   ResearchSource:
-      description: A research source consulted during location resolution
+      description: >-
+        A research source consulted during location resolution or other
+        investigative processes. Records the type of source (Wikidata,
+        web archive, official documents), identifiers, URLs, and any
+        structured data obtained from consultation.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:PrimarySource because research sources are
+          primary sources of information consulted during resolution
+        - close_mappings includes cito:CitationAct as consulting a source
+          is similar to citing it for evidence
+        - related_mappings includes schema:CreativeWork (sources are works)
+          and prov:Entity (sources are traceable entities)
+      class_uri: prov:PrimarySource
+      close_mappings:
+        - cito:CitationAct
+      related_mappings:
+        - schema:CreativeWork
+        - prov:Entity
       attributes:
         type:
           range: string
@@ -37,9 +56,6 @@ classes:
         note:
           range: string
           description: Additional notes about this source
-        note:
-          range: string
-          description: Additional note about this source (singular alias for notes)
         id:
           range: string
           description: Identifier for the source (e.g., Wikidata Q-number)

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  geo: http://www.w3.org/2003/01/geo/wgs84_pos#
 
 imports:
   - linkml:types
@@ -21,7 +22,20 @@ default_range: string
 
 classes:
   SourceCoordinates:
-      description: Source of coordinates for resolution
+      description: >-
+        Source of coordinates for geographic resolution, combining latitude/longitude
+        values with the data source that provided them (e.g., google_maps, wikidata).
+        
+        Ontology mapping rationale:
+        - class_uri is geo:Point because this represents a geographic point with
+          lat/lon coordinates
+        - exact_mappings includes schema:GeoCoordinates as both represent coordinate pairs
+        - close_mappings includes prov:Location for provenance-aware location data
+      class_uri: geo:Point
+      exact_mappings:
+        - schema:GeoCoordinates
+      close_mappings:
+        - prov:Location
       attributes:
         latitude:
           range: float

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  pav: http://purl.org/pav/
 
 imports:
   - linkml:types
@@ -21,7 +22,20 @@ default_range: string
 
 classes:
   SourceProvenance:
-      description: Detailed provenance information about a source
+      description: >-
+        Detailed provenance information about a source including file location
+        metadata such as CSV row numbers, YAML array indices, and file paths.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Entity because this represents provenance metadata
+          about a source (the source as an entity with location details)
+        - close_mappings includes pav:SourceAccessedAt for source access provenance
+        - related_mappings includes schema:PropertyValue for structured metadata
+      class_uri: prov:Entity
+      close_mappings:
+        - pav:SourceAccessedAt
+      related_mappings:
+        - schema:PropertyValue
       attributes:
         csv_row_number:
           range: integer

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  pav: http://purl.org/pav/
+  dcat: http://www.w3.org/ns/dcat#
 
 imports:
   - linkml:types
@@ -22,7 +24,24 @@ default_range: string
 
 classes:
   SourceRecord:
-      description: Individual source record with claims
+      description: >-
+        Individual source record with claims, representing a data extraction from a specific
+        source (API, registry, web scrape, etc.). Contains metadata about the source type,
+        data tier, fetch timestamp, and extracted claims. Used to track provenance of
+        individual data points.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Entity because this represents a discrete data entity with
+          provenance (when fetched, from where, by what method)
+        - close_mappings includes dcat:Distribution as this is similar to a specific
+          manifestation/representation of data from a source
+        - related_mappings includes pav:retrievedFrom conceptually (the source was retrieved)
+          and prov:PrimarySource (the record may be from a primary source)
+      class_uri: prov:Entity
+      close_mappings:
+        - dcat:Distribution
+      related_mappings:
+        - prov:PrimarySource
       attributes:
         source_type:
           range: string

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  oa: http://www.w3.org/ns/oa#
+  dcterms: http://purl.org/dc/terms/
 
 imports:
   - linkml:types
@@ -21,7 +23,22 @@ default_range: string
 
 classes:
   SourceReference:
-      description: Structured source reference for a claim
+      description: >-
+        Structured source reference for a claim with text position information
+        including excerpts, character offsets, and relevance scores.
+        
+        Ontology mapping rationale:
+        - class_uri is oa:TextPositionSelector because this class specifies
+          exact text positions (char_start, char_end) within a source document
+        - close_mappings includes prov:PrimarySource as it references source material
+        - close_mappings includes dcterms:BibliographicResource for citation context
+        - related_mappings includes schema:Quotation for text excerpt functionality
+      class_uri: oa:TextPositionSelector
+      close_mappings:
+        - prov:PrimarySource
+        - dcterms:BibliographicResource
+      related_mappings:
+        - schema:Quotation
       attributes:
         source_id:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  foaf: http://xmlns.com/foaf/0.1/
 
 imports:
   - linkml:types
@@ -21,7 +22,24 @@ default_range: string
 
 classes:
   SourceStaffEntry:
-      description: Reference to original staff entry
+      description: >-
+        Reference to original staff entry from custodian staff parsing.
+        Contains staff identifier, name, academic degree, professional
+        headline, LinkedIn URL, and heritage relevance assessment.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Entity because this is a reference to source
+          data about staff, not the person themselves
+        - close_mappings includes foaf:Person as the entry describes
+          attributes of a person
+        - related_mappings includes schema:Person (person semantics) and
+          prov:PrimarySource (reference to original staff data)
+      class_uri: prov:Entity
+      close_mappings:
+        - foaf:Person
+      related_mappings:
+        - schema:Person
+        - prov:PrimarySource
       attributes:
         staff_id:
           range: string

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  time: http://www.w3.org/2006/time#
+  crm: http://www.cidoc-crm.org/cidoc-crm/
 
 imports:
   - linkml:types
@@ -22,7 +24,20 @@ default_range: string
 
 classes:
   TimeEntry:
-      description: Structured time entry from source data
+      description: >-
+        Structured time entry from source data representing a temporal point or marker
+        with an associated label and type classification.
+        
+        Ontology mapping rationale:
+        - class_uri is time:Instant because TimeEntry represents a single point in time
+          (a date or year) rather than a duration or interval
+        - close_mappings includes schema:DateTime as it represents structured temporal data
+        - related_mappings includes crm:E52_Time-Span for CIDOC-CRM alignment
+      class_uri: time:Instant
+      close_mappings:
+        - schema:DateTime
+      related_mappings:
+        - crm:E52_Time-Span
       attributes:
         label:
           any_of:

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  skos: http://www.w3.org/2004/02/skos/core#
+  time: http://www.w3.org/2006/time#
 
 imports:
   - linkml:types
@@ -21,7 +23,20 @@ default_range: string
 
 classes:
   TimeEntryType:
-      description: Type classification for time entry
+      description: >-
+        Type classification for time entry specifying the semantic role of a temporal
+        point (e.g., begin, end, founded, dissolved).
+        
+        Ontology mapping rationale:
+        - class_uri is skos:Concept because this represents a controlled vocabulary
+          term classifying the type/role of a time entry
+        - close_mappings includes time:TemporalEntity as it categorizes temporal concepts
+        - related_mappings includes schema:PropertyValue for structured type data
+      class_uri: skos:Concept
+      close_mappings:
+        - time:TemporalEntity
+      related_mappings:
+        - schema:PropertyValue
       attributes:
         label:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  time: http://www.w3.org/2006/time#
 
 imports:
   - linkml:types
@@ -21,7 +22,20 @@ default_range: string
 
 classes:
   TimeSlot:
-      description: Day and time specification
+      description: >-
+        Day and time specification representing a specific point within a weekly
+        schedule, consisting of day of week, hour, and minute.
+        
+        Ontology mapping rationale:
+        - class_uri is time:Instant because TimeSlot represents a specific moment
+          (day + hour + minute) within a recurring weekly pattern
+        - exact_mappings includes schema:Time as both represent time-of-day specifications
+        - related_mappings includes schema:OpeningHoursSpecification for schedule context
+      class_uri: time:Instant
+      exact_mappings:
+        - schema:Time
+      related_mappings:
+        - schema:OpeningHoursSpecification
       attributes:
         day:
           range: integer

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  time: http://www.w3.org/2006/time#
+  crm: http://www.cidoc-crm.org/cidoc-crm/
 
 imports:
   - linkml:types
@@ -21,7 +23,22 @@ default_range: string
 
 classes:
   TimespanBlock:
-      description: CRMsci E52 Time-Span temporal bounds
+      description: >-
+        CIDOC-CRM E52 Time-Span temporal bounds with four-point fuzzy temporal
+        representation (begin_of_the_begin, end_of_the_begin, begin_of_the_end,
+        end_of_the_end) to handle uncertain or approximate temporal boundaries.
+        
+        Ontology mapping rationale:
+        - class_uri is crm:E52_Time-Span because this class directly implements
+          the CIDOC-CRM fuzzy temporal bounds pattern for cultural heritage data
+        - exact_mappings includes time:ProperInterval as both represent durations
+          with explicit start and end bounds
+        - related_mappings includes schema:Schedule for general temporal structuring
+      class_uri: crm:E52_Time-Span
+      exact_mappings:
+        - time:ProperInterval
+      related_mappings:
+        - schema:Schedule
       attributes:
         begin_of_the_begin:
           range: datetime

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  crm: http://www.cidoc-crm.org/cidoc-crm/
 
 imports:
   - linkml:types
@@ -22,7 +23,24 @@ default_range: string
 
 classes:
   UnescoIchEnrichment:
-      description: UNESCO Intangible Cultural Heritage elements for country
+      description: >-
+        UNESCO Intangible Cultural Heritage (ICH) elements for a country.
+        Contains the country code, total element count, enrichment timestamp,
+        and list of individual ICH elements inscribed on UNESCO lists.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Entity because this is enrichment data extracted
+          from UNESCO ICH registry, not the heritage elements themselves
+        - close_mappings includes crm:E89_Propositional_Object as ICH
+          elements are conceptual/propositional cultural assets
+        - related_mappings includes schema:Dataset (collection of elements)
+          and prov:Collection (grouped provenance entities)
+      class_uri: prov:Entity
+      close_mappings:
+        - crm:E89_Propositional_Object
+      related_mappings:
+        - schema:Dataset
+        - prov:Collection
       attributes:
         country_code:
           range: string

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  shacl: http://www.w3.org/ns/shacl#
+  dqv: http://www.w3.org/ns/dqv#
 
 imports:
   - linkml:types
@@ -21,7 +23,24 @@ default_range: string
 
 classes:
   ValidationMetadata:
-      description: Metadata about claim validation
+      description: >-
+        Metadata about claim validation including model, convention,
+        timestamp, and results. Records the outcome of validating
+        extracted claims against quality criteria or schema constraints.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Activity because validation is an activity
+          that operates on entities and produces validation results
+        - close_mappings includes dqv:QualityMeasurement as validation
+          produces quality assessments of data
+        - related_mappings includes shacl:ValidationResult (SHACL validation
+          outputs) and prov:Entity (validation metadata is itself an entity)
+      class_uri: prov:Activity
+      close_mappings:
+        - dqv:QualityMeasurement
+      related_mappings:
+        - shacl:ValidationResult
+        - prov:Entity
       attributes:
         model:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  pav: http://purl.org/pav/
 
 imports:
   - linkml:types
@@ -28,7 +29,24 @@ default_range: string
 
 classes:
   WebEnrichment:
-      description: Web archive metadata
+      description: >-
+        Web archive metadata and enrichment data extracted from institutional websites.
+        This class captures web scraping results, archived pages, extracted claims,
+        domain registration info, and organizational status discovered through web research.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Entity because this represents enrichment DATA with provenance
+          (timestamps, methods, sources), not the institution or website itself
+        - close_mappings includes pav:SourceAccessedAt because this captures when/how
+          a web source was accessed and archived
+        - related_mappings includes schema:WebPage because the enrichment is derived from
+          web pages, though this class models the extracted data not the page itself
+      class_uri: prov:Entity
+      close_mappings:
+        - pav:SourceAccessedAt
+      related_mappings:
+        - schema:WebPage
+        - prov:Derivation
       attributes:
         web_archives:
           range: WebArchive

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  pav: http://purl.org/pav/
+  dcat: http://www.w3.org/ns/dcat#
 
 imports:
   - linkml:types
@@ -21,7 +23,24 @@ default_range: string
 
 classes:
   WebSource:
-      description: Web source used for profile compilation
+      description: >-
+        Web source used for profile compilation, representing a URL that was consulted
+        or accessed during data extraction. This class captures the reference to an
+        online resource (URL, title, access date) from which information was derived.
+        
+        Ontology mapping rationale:
+        - class_uri is dcat:Resource because this represents a web resource that provides
+          data, aligning with DCAT's concept of resources in a data context
+        - close_mappings includes pav:sourceAccessedAt conceptually (though that's a property,
+          not class) - this class models the same semantic: a source that was consulted
+        - related_mappings includes schema:WebPage as the source is typically a web page,
+          and prov:Entity because it participates in provenance chains
+      class_uri: dcat:Resource
+      close_mappings:
+        - schema:WebPage
+      related_mappings:
+        - prov:Entity
+        - schema:CreativeWork
       attributes:
         url:
           range: uri

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  http: http://www.w3.org/2011/http#
 
 imports:
   - linkml:types
@@ -21,7 +22,23 @@ default_range: string
 
 classes:
   WikidataApiMetadata:
-      description: API call metadata
+      description: >-
+        Metadata about Wikidata API calls including endpoint, timestamp,
+        authentication status, response metrics, and rate limiting information.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Activity because an API call is an activity that
+          retrieves data from Wikidata.
+        - close_mappings includes http:Request from W3C HTTP Vocabulary as
+          API calls are HTTP requests.
+        - related_mappings includes schema:Action as an API call is an action
+          with inputs and outputs.
+      class_uri: prov:Activity
+      close_mappings:
+        - http:Request
+      related_mappings:
+        - schema:Action
+        - prov:Entity
       attributes:
         has_or_had_api_endpoint:
           range: uri

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  crm: http://www.cidoc-crm.org/cidoc-crm/
 
 imports:
   - linkml:types
@@ -22,7 +23,24 @@ default_range: string
 
 classes:
   WikidataArchitecture:
-      description: Architecture-related Wikidata properties
+      description: >-
+        Architecture-related properties extracted from Wikidata including
+        architects (P84), architectural styles (P149), and structural
+        engineers (P631). Used for heritage buildings and cultural sites.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Entity because this is an extracted data bundle
+          about architectural attributes, not a building itself
+        - close_mappings includes crm:E22_Human-Made_Object as architectural
+          properties relate to designed physical structures
+        - related_mappings includes schema:Place (architecture relates to
+          places) and crm:E7_Activity (design/construction activities)
+      class_uri: prov:Entity
+      close_mappings:
+        - crm:E22_Human-Made_Object
+      related_mappings:
+        - schema:Place
+        - crm:E7_Activity
       attributes:
         has_or_had_architect:
           range: WikidataEntity

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  skos: http://www.w3.org/2004/02/skos/core#
+  wikibase: http://wikiba.se/ontology#
 
 imports:
   - linkml:types
@@ -22,7 +24,23 @@ default_range: string
 
 classes:
   WikidataClassification:
-      description: Classification properties
+      description: >-
+        Classification properties from Wikidata including instance_of (P31),
+        field_of_work (P101), heritage_designation (P1435), and main_subject (P921).
+        
+        Ontology mapping rationale:
+        - class_uri is skos:Concept because classification represents conceptual
+          categorization of entities.
+        - close_mappings includes wikibase:Statement as Wikidata classifications
+          are statements about entities.
+        - related_mappings includes prov:Entity as classifications are tracked
+          data entities.
+      class_uri: skos:Concept
+      close_mappings:
+        - wikibase:Statement
+      related_mappings:
+        - prov:Entity
+        - schema:CategoryCode
       attributes:
         instance_of:
           range: WikidataEntity

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  bf: http://id.loc.gov/ontologies/bibframe/
 
 imports:
   - linkml:types
@@ -21,7 +22,22 @@ default_range: string
 
 classes:
   WikidataCollectionInfo:
-      description: Collection information from Wikidata (flat structure)
+      description: >-
+        Collection information from Wikidata in a flat structure, capturing
+        collection item counts and related metrics.
+        
+        Ontology mapping rationale:
+        - class_uri is schema:Collection because this describes collection-level
+          information from Wikidata.
+        - close_mappings includes bf:Collection from BIBFRAME as an equivalent
+          bibliographic collection concept.
+        - related_mappings includes prov:Entity as collection info is tracked data.
+      class_uri: schema:Collection
+      close_mappings:
+        - bf:Collection
+      related_mappings:
+        - prov:Entity
+        - schema:QuantitativeValue
       attributes:
         collection_items_count:
           any_of:

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  vcard: http://www.w3.org/2006/vcard/ns#
 
 imports:
   - linkml:types
@@ -21,7 +22,24 @@ default_range: string
 
 classes:
   WikidataContact:
-      description: Contact information from Wikidata
+      description: >-
+        Contact information extracted from Wikidata including phone numbers
+        (P1329), email addresses (P968), and fax numbers (P2900). Supports
+        multiple values for phone and email fields.
+        
+        Ontology mapping rationale:
+        - class_uri is schema:ContactPoint because this class aggregates
+          contact details (phone, email, fax) as Schema.org defines
+        - close_mappings includes vcard:Contact from vCard ontology which
+          serves similar purpose for contact information modeling
+        - related_mappings includes prov:Entity (traceable contact data)
+          and schema:Organization (contact info typically belongs to orgs)
+      class_uri: schema:ContactPoint
+      close_mappings:
+        - vcard:Contact
+      related_mappings:
+        - prov:Entity
+        - schema:Organization
       attributes:
         phone_number:
           any_of:

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  geo: http://www.w3.org/2003/01/geo/wgs84_pos#
+  wikibase: http://wikiba.se/ontology#
 
 imports:
   - linkml:types
@@ -21,7 +23,24 @@ default_range: string
 
 classes:
   WikidataCoordinates:
-      description: Coordinates from Wikidata P625
+      description: >-
+        Coordinates from Wikidata P625 (coordinate location property).
+        Includes latitude, longitude, precision level, and reference globe.
+        Precision indicates the accuracy of coordinates (e.g., to nearest degree).
+        
+        Ontology mapping rationale:
+        - class_uri is geo:Point because coordinates represent a specific
+          point in WGS84 coordinate reference system
+        - close_mappings includes wikibase:GlobecoordinateValue which is
+          Wikidata's native coordinate value type
+        - related_mappings includes schema:GeoCoordinates (web semantics)
+          and prov:Entity (coordinates are traceable data)
+      class_uri: geo:Point
+      close_mappings:
+        - wikibase:GlobecoordinateValue
+      related_mappings:
+        - schema:GeoCoordinates
+        - prov:Entity
       attributes:
         latitude:
           range: float

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  wd: http://www.wikidata.org/entity/
 
 imports:
   - linkml:types
@@ -44,7 +45,25 @@ default_range: string
 
 classes:
   WikidataEnrichment:
-      description: Full Wikidata enrichment data
+      description: >-
+        Full Wikidata enrichment data extracted from Wikidata SPARQL/API for a heritage custodian.
+        This class represents derived data (prov:Entity) where Wikidata serves as the primary source.
+        The enrichment captures labels, descriptions, identifiers, coordinates, temporal data,
+        classification, and other structured claims from the Wikidata knowledge graph.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Entity because this represents enrichment DATA with provenance,
+          not the heritage institution itself (which is modeled by Custodian class)
+        - close_mappings includes prov:PrimarySource because Wikidata functions as a 
+          primary/authoritative source for linked open data
+        - related_mappings includes prov:Derivation because the enrichment is derived from
+          Wikidata through API queries
+      class_uri: prov:Entity
+      close_mappings:
+        - prov:PrimarySource
+      related_mappings:
+        - prov:Derivation
+        - wd:Q2013
       attributes:
         wikidata_entity_id:
           range: string

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  wikibase: http://wikiba.se/ontology#
+  wd: http://www.wikidata.org/entity/
 
 imports:
   - linkml:types
@@ -21,7 +23,23 @@ default_range: string
 
 classes:
   WikidataEntity:
-      description: Reference to a Wikidata entity
+      description: >-
+        Reference to a Wikidata entity (Q-item), including Q-number identifier,
+        multilingual labels (en/nl), descriptions, and instance_of classifications.
+        
+        Ontology mapping rationale:
+        - class_uri is wikibase:Item because this represents a Wikidata item
+          (Q-number entity) in the Wikibase data model.
+        - close_mappings includes schema:Thing as Wikidata items are general
+          things with identifiers and labels.
+        - related_mappings includes prov:Entity as Wikidata entities are
+          provenance-trackable.
+      class_uri: wikibase:Item
+      close_mappings:
+        - schema:Thing
+      related_mappings:
+        - prov:Entity
+        - skos:Concept
       attributes:
         id:
           range: string

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  geo: http://www.w3.org/2003/01/geo/wgs84_pos#
+  locn: http://www.w3.org/ns/locn#
 
 imports:
   - linkml:types
@@ -23,7 +25,24 @@ default_range: string
 
 classes:
   WikidataLocation:
-      description: Location properties from Wikidata
+      description: >-
+        Location properties extracted from Wikidata including country (P17),
+        headquarters location (P159), coordinates (P625), administrative
+        entity (P131), postal code (P281), and adjacent buildings (P3032).
+        
+        Ontology mapping rationale:
+        - class_uri is schema:Place because location properties describe
+          a geographic place.
+        - close_mappings includes locn:Address from W3C Locn as this captures
+          structured location information.
+        - related_mappings includes geo:SpatialThing for coordinate data
+          and prov:Location for provenance context.
+      class_uri: schema:Place
+      close_mappings:
+        - locn:Address
+      related_mappings:
+        - geo:SpatialThing
+        - prov:Location
       attributes:
         country_reference:
           any_of:

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  foaf: http://xmlns.com/foaf/0.1/
+  dcterms: http://purl.org/dc/terms/
 
 imports:
   - linkml:types
@@ -21,7 +23,23 @@ default_range: string
 
 classes:
   WikidataMedia:
-      description: Media files from Wikidata
+      description: >-
+        Media files from Wikidata including images (P18), logos (P154),
+        Commons categories (P373), galleries (P935), coat of arms (P94),
+        and flag images (P41).
+        
+        Ontology mapping rationale:
+        - class_uri is schema:MediaObject because this represents media
+          file references from Wikidata/Commons.
+        - close_mappings includes foaf:Image as many properties are images.
+        - related_mappings includes dcterms:MediaType for media classification
+          and prov:Entity as media references are tracked entities.
+      class_uri: schema:MediaObject
+      close_mappings:
+        - foaf:Image
+      related_mappings:
+        - dcterms:MediaType
+        - prov:Entity
       attributes:
         image:
           range: string

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  org: http://www.w3.org/ns/org#
+  wd: http://www.wikidata.org/entity/
 
 imports:
   - linkml:types
@@ -22,7 +24,23 @@ default_range: string
 
 classes:
   WikidataOrganization:
-      description: Organizational properties
+      description: >-
+        Organizational properties extracted from Wikidata, including
+        hierarchical relationships (part_of, parent_organization, subsidiary),
+        governance (chairperson, CEO), and membership affiliations.
+        
+        Ontology mapping rationale:
+        - class_uri is org:Organization because this class represents
+          organizational entity data from Wikidata aligned with W3C Org
+        - close_mappings includes schema:Organization for web semantics
+        - related_mappings includes prov:Entity (traceable data unit) and
+          wd:Q43229 (Wikidata's concept of organization)
+      class_uri: org:Organization
+      close_mappings:
+        - schema:Organization
+      related_mappings:
+        - prov:Entity
+        - wd:Q43229
       attributes:
         part_of:
           range: WikidataEntity

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  crm: http://www.cidoc-crm.org/cidoc-crm/
 
 imports:
   - linkml:types
@@ -22,7 +23,25 @@ default_range: string
 
 classes:
   WikidataRecognition:
-      description: Awards and recognition from Wikidata
+      description: >-
+        Awards and recognition information extracted from Wikidata,
+        particularly the award received property (P166). Used to track
+        honors, certifications, and formal recognition received by
+        heritage institutions.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Entity because this is extracted recognition
+          data, not the recognition/award event itself
+        - close_mappings includes schema:AggregateRating as recognition
+          data provides a form of institutional quality assessment
+        - related_mappings includes crm:E7_Activity (award ceremonies are
+          activities) and schema:Organization (awards are given to orgs)
+      class_uri: prov:Entity
+      close_mappings:
+        - schema:AggregateRating
+      related_mappings:
+        - crm:E7_Activity
+        - schema:Organization
       attributes:
         award_received:
           range: WikidataEntity

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  foaf: http://xmlns.com/foaf/0.1/
 
 imports:
   - linkml:types
@@ -21,7 +22,24 @@ default_range: string
 
 classes:
   WikidataSocialMedia:
-      description: Social media identifiers
+      description: >-
+        Social media identifiers and metrics extracted from Wikidata.
+        Includes platform-specific usernames/IDs for Instagram, LinkedIn,
+        Twitter/X, Facebook, YouTube, plus aggregate follower counts (P8687).
+        
+        Ontology mapping rationale:
+        - class_uri is foaf:OnlineAccount because social media profiles
+          are online accounts as defined by FOAF
+        - close_mappings includes schema:ProfilePage as social media
+          accounts manifest as profile pages
+        - related_mappings includes prov:Entity (traceable data) and
+          schema:Organization (social accounts belong to organizations)
+      class_uri: foaf:OnlineAccount
+      close_mappings:
+        - schema:ProfilePage
+      related_mappings:
+        - prov:Entity
+        - schema:Organization
       attributes:
         instagram_username:
           any_of:

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  time: http://www.w3.org/2006/time#
 
 imports:
   - linkml:types
@@ -21,7 +22,24 @@ default_range: string
 
 classes:
   WikidataTemporal:
-      description: Temporal properties from Wikidata
+      description: >-
+        Temporal properties extracted from Wikidata including inception (P571),
+        dissolution (P576), official opening (P1619), and activity time spans
+        (P580/P582). Captures key dates in organizational lifecycle.
+        
+        Ontology mapping rationale:
+        - class_uri is time:TemporalEntity from OWL-Time because this class
+          aggregates temporal properties defining existence/activity periods
+        - close_mappings includes prov:InstantaneousEvent as dates mark
+          discrete events in time (founding, dissolution, opening)
+        - related_mappings includes schema:Event (lifecycle events) and
+          prov:Entity (temporal data as traceable entity)
+      class_uri: time:TemporalEntity
+      close_mappings:
+        - prov:InstantaneousEvent
+      related_mappings:
+        - schema:Event
+        - prov:Entity
       attributes:
         inception:
           range: string

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

@@ -12,6 +12,8 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  wikibase: http://wikiba.se/ontology#
+  time: http://www.w3.org/2006/time#
 
 imports:
   - linkml:types
@@ -21,7 +23,24 @@ default_range: string
 
 classes:
   WikidataTimeValue:
-      description: Wikidata time value with precision metadata
+      description: >-
+        Wikidata time value with precision metadata. Records temporal
+        information in ISO 8601 format along with precision level
+        (9=year, 10=month, 11=day) and calendar model (typically Gregorian).
+        
+        Ontology mapping rationale:
+        - class_uri is wikibase:TimeValue because this directly represents
+          Wikidata's native time value datatype with precision
+        - close_mappings includes time:Instant from OWL-Time as both
+          represent points in time (though TimeValue adds precision)
+        - related_mappings includes xsd:dateTime (base type) and
+          prov:InstantaneousEvent (provenance temporal marker)
+      class_uri: wikibase:TimeValue
+      close_mappings:
+        - time:Instant
+      related_mappings:
+        - xsd:dateTime
+        - prov:InstantaneousEvent
       attributes:
         time:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  foaf: http://xmlns.com/foaf/0.1/
 
 imports:
   - linkml:types
@@ -21,7 +22,24 @@ default_range: string
 
 classes:
   WikidataWeb:
-      description: Web presence from Wikidata
+      description: >-
+        Web presence information extracted from Wikidata including official
+        website URLs (P856), description URLs (P973), and official blog URLs
+        (P1581). Supports multiple URLs per property.
+        
+        Ontology mapping rationale:
+        - class_uri is schema:WebSite because this class aggregates
+          web presence information (websites, blogs, description pages)
+        - close_mappings includes foaf:Document as web pages are documents
+          in the FOAF sense (information resources)
+        - related_mappings includes prov:Entity (traceable web data) and
+          schema:Organization (web presence belongs to organizations)
+      class_uri: schema:WebSite
+      close_mappings:
+        - foaf:Document
+      related_mappings:
+        - prov:Entity
+        - schema:Organization
       attributes:
         official_website:
           any_of:

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  foaf: http://xmlns.com/foaf/0.1/
 
 imports:
   - linkml:types
@@ -21,7 +22,23 @@ default_range: string
 
 classes:
   YoutubeChannel:
-      description: YouTube channel metadata
+      description: >-
+        YouTube channel metadata including channel ID, title, description,
+        subscriber/video/view counts, country code, and branding URLs.
+        
+        Ontology mapping rationale:
+        - class_uri is schema:BroadcastChannel because a YouTube channel is
+          a broadcast channel for video content distribution.
+        - close_mappings includes foaf:OnlineAccount as a channel represents
+          an online account on YouTube.
+        - related_mappings includes schema:Organization as channels often
+          represent institutional presence, and prov:Entity for tracking.
+      class_uri: schema:BroadcastChannel
+      close_mappings:
+        - foaf:OnlineAccount
+      related_mappings:
+        - schema:Organization
+        - prov:Entity
       attributes:
         channel_id:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  sioc: http://rdfs.org/sioc/ns#
 
 imports:
   - linkml:types
@@ -21,7 +22,22 @@ default_range: string
 
 classes:
   YoutubeComment:
-      description: YouTube video comment
+      description: >-
+        YouTube video comment including comment ID, author information,
+        text content, like count, and timestamps.
+        
+        Ontology mapping rationale:
+        - class_uri is schema:Comment because this represents user-generated
+          comment content on YouTube videos.
+        - close_mappings includes sioc:Post from SIOC (Semantically-Interlinked
+          Online Communities) as a comment is a type of online post.
+        - related_mappings includes prov:Entity for tracking comment provenance.
+      class_uri: schema:Comment
+      close_mappings:
+        - sioc:Post
+      related_mappings:
+        - prov:Entity
+        - schema:UserComments
       attributes:
         comment_id:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  dcat: http://www.w3.org/ns/dcat#
 
 imports:
   - linkml:types
@@ -27,8 +28,24 @@ default_range: string
 
 classes:
   YoutubeEnrichment:
-      description: YouTube channel and video data for the institution (supports both flat
-        and nested formats)
+      description: >-
+        YouTube channel and video data for a heritage institution, supporting
+        both flat and nested data formats. Includes channel metadata, videos,
+        social links, and LLM verification results.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Entity because YouTube enrichment data is a
+          provenance-tracked entity derived from YouTube API.
+        - close_mappings includes dcat:Dataset as the enrichment represents
+          a dataset of YouTube information.
+        - related_mappings includes schema:BroadcastChannel for the channel
+          aspect and prov:Collection for the video collection.
+      class_uri: prov:Entity
+      close_mappings:
+        - dcat:Dataset
+      related_mappings:
+        - schema:BroadcastChannel
+        - prov:Collection
       attributes:
         source_url:
           range: uri

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  pav: http://purl.org/pav/
 
 imports:
   - linkml:types
@@ -22,7 +23,22 @@ default_range: string
 
 classes:
   YoutubeProvenance:
-      description: Provenance information for YouTube enrichment
+      description: >-
+        Provenance information for YouTube enrichment including source URL,
+        extraction method, timestamp, and data quality tier.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:Entity because provenance metadata is itself a
+          trackable entity describing data origins.
+        - close_mappings includes pav:SourceAccessedAt to capture the access
+          point and timing of YouTube data retrieval.
+        - related_mappings includes prov:Activity as extraction is an activity.
+      class_uri: prov:Entity
+      close_mappings:
+        - pav:SourceAccessedAt
+      related_mappings:
+        - prov:Activity
+        - prov:Generation
       attributes:
         source_url:
           range: uri

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  foaf: http://xmlns.com/foaf/0.1/
 
 imports:
   - linkml:types
@@ -21,7 +22,23 @@ default_range: string
 
 classes:
   YoutubeSocialLink:
-      description: Social media link from YouTube channel
+      description: >-
+        Social media link from a YouTube channel's about page, linking to
+        external platforms like Website, Facebook, Twitter, Instagram, etc.
+        
+        Ontology mapping rationale:
+        - class_uri is schema:WebPage because a social link points to a
+          web page on another platform.
+        - close_mappings includes foaf:OnlineAccount as social links often
+          point to social media accounts.
+        - related_mappings includes prov:Entity for tracking and schema:URL
+          for the link structure.
+      class_uri: schema:WebPage
+      close_mappings:
+        - foaf:OnlineAccount
+      related_mappings:
+        - prov:Entity
+        - schema:URL
       attributes:
         platform:
           range: string

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

@@ -22,7 +22,22 @@ default_range: string
 
 classes:
   YoutubeSourceRecord:
-      description: YouTube source record for provenance tracking
+      description: >-
+        YouTube source record for provenance tracking, documenting API calls,
+        data tier, claims extracted, and any misattribution corrections.
+        
+        Ontology mapping rationale:
+        - class_uri is prov:PrimarySource because this represents a primary
+          source record from the YouTube Data API.
+        - close_mappings includes prov:Entity as source records are trackable
+          provenance entities.
+        - related_mappings includes prov:Revision for correction tracking.
+      class_uri: prov:PrimarySource
+      close_mappings:
+        - prov:Entity
+      related_mappings:
+        - prov:Revision
+        - prov:Activity
       attributes:
         source_type:
           range: string

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

@@ -12,6 +12,7 @@ prefixes:
   schema: http://schema.org/
   prov: http://www.w3.org/ns/prov#
   xsd: http://www.w3.org/2001/XMLSchema#
+  oa: http://www.w3.org/ns/oa#
 
 imports:
   - linkml:types
@@ -21,7 +22,23 @@ default_range: string
 
 classes:
   YoutubeTranscript:
-      description: YouTube video transcript
+      description: >-
+        YouTube video transcript including video ID, language, transcript type
+        (manual or auto-generated), full text, and extraction metadata.
+        
+        Ontology mapping rationale:
+        - class_uri is schema:Transcript because this represents a textual
+          transcript of video/audio content.
+        - close_mappings includes oa:TextualBody as the transcript text
+          forms annotation body content.
+        - related_mappings includes prov:Entity for tracking and schema:MediaObject
+          as transcripts derive from media.
+      class_uri: schema:Transcript
+      close_mappings:
+        - oa:TextualBody
+      related_mappings:
+        - prov:Entity
+        - schema:MediaObject
       attributes:
         video_id:
           range: string

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

@@ -23,7 +23,24 @@ default_range: string
 
 classes:
   YoutubeVideo:
-      description: Individual YouTube video metadata
+      description: >-
+        Individual YouTube video metadata including video ID, title, description,
+        view/like/comment counts, duration, thumbnail, tags, and associated
+        comments and transcripts.
+        
+        Ontology mapping rationale:
+        - class_uri is schema:VideoObject because this represents a video
+          as a media object on YouTube.
+        - close_mappings includes schema:MediaObject as the broader media
+          object category.
+        - related_mappings includes prov:Entity for provenance tracking and
+          schema:CreativeWork as videos are creative works.
+      class_uri: schema:VideoObject
+      close_mappings:
+        - schema:MediaObject
+      related_mappings:
+        - prov:Entity
+        - schema:CreativeWork
       attributes:
         video_id:
           range: string

frontend/src/App.tsx

@@ -187,6 +187,10 @@ const router = createBrowserRouter([
         path: 'conversation',
         element: withSuspense(ConversationPage),
       },
+      {
+        path: 'review',
+        element: withSuspense(EntityReviewPage),
+      },
     ],
   },
 ]);

frontend/src/components/layout/Navigation.tsx

@@ -395,7 +395,7 @@ export function Navigation() {
           {/* Settings Menu */}
           <div className="nav-dropdown">
             <button
-              className={`nav-dropdown-trigger ${isSubmenuActive(['/settings', '/roadmap']) ? 'active' : ''}`}
+              className={`nav-dropdown-trigger ${isSubmenuActive(['/settings', '/roadmap', '/review']) ? 'active' : ''}`}
               onClick={() => toggleDropdown('settings')}
               aria-expanded={openDropdown === 'settings'}
               aria-haspopup="true"
@@ -420,6 +420,9 @@ export function Navigation() {
                   {t('database')}
                   <span className="nav-external-icon" aria-hidden="true">↗</span>
                 </a>
+                <Link to="/review" className={`nav-dropdown-item ${isActive('/review') ? 'active' : ''}`}>
+                  {language === 'nl' ? 'Entity Review' : 'Entity Review'}
+                </Link>
               </div>
             )}
           </div>
@@ -564,6 +567,9 @@ export function Navigation() {
                 {t('database')}
                 <span className="nav-external-icon" aria-hidden="true">↗</span>
               </a>
+              <Link to="/review" className={`nav-mobile-link ${isActive('/review') ? 'active' : ''}`}>
+                {language === 'nl' ? 'Entity Review' : 'Entity Review'}
+              </Link>
             </div>
           </div>
 

frontend/src/components/ontology/OntologyTermPopup.css

@@ -0,0 +1,432 @@
+/**
+ * OntologyTermPopup.css
+ * 
+ * Styles for the ontology term popup shown when clicking on mapping tags
+ * in the LinkML viewer (e.g., rico:Rule, schema:name)
+ */
+
+.ontology-popup {
+  position: fixed;
+  width: 420px;
+  height: 350px;
+  max-height: calc(100vh - 100px);
+  background: white;
+  border-radius: 12px;
+  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15), 0 4px 12px rgba(0, 0, 0, 0.1);
+  z-index: 10200; /* Above SemanticDetailsPanel (10100) */
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+  border: 1px solid #e5e7eb;
+  transition: box-shadow 0.2s;
+}
+
+/* Dragging state */
+.ontology-popup--dragging {
+  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25), 0 8px 20px rgba(0, 0, 0, 0.15);
+  opacity: 0.95;
+}
+
+/* Minimized state */
+.ontology-popup--minimized {
+  height: auto !important;
+  max-height: 52px;
+  overflow: hidden;
+}
+
+.ontology-popup--minimized .ontology-popup__header {
+  border-bottom: none;
+}
+
+/* Header */
+.ontology-popup__header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 12px 16px;
+  background: linear-gradient(135deg, #0f766e 0%, #14b8a6 100%);
+  color: #ffffff;
+  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
+  cursor: grab;
+  flex-shrink: 0;
+}
+
+.ontology-popup--dragging .ontology-popup__header {
+  cursor: grabbing;
+}
+
+.ontology-popup__title {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  flex-wrap: wrap;
+  min-width: 0;
+}
+
+.ontology-popup__curie {
+  font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;
+  font-size: 14px;
+  font-weight: 600;
+  color: #ffffff;
+  background: rgba(255, 255, 255, 0.15);
+  padding: 3px 8px;
+  border-radius: 4px;
+}
+
+.ontology-popup__controls {
+  display: flex;
+  gap: 4px;
+  flex-shrink: 0;
+}
+
+.ontology-popup__minimize,
+.ontology-popup__close {
+  background: rgba(255, 255, 255, 0.1);
+  border: none;
+  color: white;
+  width: 28px;
+  height: 28px;
+  border-radius: 6px;
+  cursor: pointer;
+  font-size: 18px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  transition: background 0.2s;
+}
+
+.ontology-popup__minimize:hover,
+.ontology-popup__close:hover {
+  background: rgba(255, 255, 255, 0.2);
+}
+
+/* Badges */
+.ontology-popup__type-badge,
+.ontology-popup__ontology-badge {
+  display: inline-flex;
+  align-items: center;
+  padding: 2px 8px;
+  border-radius: 12px;
+  font-size: 10px;
+  font-weight: 600;
+  color: white;
+  text-transform: uppercase;
+  letter-spacing: 0.03em;
+  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
+}
+
+.ontology-popup__type-badge {
+  background: rgba(255, 255, 255, 0.2);
+}
+
+/* Content */
+.ontology-popup__content {
+  padding: 16px;
+  overflow-y: auto;
+  overscroll-behavior: contain;
+  flex: 1;
+}
+
+.ontology-popup__loading,
+.ontology-popup__error {
+  padding: 24px 16px;
+  text-align: center;
+  color: #64748b;
+}
+
+.ontology-popup__error {
+  color: #dc2626;
+  background: #fef2f2;
+  border-radius: 8px;
+  margin: 8px;
+}
+
+/* Sections */
+.ontology-popup__section {
+  margin-bottom: 14px;
+  padding-bottom: 14px;
+  border-bottom: 1px solid #f1f5f9;
+}
+
+.ontology-popup__section:last-child {
+  margin-bottom: 0;
+  padding-bottom: 0;
+  border-bottom: none;
+}
+
+.ontology-popup__section-label {
+  font-size: 11px;
+  font-weight: 600;
+  color: #64748b;
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+  display: block;
+  margin-bottom: 6px;
+}
+
+.ontology-popup__label-title {
+  margin: 0;
+  font-size: 18px;
+  font-weight: 600;
+  color: #172a59;
+}
+
+.ontology-popup__description {
+  margin: 0;
+  font-size: 13px;
+  line-height: 1.6;
+  color: #475569;
+}
+
+/* URI display */
+.ontology-popup__uri {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  flex-wrap: wrap;
+}
+
+.ontology-popup__uri-compact {
+  background: #f1f5f9;
+  padding: 4px 8px;
+  border-radius: 4px;
+  font-size: 12px;
+  color: #475569;
+  font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;
+  word-break: break-all;
+}
+
+.ontology-popup__uri-link {
+  font-size: 14px;
+  color: #14b8a6;
+  text-decoration: none;
+  padding: 2px 4px;
+  border-radius: 4px;
+  transition: background 0.2s;
+}
+
+.ontology-popup__uri-link:hover {
+  background: #f0fdfa;
+  text-decoration: none;
+}
+
+.ontology-popup__uri-list {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+}
+
+/* Aliases (Wikidata) */
+.ontology-popup__aliases {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 6px;
+}
+
+.ontology-popup__alias {
+  background: #f0fdf4;
+  color: #166534;
+  padding: 3px 8px;
+  border-radius: 4px;
+  font-size: 12px;
+  border: 1px solid #bbf7d0;
+}
+
+/* Property type badge */
+.ontology-popup__property-type {
+  display: inline-block;
+  background: #eff6ff;
+  color: #1e40af;
+  padding: 3px 8px;
+  border-radius: 4px;
+  font-size: 12px;
+  font-weight: 500;
+}
+
+/* Resize handles */
+.ontology-popup__resize {
+  position: absolute;
+  z-index: 10;
+}
+
+.ontology-popup__resize--n {
+  top: 0;
+  left: 8px;
+  right: 8px;
+  height: 6px;
+  cursor: n-resize;
+}
+
+.ontology-popup__resize--s {
+  bottom: 0;
+  left: 8px;
+  right: 8px;
+  height: 6px;
+  cursor: s-resize;
+}
+
+.ontology-popup__resize--e {
+  right: 0;
+  top: 8px;
+  bottom: 8px;
+  width: 6px;
+  cursor: e-resize;
+}
+
+.ontology-popup__resize--w {
+  left: 0;
+  top: 8px;
+  bottom: 8px;
+  width: 6px;
+  cursor: w-resize;
+}
+
+.ontology-popup__resize--ne {
+  top: 0;
+  right: 0;
+  width: 12px;
+  height: 12px;
+  cursor: ne-resize;
+}
+
+.ontology-popup__resize--nw {
+  top: 0;
+  left: 0;
+  width: 12px;
+  height: 12px;
+  cursor: nw-resize;
+}
+
+.ontology-popup__resize--se {
+  bottom: 0;
+  right: 0;
+  width: 12px;
+  height: 12px;
+  cursor: se-resize;
+}
+
+.ontology-popup__resize--sw {
+  bottom: 0;
+  left: 0;
+  width: 12px;
+  height: 12px;
+  cursor: sw-resize;
+}
+
+/* SE corner grip indicator */
+.ontology-popup__resize--se::after {
+  content: '';
+  position: absolute;
+  right: 3px;
+  bottom: 3px;
+  width: 8px;
+  height: 8px;
+  border-right: 2px solid #94a3b8;
+  border-bottom: 2px solid #94a3b8;
+  opacity: 0.5;
+  transition: opacity 0.2s;
+}
+
+.ontology-popup__resize--se:hover::after {
+  opacity: 1;
+}
+
+/* Dark mode */
+[data-theme="dark"] .ontology-popup {
+  background: #1e293b;
+  border-color: #334155;
+}
+
+[data-theme="dark"] .ontology-popup__header {
+  background: linear-gradient(135deg, #134e4a 0%, #0f766e 100%);
+}
+
+[data-theme="dark"] .ontology-popup__content {
+  background: #1e293b;
+}
+
+[data-theme="dark"] .ontology-popup__label-title {
+  color: #f1f5f9;
+}
+
+[data-theme="dark"] .ontology-popup__section {
+  border-bottom-color: #334155;
+}
+
+[data-theme="dark"] .ontology-popup__section-label {
+  color: #94a3b8;
+}
+
+[data-theme="dark"] .ontology-popup__description {
+  color: #cbd5e1;
+}
+
+[data-theme="dark"] .ontology-popup__uri-compact {
+  background: #334155;
+  color: #e2e8f0;
+}
+
+[data-theme="dark"] .ontology-popup__uri-link {
+  color: #2dd4bf;
+}
+
+[data-theme="dark"] .ontology-popup__uri-link:hover {
+  background: rgba(45, 212, 191, 0.1);
+}
+
+[data-theme="dark"] .ontology-popup__alias {
+  background: rgba(34, 197, 94, 0.15);
+  color: #86efac;
+  border-color: rgba(34, 197, 94, 0.3);
+}
+
+[data-theme="dark"] .ontology-popup__property-type {
+  background: rgba(59, 130, 246, 0.15);
+  color: #93c5fd;
+}
+
+[data-theme="dark"] .ontology-popup__error {
+  background: rgba(220, 38, 38, 0.15);
+  color: #fca5a5;
+}
+
+[data-theme="dark"] .ontology-popup__loading {
+  color: #94a3b8;
+}
+
+[data-theme="dark"] .ontology-popup__resize--se::after {
+  border-color: #64748b;
+}
+
+/* Responsive - Full screen on mobile */
+@media (max-width: 600px) {
+  .ontology-popup {
+    position: fixed !important;
+    top: 0 !important;
+    left: 0 !important;
+    right: 0 !important;
+    bottom: 0 !important;
+    width: 100% !important;
+    height: 100% !important;
+    max-height: 100vh !important;
+    border-radius: 0;
+  }
+
+  .ontology-popup__header {
+    cursor: default;
+  }
+
+  .ontology-popup__resize {
+    display: none;
+  }
+
+  .ontology-popup__minimize {
+    display: none;
+  }
+
+  .ontology-popup__close {
+    width: 40px;
+    height: 40px;
+    font-size: 24px;
+  }
+}

frontend/src/components/ontology/OntologyTermPopup.tsx

@@ -0,0 +1,806 @@
+/**
+ * OntologyTermPopup.tsx
+ * 
+ * A popup component that displays ontology term information when clicking on
+ * mapping tags (like `rico:Rule`, `schema:name`) in the LinkML viewer.
+ * 
+ * Features:
+ * - Draggable (drag from header)
+ * - Minimizable (collapse to title bar only)
+ * - Resizable (drag edges and corners)
+ * - Loads term definitions from local ontology files
+ * - Falls back to Wikidata API for wd: prefixed terms
+ */
+
+import React, { useEffect, useState, useRef, useCallback } from 'react';
+import { 
+  loadOntology, 
+  getOntologyFileByUri, 
+  getLocalName,
+} from '../../lib/ontology/ontology-loader';
+import { isTargetInsideAny } from '../../utils/dom';
+import './OntologyTermPopup.css';
+
+/**
+ * Standard prefix mappings for CURIE expansion
+ */
+const STANDARD_PREFIXES: Record<string, string> = {
+  // Top-level ontologies
+  'rdf': 'http://www.w3.org/1999/02/22-rdf-syntax-ns#',
+  'rdfs': 'http://www.w3.org/2000/01/rdf-schema#',
+  'owl': 'http://www.w3.org/2002/07/owl#',
+  'xsd': 'http://www.w3.org/2001/XMLSchema#',
+  'skos': 'http://www.w3.org/2004/02/skos/core#',
+  'foaf': 'http://xmlns.com/foaf/0.1/',
+  'prov': 'http://www.w3.org/ns/prov#',
+  'org': 'http://www.w3.org/ns/org#',
+  'dcat': 'http://www.w3.org/ns/dcat#',
+  
+  // Dublin Core
+  'dc': 'http://purl.org/dc/elements/1.1/',
+  'dcterms': 'http://purl.org/dc/terms/',
+  'dct': 'http://purl.org/dc/terms/',
+  
+  // Schema.org (support both http and https)
+  'schema': 'http://schema.org/',
+  
+  // Domain ontologies
+  'rico': 'https://www.ica.org/standards/RiC/ontology#',
+  'crm': 'http://www.cidoc-crm.org/cidoc-crm/',
+  'bf': 'http://id.loc.gov/ontologies/bibframe/',
+  'premis': 'http://www.loc.gov/premis/rdf/v3/',
+  'pico': 'https://pico.hypotheses.org/the-pico-ontology#',
+  'tooi': 'https://identifier.overheid.nl/tooi/def/ont/',
+  
+  // Application ontologies
+  'cpov': 'http://data.europa.eu/m8g/',
+  
+  // Utility ontologies
+  'geo': 'http://www.w3.org/2003/01/geo/wgs84_pos#',
+  'time': 'http://www.w3.org/2006/time#',
+  'vcard': 'http://www.w3.org/2006/vcard/ns#',
+  
+  // Wikidata
+  'wd': 'http://www.wikidata.org/entity/',
+  'wikidata': 'http://www.wikidata.org/entity/',
+  'wdt': 'http://www.wikidata.org/prop/direct/',
+  
+  // Project-specific
+  'linkml': 'https://w3id.org/linkml/',
+  'hc': 'https://w3id.org/heritage/custodian/',
+};
+
+interface OntologyTermPopupProps {
+  /** The CURIE or URI to look up (e.g., "rico:Rule", "schema:name") */
+  curie: string;
+  /** Called when user wants to close the popup */
+  onClose: () => void;
+  /** Initial position (optional, defaults to center) */
+  initialPosition?: { x: number; y: number };
+}
+
+interface Position {
+  x: number;
+  y: number;
+}
+
+interface Size {
+  width: number;
+  height: number;
+}
+
+type ResizeDirection = 'n' | 's' | 'e' | 'w' | 'ne' | 'nw' | 'se' | 'sw' | null;
+
+// Minimum panel dimensions
+const MIN_WIDTH = 300;
+const MIN_HEIGHT = 150;
+const DEFAULT_WIDTH = 420;
+const DEFAULT_HEIGHT = 350;
+
+/**
+ * Term information loaded from ontology
+ */
+interface TermInfo {
+  uri: string;
+  localName: string;
+  label: string;
+  description?: string;
+  comment?: string;
+  ontologyName: string;
+  termType: 'class' | 'property' | 'individual' | 'unknown';
+  // Class-specific
+  subClassOf?: string[];
+  equivalentClass?: string[];
+  // Property-specific
+  domain?: string[];
+  range?: string[];
+  propertyType?: 'object' | 'datatype' | 'annotation' | 'unknown';
+  subPropertyOf?: string[];
+  inverseOf?: string;
+  // Wikidata-specific
+  wikidataId?: string;
+  aliases?: string[];
+}
+
+/**
+ * Wikidata entity response structure
+ */
+interface WikidataEntity {
+  labels?: { en?: { value: string } };
+  descriptions?: { en?: { value: string } };
+  aliases?: { en?: Array<{ value: string }> };
+}
+
+/**
+ * Expand a CURIE to a full URI using standard prefixes
+ */
+function expandCurie(curie: string): string {
+  if (!curie) return curie;
+  
+  // Already a full URI
+  if (curie.startsWith('http://') || curie.startsWith('https://')) {
+    return curie;
+  }
+  
+  const colonIndex = curie.indexOf(':');
+  if (colonIndex > 0) {
+    const prefix = curie.substring(0, colonIndex);
+    const localName = curie.substring(colonIndex + 1);
+    const namespace = STANDARD_PREFIXES[prefix];
+    if (namespace) {
+      return namespace + localName;
+    }
+  }
+  
+  return curie;
+}
+
+/**
+ * Get the prefix from a CURIE
+ */
+function getPrefix(curie: string): string | undefined {
+  const colonIndex = curie.indexOf(':');
+  if (colonIndex > 0) {
+    return curie.substring(0, colonIndex);
+  }
+  return undefined;
+}
+
+/**
+ * Fetch Wikidata entity information
+ */
+async function fetchWikidataEntity(entityId: string): Promise<TermInfo | null> {
+  try {
+    // Remove wd: or wikidata: prefix if present
+    const id = entityId.replace(/^(wd:|wikidata:)/, '');
+    
+    const response = await fetch(
+      `https://www.wikidata.org/wiki/Special:EntityData/${id}.json`
+    );
+    
+    if (!response.ok) {
+      console.warn(`[OntologyTermPopup] Wikidata fetch failed for ${id}: ${response.status}`);
+      return null;
+    }
+    
+    const data = await response.json();
+    const entity = data.entities?.[id] as WikidataEntity;
+    
+    if (!entity) {
+      return null;
+    }
+    
+    return {
+      uri: `http://www.wikidata.org/entity/${id}`,
+      localName: id,
+      label: entity.labels?.en?.value || id,
+      description: entity.descriptions?.en?.value,
+      ontologyName: 'Wikidata',
+      termType: id.startsWith('P') ? 'property' : 'class',
+      wikidataId: id,
+      aliases: entity.aliases?.en?.map(a => a.value),
+    };
+  } catch (error) {
+    console.error('[OntologyTermPopup] Error fetching Wikidata entity:', error);
+    return null;
+  }
+}
+
+/**
+ * Load term information from ontology files or Wikidata
+ */
+async function loadTermInfo(curie: string): Promise<TermInfo | null> {
+  const prefix = getPrefix(curie);
+  
+  // Handle Wikidata terms
+  if (prefix === 'wd' || prefix === 'wikidata') {
+    return fetchWikidataEntity(curie);
+  }
+  
+  // Expand the CURIE to full URI
+  const fullUri = expandCurie(curie);
+  
+  // Find the ontology file that contains this URI
+  const ontologyFile = getOntologyFileByUri(fullUri);
+  
+  if (!ontologyFile) {
+    console.warn(`[OntologyTermPopup] No ontology file found for URI: ${fullUri}`);
+    // Return basic info
+    return {
+      uri: fullUri,
+      localName: getLocalName(fullUri) || curie,
+      label: getLocalName(fullUri) || curie,
+      ontologyName: 'Unknown',
+      termType: 'unknown',
+    };
+  }
+  
+  try {
+    // Load and parse the ontology
+    const ontology = await loadOntology(ontologyFile.path);
+    
+    // Search for the term in classes
+    const classMatch = ontology.classes.find(c => c.uri === fullUri);
+    if (classMatch) {
+      return {
+        uri: fullUri,
+        localName: getLocalName(fullUri) || curie,
+        label: classMatch.label || getLocalName(fullUri) || curie,
+        description: classMatch.description,
+        comment: classMatch.comment,
+        ontologyName: ontologyFile.name,
+        termType: 'class',
+        subClassOf: classMatch.subClassOf,
+        equivalentClass: classMatch.equivalentClass,
+      };
+    }
+    
+    // Search for the term in properties
+    const propMatch = ontology.properties.find(p => p.uri === fullUri);
+    if (propMatch) {
+      return {
+        uri: fullUri,
+        localName: getLocalName(fullUri) || curie,
+        label: propMatch.label || getLocalName(fullUri) || curie,
+        description: propMatch.description,
+        comment: propMatch.comment,
+        ontologyName: ontologyFile.name,
+        termType: 'property',
+        domain: propMatch.domain,
+        range: propMatch.range,
+        propertyType: propMatch.propertyType,
+        subPropertyOf: propMatch.subPropertyOf,
+        inverseOf: propMatch.inverseOf,
+      };
+    }
+    
+    // Search for the term in individuals
+    const indMatch = ontology.individuals.find(i => i.uri === fullUri);
+    if (indMatch) {
+      return {
+        uri: fullUri,
+        localName: getLocalName(fullUri) || curie,
+        label: indMatch.label || getLocalName(fullUri) || curie,
+        description: indMatch.description,
+        ontologyName: ontologyFile.name,
+        termType: 'individual',
+      };
+    }
+    
+    // Term not found in ontology, return basic info
+    console.warn(`[OntologyTermPopup] Term not found in ${ontologyFile.name}: ${fullUri}`);
+    return {
+      uri: fullUri,
+      localName: getLocalName(fullUri) || curie,
+      label: getLocalName(fullUri) || curie,
+      ontologyName: ontologyFile.name,
+      termType: 'unknown',
+      comment: `Term not found in ${ontologyFile.name} ontology file.`,
+    };
+    
+  } catch (error) {
+    console.error(`[OntologyTermPopup] Error loading ontology ${ontologyFile.path}:`, error);
+    return {
+      uri: fullUri,
+      localName: getLocalName(fullUri) || curie,
+      label: getLocalName(fullUri) || curie,
+      ontologyName: ontologyFile.name,
+      termType: 'unknown',
+      comment: `Error loading ontology: ${error}`,
+    };
+  }
+}
+
+/**
+ * Compact a full URI back to CURIE form if possible
+ */
+function compactUri(uri: string): string {
+  for (const [prefix, namespace] of Object.entries(STANDARD_PREFIXES)) {
+    if (uri.startsWith(namespace)) {
+      return `${prefix}:${uri.substring(namespace.length)}`;
+    }
+  }
+  return uri;
+}
+
+/**
+ * Ontology badge colors based on the ontology type
+ */
+const ONTOLOGY_COLORS: Record<string, string> = {
+  'CIDOC-CRM v7.1.3': '#8B5CF6',   // Purple
+  'RiC-O 1.1': '#EC4899',          // Pink
+  'Schema.org': '#F59E0B',         // Amber
+  'PROV-O': '#10B981',             // Green
+  'SKOS': '#F97316',               // Orange
+  'FOAF': '#6366F1',               // Indigo
+  'Dublin Core Terms': '#EF4444', // Red
+  'Dublin Core Elements': '#EF4444',
+  'ORG Ontology': '#8B5CF6',       // Purple
+  'DCAT 3': '#3B82F6',             // Blue
+  'CPOV (Core Public Org)': '#3B82F6',
+  'BIBFRAME': '#14B8A6',           // Teal
+  'TOOI': '#14B8A6',
+  'PiCo': '#0EA5E9',               // Sky
+  'Wikidata': '#339966',           // Wikidata green
+  'TIME': '#6B7280',               // Gray
+  'GEO': '#059669',                // Emerald
+  'VCard': '#7C3AED',              // Violet
+};
+
+export const OntologyTermPopup: React.FC<OntologyTermPopupProps> = ({
+  curie,
+  onClose,
+  initialPosition,
+}) => {
+  const [termInfo, setTermInfo] = useState<TermInfo | null>(null);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<string | null>(null);
+  
+  // Draggable state
+  const [position, setPosition] = useState<Position | null>(initialPosition || null);
+  const [isDragging, setIsDragging] = useState(false);
+  const dragStartRef = useRef<{ x: number; y: number; posX: number; posY: number } | null>(null);
+  const panelRef = useRef<HTMLDivElement>(null);
+  
+  // Minimized state
+  const [isMinimized, setIsMinimized] = useState(false);
+  
+  // Resize state
+  const [size, setSize] = useState<Size>({ width: DEFAULT_WIDTH, height: DEFAULT_HEIGHT });
+  const [isResizing, setIsResizing] = useState(false);
+  const [resizeDirection, setResizeDirection] = useState<ResizeDirection>(null);
+  const resizeStartRef = useRef<{ 
+    x: number; 
+    y: number; 
+    width: number; 
+    height: number;
+    posX: number;
+    posY: number;
+  } | null>(null);
+
+  // Load term information
+  useEffect(() => {
+    const loadInfo = async () => {
+      setLoading(true);
+      setError(null);
+      
+      try {
+        const info = await loadTermInfo(curie);
+        if (info) {
+          setTermInfo(info);
+        } else {
+          setError(`Could not find information for "${curie}"`);
+        }
+      } catch (err) {
+        console.error('[OntologyTermPopup] Error loading term info:', err);
+        setError(`Failed to load: ${err}`);
+      } finally {
+        setLoading(false);
+      }
+    };
+    
+    loadInfo();
+  }, [curie]);
+
+  // Center the popup on initial load if no position provided
+  useEffect(() => {
+    if (!initialPosition && panelRef.current && !position) {
+      const rect = panelRef.current.getBoundingClientRect();
+      setPosition({
+        x: (window.innerWidth - rect.width) / 2,
+        y: (window.innerHeight - rect.height) / 3,
+      });
+    }
+  }, [initialPosition, position]);
+
+  // Drag handlers
+  const handleMouseDown = useCallback((e: React.MouseEvent) => {
+    if (isTargetInsideAny(e.target, ['.ontology-popup__close', '.ontology-popup__minimize'])) {
+      return;
+    }
+    
+    e.preventDefault();
+    setIsDragging(true);
+    
+    const panel = panelRef.current;
+    if (panel) {
+      const rect = panel.getBoundingClientRect();
+      const currentX = position?.x ?? rect.left;
+      const currentY = position?.y ?? rect.top;
+      
+      dragStartRef.current = {
+        x: e.clientX,
+        y: e.clientY,
+        posX: currentX,
+        posY: currentY,
+      };
+    }
+  }, [position]);
+
+  const handleMouseMove = useCallback((e: MouseEvent) => {
+    if (!isDragging || !dragStartRef.current) return;
+    
+    const deltaX = e.clientX - dragStartRef.current.x;
+    const deltaY = e.clientY - dragStartRef.current.y;
+    
+    const newX = dragStartRef.current.posX + deltaX;
+    const newY = dragStartRef.current.posY + deltaY;
+    
+    const maxX = window.innerWidth - 100;
+    const maxY = window.innerHeight - 50;
+    
+    setPosition({
+      x: Math.max(0, Math.min(newX, maxX)),
+      y: Math.max(0, Math.min(newY, maxY)),
+    });
+  }, [isDragging]);
+
+  const handleMouseUp = useCallback(() => {
+    setIsDragging(false);
+    dragStartRef.current = null;
+  }, []);
+
+  // Add/remove global mouse event listeners for dragging
+  useEffect(() => {
+    if (isDragging) {
+      window.addEventListener('mousemove', handleMouseMove);
+      window.addEventListener('mouseup', handleMouseUp);
+      document.body.style.cursor = 'grabbing';
+      document.body.style.userSelect = 'none';
+    } else {
+      document.body.style.cursor = '';
+      document.body.style.userSelect = '';
+    }
+    
+    return () => {
+      window.removeEventListener('mousemove', handleMouseMove);
+      window.removeEventListener('mouseup', handleMouseUp);
+      document.body.style.cursor = '';
+      document.body.style.userSelect = '';
+    };
+  }, [isDragging, handleMouseMove, handleMouseUp]);
+
+  // Toggle minimize
+  const toggleMinimize = useCallback(() => {
+    setIsMinimized(prev => !prev);
+  }, []);
+
+  // Resize handlers
+  const handleResizeMouseDown = useCallback((direction: ResizeDirection) => (e: React.MouseEvent) => {
+    e.preventDefault();
+    e.stopPropagation();
+    
+    setIsResizing(true);
+    setResizeDirection(direction);
+    
+    const panel = panelRef.current;
+    if (panel) {
+      const rect = panel.getBoundingClientRect();
+      resizeStartRef.current = {
+        x: e.clientX,
+        y: e.clientY,
+        width: size.width,
+        height: size.height,
+        posX: position?.x ?? rect.left,
+        posY: position?.y ?? rect.top,
+      };
+    }
+  }, [size, position]);
+
+  const handleResizeMouseMove = useCallback((e: MouseEvent) => {
+    if (!isResizing || !resizeStartRef.current || !resizeDirection) return;
+    
+    const deltaX = e.clientX - resizeStartRef.current.x;
+    const deltaY = e.clientY - resizeStartRef.current.y;
+    
+    let newWidth = resizeStartRef.current.width;
+    let newHeight = resizeStartRef.current.height;
+    let newX = resizeStartRef.current.posX;
+    let newY = resizeStartRef.current.posY;
+    
+    if (resizeDirection.includes('e')) {
+      newWidth = Math.max(MIN_WIDTH, resizeStartRef.current.width + deltaX);
+    }
+    if (resizeDirection.includes('w')) {
+      const potentialWidth = resizeStartRef.current.width - deltaX;
+      if (potentialWidth >= MIN_WIDTH) {
+        newWidth = potentialWidth;
+        newX = resizeStartRef.current.posX + deltaX;
+      }
+    }
+    
+    if (resizeDirection.includes('s')) {
+      newHeight = Math.max(MIN_HEIGHT, resizeStartRef.current.height + deltaY);
+    }
+    if (resizeDirection.includes('n')) {
+      const potentialHeight = resizeStartRef.current.height - deltaY;
+      if (potentialHeight >= MIN_HEIGHT) {
+        newHeight = potentialHeight;
+        newY = resizeStartRef.current.posY + deltaY;
+      }
+    }
+    
+    setSize({ width: newWidth, height: newHeight });
+    
+    if (resizeDirection.includes('w') || resizeDirection.includes('n')) {
+      setPosition({ x: newX, y: newY });
+    }
+  }, [isResizing, resizeDirection]);
+
+  const handleResizeMouseUp = useCallback(() => {
+    setIsResizing(false);
+    setResizeDirection(null);
+    resizeStartRef.current = null;
+  }, []);
+
+  // Add/remove global mouse event listeners for resizing
+  useEffect(() => {
+    if (isResizing) {
+      window.addEventListener('mousemove', handleResizeMouseMove);
+      window.addEventListener('mouseup', handleResizeMouseUp);
+      document.body.style.userSelect = 'none';
+    }
+    
+    return () => {
+      window.removeEventListener('mousemove', handleResizeMouseMove);
+      window.removeEventListener('mouseup', handleResizeMouseUp);
+      if (!isDragging) {
+        document.body.style.userSelect = '';
+      }
+    };
+  }, [isResizing, handleResizeMouseMove, handleResizeMouseUp, isDragging]);
+
+  // Render URI as clickable link
+  const renderUri = (uri: string) => {
+    const compact = compactUri(uri);
+    return (
+      <span className="ontology-popup__uri">
+        <code className="ontology-popup__uri-compact">{compact}</code>
+        <a 
+          href={uri} 
+          target="_blank" 
+          rel="noopener noreferrer"
+          className="ontology-popup__uri-link"
+          title={uri}
+        >
+          ↗
+        </a>
+      </span>
+    );
+  };
+
+  // Render ontology badge
+  const renderOntologyBadge = (ontologyName: string) => {
+    const color = ONTOLOGY_COLORS[ontologyName] || '#64748B';
+    return (
+      <span 
+        className="ontology-popup__ontology-badge"
+        style={{ backgroundColor: color }}
+      >
+        {ontologyName}
+      </span>
+    );
+  };
+
+  // Render term type badge
+  const renderTypeBadge = (termType: string) => {
+    const colors: Record<string, string> = {
+      'class': '#3B82F6',
+      'property': '#10B981',
+      'individual': '#F59E0B',
+      'unknown': '#6B7280',
+    };
+    return (
+      <span 
+        className="ontology-popup__type-badge"
+        style={{ backgroundColor: colors[termType] || colors.unknown }}
+      >
+        {termType}
+      </span>
+    );
+  };
+
+  // Calculate panel style
+  const panelStyle: React.CSSProperties = {
+    width: size.width,
+    height: isMinimized ? 'auto' : size.height,
+    ...(position && {
+      position: 'fixed',
+      left: position.x,
+      top: position.y,
+    }),
+  };
+
+  return (
+    <div 
+      ref={panelRef}
+      className={`ontology-popup ${isMinimized ? 'ontology-popup--minimized' : ''} ${isDragging ? 'ontology-popup--dragging' : ''}`}
+      style={panelStyle}
+    >
+      {/* Header */}
+      <div 
+        className="ontology-popup__header"
+        onMouseDown={handleMouseDown}
+      >
+        <div className="ontology-popup__title">
+          <code className="ontology-popup__curie">{curie}</code>
+          {termInfo && (
+            <>
+              {renderTypeBadge(termInfo.termType)}
+              {renderOntologyBadge(termInfo.ontologyName)}
+            </>
+          )}
+        </div>
+        <div className="ontology-popup__controls">
+          <button 
+            className="ontology-popup__minimize"
+            onClick={toggleMinimize}
+            title={isMinimized ? 'Expand' : 'Minimize'}
+          >
+            {isMinimized ? '□' : '−'}
+          </button>
+          <button 
+            className="ontology-popup__close"
+            onClick={onClose}
+            title="Close"
+          >
+            ×
+          </button>
+        </div>
+      </div>
+      
+      {/* Content */}
+      {!isMinimized && (
+        <div className="ontology-popup__content">
+          {loading && (
+            <div className="ontology-popup__loading">
+              Loading term information...
+            </div>
+          )}
+          
+          {error && (
+            <div className="ontology-popup__error">
+              {error}
+            </div>
+          )}
+          
+          {!loading && !error && termInfo && (
+            <>
+              {/* Label */}
+              <div className="ontology-popup__section">
+                <h4 className="ontology-popup__label-title">{termInfo.label}</h4>
+              </div>
+              
+              {/* URI */}
+              <div className="ontology-popup__section">
+                <span className="ontology-popup__section-label">URI:</span>
+                {renderUri(termInfo.uri)}
+              </div>
+              
+              {/* Description / Comment */}
+              {(termInfo.description || termInfo.comment) && (
+                <div className="ontology-popup__section">
+                  <span className="ontology-popup__section-label">Description:</span>
+                  <p className="ontology-popup__description">
+                    {termInfo.description || termInfo.comment}
+                  </p>
+                </div>
+              )}
+              
+              {/* Wikidata aliases */}
+              {termInfo.aliases && termInfo.aliases.length > 0 && (
+                <div className="ontology-popup__section">
+                  <span className="ontology-popup__section-label">Also known as:</span>
+                  <div className="ontology-popup__aliases">
+                    {termInfo.aliases.map((alias, idx) => (
+                      <span key={idx} className="ontology-popup__alias">{alias}</span>
+                    ))}
+                  </div>
+                </div>
+              )}
+              
+              {/* Class-specific: subClassOf */}
+              {termInfo.subClassOf && termInfo.subClassOf.length > 0 && (
+                <div className="ontology-popup__section">
+                  <span className="ontology-popup__section-label">Subclass of:</span>
+                  <div className="ontology-popup__uri-list">
+                    {termInfo.subClassOf.map((uri, idx) => (
+                      <div key={idx}>{renderUri(uri)}</div>
+                    ))}
+                  </div>
+                </div>
+              )}
+              
+              {/* Property-specific: domain and range */}
+              {termInfo.domain && termInfo.domain.length > 0 && (
+                <div className="ontology-popup__section">
+                  <span className="ontology-popup__section-label">Domain:</span>
+                  <div className="ontology-popup__uri-list">
+                    {termInfo.domain.map((uri, idx) => (
+                      <div key={idx}>{renderUri(uri)}</div>
+                    ))}
+                  </div>
+                </div>
+              )}
+              
+              {termInfo.range && termInfo.range.length > 0 && (
+                <div className="ontology-popup__section">
+                  <span className="ontology-popup__section-label">Range:</span>
+                  <div className="ontology-popup__uri-list">
+                    {termInfo.range.map((uri, idx) => (
+                      <div key={idx}>{renderUri(uri)}</div>
+                    ))}
+                  </div>
+                </div>
+              )}
+              
+              {/* Property type */}
+              {termInfo.propertyType && termInfo.propertyType !== 'unknown' && (
+                <div className="ontology-popup__section">
+                  <span className="ontology-popup__section-label">Property type:</span>
+                  <span className="ontology-popup__property-type">{termInfo.propertyType}</span>
+                </div>
+              )}
+              
+              {/* Inverse property */}
+              {termInfo.inverseOf && (
+                <div className="ontology-popup__section">
+                  <span className="ontology-popup__section-label">Inverse of:</span>
+                  {renderUri(termInfo.inverseOf)}
+                </div>
+              )}
+              
+              {/* Sub-property */}
+              {termInfo.subPropertyOf && termInfo.subPropertyOf.length > 0 && (
+                <div className="ontology-popup__section">
+                  <span className="ontology-popup__section-label">Sub-property of:</span>
+                  <div className="ontology-popup__uri-list">
+                    {termInfo.subPropertyOf.map((uri, idx) => (
+                      <div key={idx}>{renderUri(uri)}</div>
+                    ))}
+                  </div>
+                </div>
+              )}
+            </>
+          )}
+        </div>
+      )}
+      
+      {/* Resize handles */}
+      {!isMinimized && (
+        <>
+          <div className="ontology-popup__resize ontology-popup__resize--n" onMouseDown={handleResizeMouseDown('n')} />
+          <div className="ontology-popup__resize ontology-popup__resize--s" onMouseDown={handleResizeMouseDown('s')} />
+          <div className="ontology-popup__resize ontology-popup__resize--e" onMouseDown={handleResizeMouseDown('e')} />
+          <div className="ontology-popup__resize ontology-popup__resize--w" onMouseDown={handleResizeMouseDown('w')} />
+          <div className="ontology-popup__resize ontology-popup__resize--ne" onMouseDown={handleResizeMouseDown('ne')} />
+          <div className="ontology-popup__resize ontology-popup__resize--nw" onMouseDown={handleResizeMouseDown('nw')} />
+          <div className="ontology-popup__resize ontology-popup__resize--se" onMouseDown={handleResizeMouseDown('se')} />
+          <div className="ontology-popup__resize ontology-popup__resize--sw" onMouseDown={handleResizeMouseDown('sw')} />
+        </>
+      )}
+    </div>
+  );
+};
+
+export default OntologyTermPopup;