# Ontology Mapping Rules for Heritage Custodian Project

**Version**: 1.0  
**Last Updated**: 2025-11-20  
**Purpose**: Define rigorous ontological mapping procedures for AI agents working on the GLAM heritage custodian data project

---

## Core Principle: Ontology-First Design

**CRITICAL**: The primary objective of this project is to create a **comprehensive, nuanced ontology** that can accurately represent the complex, temporal, multi-faceted nature of heritage custodian institutions worldwide.

### What This Means

- ✅ **DO**: Study ontology files deeply before creating classes or properties
- ✅ **DO**: Map Wikidata entities to formal ontology classes with explicit rationale
- ✅ **DO**: Model temporal independence of different aspects (place, custodian, legal form, collections, people)
- ✅ **DO**: Support multiple ontology classes for the same entity (CPOV + TOOI + Schema.org + CIDOC-CRM)
- ❌ **DON'T**: Use Wikidata Q-numbers directly as ontology classes
- ❌ **DON'T**: Create generic "HeritageCustodian" mappings without considering semantic aspects
- ❌ **DON'T**: Ignore temporal dimensions (everything changes over time!)

---

## Heritage-First Framing Principle

**CRITICAL FRAMING**: This project exclusively focuses on entities with **heritage significance**. All Wikidata entities in our taxonomy are evaluated through a heritage lens.

### Heritage Significance Default

When mapping Wikidata entities to ontology classes:

- ✅ **ALWAYS assume heritage significance** - We only include entities that are or could become heritage custodians
- ✅ **ALWAYS use heritage-focused ontology classes** - Prefer crm:E27_Site over generic schema:Place, prefer schema:LandmarksOrHistoricalBuildings over schema:Building
- ✅ **ALWAYS model place aspect for physical sites** - Buildings, monuments, landscapes in our taxonomy have heritage value
- ❌ **DON'T use generic real estate classes** - schema:Accommodation, schema:Residence are TOO GENERIC for our heritage focus
- ❌ **DON'T require "proof of heritage status"** - If an entity type is in our Wikidata extraction, it has heritage potential

### Examples

**Vacation Properties (Q3694)**
- ❌ WRONG: "Use schema:Accommodation as primary class because most vacation properties are commercial rentals"
- ✅ CORRECT: "Use crm:E27_Site as primary class because vacation properties in our taxonomy are HISTORIC VACATION PROPERTIES (royal summer palaces, historic villas) with documented heritage significance"

**Mansions (Q1802963)**
- ❌ WRONG: "Use schema:Residence because mansions are residential buildings"
- ✅ CORRECT: "Use crm:E27_Site + schema:LandmarksOrHistoricalBuildings because mansions in our taxonomy are HERITAGE BUILDINGS with architectural significance"

**Buitenplaatsen (Q2927789)**
- ❌ WRONG: "Use schema:House because buitenplaatsen are country houses"
- ✅ CORRECT: "Use crm:E27_Site because buitenplaatsen are HISTORIC ESTATES, many with Rijksmonument status and heritage protection"

### Ontology Selection Decision Tree for Physical Sites

```
Is the entity a physical place/building/site?
  ↓ YES
Is it in our GLAMORCUBESFIXPHDNT taxonomy?
  ↓ YES
THEN it has heritage significance
  ↓
PRIMARY CLASS: crm:E27_Site (CIDOC-CRM heritage site)
SECONDARY CLASS: schema:LandmarksOrHistoricalBuildings (Schema.org)
TERTIARY CLASS: dbo:HistoricPlace OR dbo:HistoricBuilding (DBpedia)
  ↓
NEVER USE: schema:Accommodation, schema:Residence, schema:Building (too generic)
```

### Rationale

1. **Taxonomy Scope**: Our Wikidata extraction targets GLAM entities - by definition, these have heritage significance
2. **Project Mission**: We model heritage custodians, not generic real estate
3. **Ontology Precision**: Heritage-specific classes (crm:E27_Site) provide richer semantics than generic classes
4. **Data Quality**: Using heritage classes signals to consumers that these are culturally significant entities
5. **Interoperability**: CIDOC-CRM is the STANDARD for cultural heritage - we must use it for heritage sites

---

## Rule 1: Ontology Files Are Source of Truth

**All ontology design MUST reference base ontologies in `/data/ontology/`.**

### Available Ontologies

| Ontology | File | Scope | When to Use |
|----------|------|-------|-------------|
| **CPOV** | `core-public-organisation-ap.ttl` | EU public sector | Government archives, state museums, public cultural institutions |
| **TOOI** | `tooiont.ttl` | Dutch government | Netherlands government heritage organizations |
| **Schema.org** | `schemaorg.owl` | Web semantics | Private collections, web discoverability, general fallback |
| **CIDOC-CRM** | `CIDOC_CRM_v7.1.3.rdf` | Cultural heritage domain | Museums, sites, curated holdings, provenance |
| **RiC-O** | `RiC-O_1-1.rdf` | Archival description | Archives, record sets, corporate bodies |
| **BIBFRAME** | `bibframe_vocabulary.rdf` | Bibliographic resources | Libraries, bibliographic collections |
| **PiCo** | `pico.ttl` | Person observations | Staff, curators, archivists, directors |
| **W3C Org** | (embedded in CPOV) | Organizational structure | Legal forms, organizational units |

### Mandatory Ontology Consultation Workflow

**Before designing any LinkML class, agents MUST:**

1. **Identify the semantic domain** (cultural, archival, educational, legal, etc.)
2. **Read relevant ontology files** using `read` or `grep` tools
3. **Extract applicable classes and properties**
4. **Document ontology alignment** in design notes
5. **Map Wikidata hypernyms to ontology classes** (not vice versa!)

**Example Workflow**:

```bash
# Step 1: Identify domain
# Entity: "mansion" (building + potential heritage custodian)

# Step 2: Search CIDOC-CRM for site/building classes
rg "E27_Site|E53_Place" /Users/kempersc/apps/glam/data/ontology/CIDOC_CRM_v7.1.3.rdf

# Step 3: Search Schema.org for building types
rg "LandmarksOrHistoricalBuildings|TouristAttraction" /Users/kempersc/apps/glam/data/ontology/schemaorg.owl

# Step 4: Search CPOV for organization classes (if mansion operates as museum)
rg "PublicOrganisation|classification" /Users/kempersc/apps/glam/data/ontology/core-public-organisation-ap.ttl

# Step 5: Document findings in design notes
# "Mansion should map to crm:E27_Site (place aspect) AND 
#  cpov:PublicOrganisation (custodian aspect if operates as museum)"
```

---

## Rule 2: Never Use Wikidata Entities Directly

**Wikidata Q-numbers are NOT ontology classes. They are ENTITY IDENTIFIERS.**

### Incorrect Approach ❌

```yaml
# BAD - Wikidata Q-number used as class
HeritageCustodian:
  class_uri: wd:Q1802963  # ← This is an INSTANCE (mansion), not a CLASS!
```

### Correct Approach ✅

```yaml
# GOOD - Wikidata entity mapped to formal ontology classes
Mansion:
  description: >-
    Large residential building, often with heritage significance.
    Wikidata reference: Q1802963
  
  # Place aspect
  place_class_uri: crm:E27_Site
  place_secondary_uri: schema:LandmarksOrHistoricalBuildings
  
  # Custodian aspect (if operates as heritage institution)
  custodian_class_uri: cpov:PublicOrganisation  # If public
  custodian_alt_uri: schema:Museum  # If private
  
  # Collections aspect
  collections_class_uri: crm:E78_Curated_Holding
```

### Wikidata Hypernym Files Purpose

The files `/schemas/hyponyms_curated.yaml` and `/schemas/hyponyms_curated_full.yaml` are:

- ✅ **Source data** for identifying heritage entity TYPES
- ✅ **Analysis input** for understanding domain taxonomy
- ✅ **Reference** for multilingual labels and descriptions
- ❌ **NOT** direct ontology class definitions

**Required Mapping Workflow**:

```
hyponyms_curated.yaml (Wikidata entities)
    ↓
ANALYZE semantic properties
    ↓
SEARCH base ontologies for appropriate classes
    ↓
MAP Wikidata entity to ontology class(es)
    ↓
DOCUMENT rationale and properties
    ↓
CREATE LinkML schema with ontology class_uri
```

---

## Rule 3: Multi-Aspect Modeling is Mandatory

**Every heritage entity has MULTIPLE ontological aspects with INDEPENDENT temporal lifecycles.**

### Required Aspects

All heritage custodian entities MUST model these aspects:

1. **Place Aspect** (physical location/site)
   - Ontology: CIDOC-CRM (E27_Site, E53_Place) + Schema.org (Place)
   - Temporal: Construction → Demolition/Present
   - Properties: Address, coordinates, building type, heritage designation

2. **Custodian Aspect** (organization managing heritage)
   - Ontology: CPOV (public) OR Schema.org (private) + CIDOC-CRM (E39_Actor)
   - Temporal: Founding → Dissolution/Present
   - Properties: Legal identifiers, organizational structure, mission

3. **Legal Form Aspect** (legal entity registration)
   - Ontology: W3C Org (FormalOrganization) + TOOI (Dutch)
   - Temporal: Registration → Deregistration/Present
   - Properties: KvK number, legal classification, registered address

4. **Collections Aspect** (heritage materials preserved)
   - Ontology: RiC-O (archival) OR CIDOC-CRM (museum) OR BIBFRAME (library)
   - Temporal: Accession → Deaccession (per item/collection)
   - Properties: Provenance, extent, access restrictions

5. **People Aspect** (staff/curators)
   - Ontology: PiCo (PersonObservation) + CIDOC-CRM (E21_Person)
   - Temporal: Employment start → Employment end (per person)
   - Properties: Roles, activities, employment records

6. **Temporal Events** (organizational changes)
   - Ontology: CIDOC-CRM (E10_Transfer_of_Custody, E8_Acquisition) + RiC-O (Event)
   - Properties: Custody transfers, mergers, relocations, transformations

### Example: Modeling a Historic Mansion Operating as Museum

```yaml
# Entity: Villa Mondriaan (Winterswijk, Netherlands)

# PLACE ASPECT
villa_mondriaan_place:
  aspect_type: place
  class_uri: crm:E27_Site
  secondary_class_uri: schema:LandmarksOrHistoricalBuildings
  temporal_extent:
    construction_date: "1880-01-01"
    current_status: standing
  properties:
    address: "Zonnebrink 4, 7101 NP Winterswijk"
    coordinates: [51.9711, 6.7197]
    heritage_designation: "Rijksmonument"

# CUSTODIAN ASPECT
stichting_villa_mondriaan:
  aspect_type: custodian
  class_uri: cpov:PublicOrganisation  # Dutch foundation with public benefit
  secondary_class_uri: schema:Museum
  temporal_extent:
    founding_date: "1994-05-12"
    current_status: active
  properties:
    legal_name: "Stichting Villa Mondriaan"
    isil_code: "NL-WtVM"
    manages: [villa_mondriaan_collections]

# LEGAL FORM ASPECT
stichting_legal_entity:
  aspect_type: legal_form
  class_uri: org:FormalOrganization
  mixin_class_uri: tooi:Overheidsorganisatie  # Dutch government org
  temporal_extent:
    registration_date: "1994-05-12"
    current_status: registered
  properties:
    kvk_number: "12345678"
    legal_form: "stichting"  # Dutch foundation

# COLLECTIONS ASPECT
villa_mondriaan_collections:
  aspect_type: collections
  class_uri: crm:E78_Curated_Holding
  archival_class_uri: rico:RecordSet
  temporal_extent:
    accession_start: "1994-01-01"
    current_status: growing
  properties:
    provenance: "Mondriaan family"
    extent: "500 objects, 200 archival documents"

# PEOPLE ASPECT
curator_maria_van_der_berg:
  aspect_type: person
  class_uri: pico:PersonObservation
  secondary_class_uri: crm:E21_Person
  temporal_extent:
    employment_start: "2020-01-01"
    current_status: employed
  properties:
    role: picot_roles:curator
    works_for: stichting_villa_mondriaan
```

---

## Rule 4: Temporal Independence Documentation

**All aspects have SEPARATE temporal lifecycles. Document this explicitly.**

### Required Temporal Properties

Every aspect MUST include:

```yaml
temporal_extent:
  start_date: "YYYY-MM-DD"  # When this aspect began
  end_date: "YYYY-MM-DD" or null  # When aspect ended (null = ongoing)
  certainty: "certain" | "approximate" | "inferred"
  source: "archival_record" | "legal_registration" | "oral_history" | etc.
```

### Example: Temporal Independence in Custody Transfer

```yaml
# Heineken corporate archive custody transfer (2005)

# BEFORE TRANSFER (1864-2005)
heineken_corporate_archive:
  custodian_aspect:
    custodian_id: heineken_nv
    class_uri: schema:Corporation
    temporal_extent:
      start_date: "1864-01-01"  # Heineken founded
      end_date: "2005-06-15"    # Custody transferred
  
  collections_aspect:
    class_uri: rico:RecordSet
    provenance: "Heineken N.V."
    temporal_extent:
      start_date: "1864-01-01"
      end_date: null  # Collection still exists (just moved)

# AFTER TRANSFER (2005-present)
heineken_archive_at_stadsarchief:
  custodian_aspect:
    custodian_id: stadsarchief_amsterdam
    class_uri: cpov:PublicOrganisation
    temporal_extent:
      start_date: "2005-06-15"  # Custody received
      end_date: null  # Ongoing
  
  collections_aspect:
    class_uri: rico:RecordSet
    provenance: "Heineken N.V."  # ← Provenance unchanged!
    temporal_extent:
      start_date: "1864-01-01"  # ← Collection dates unchanged!
      end_date: null

# CUSTODY TRANSFER EVENT
custody_transfer_event:
  event_type: crm:E10_Transfer_of_Custody
  class_uri: rico:Event
  temporal_extent:
    event_date: "2005-06-15"
  properties:
    surrendered_by: heineken_nv
    received_by: stadsarchief_amsterdam
    transferred_object: heineken_corporate_archive
```

---

## Rule 5: Ontology Properties Must Be Researched

**Never invent custom properties when ontology equivalents exist.**

### Property Research Workflow

1. **Identify the relationship** you need to express
2. **Search base ontologies** for existing properties
3. **Use ontology property** with proper namespace
4. **Document property source** in comments

**Example**:

```yaml
# ❌ WRONG - Custom property invented
institution:
  official_name: "Rijksarchief in Noord-Holland"

# ✅ CORRECT - CPOV ontology property used
institution:
  skos:prefLabel: "Rijksarchief in Noord-Holland"@nl
  # Source: CPOV uses SKOS for preferred labels
```

### Common Property Mappings

| Need | Ontology Property | Namespace |
|------|-------------------|-----------|
| Preferred name | `skos:prefLabel` | SKOS (used by CPOV) |
| Alternative names | `skos:altLabel` | SKOS |
| Identifiers | `dct:identifier` | Dublin Core Terms |
| Address | `locn:address` | W3C Location Core |
| Coordinates | `schema:geo` | Schema.org |
| Founding date | `schema:foundingDate` OR `tooi:begindatum` | Schema.org / TOOI |
| Organizational unit | `cpov:hasUnit` OR `org:hasUnit` | CPOV / W3C Org |
| Curated collection | `crm:P147_curated` | CIDOC-CRM |
| Archival holdings | `rico:isOrWasHolderOf` | RiC-O |
| Person role | `pico:hasRole` | PiCo |
| Provenance | `rico:hasProvenance` OR `prov:hadPrimarySource` | RiC-O / PROV-O |

---

## Rule 6: Decision Trees for Ontology Selection

**Use structured decision trees to select appropriate ontologies.**

### Decision Tree: Primary Ontology Class

```
START: Heritage entity identified
  ↓
Is it a physical place/site?
  ├─ YES → PRIMARY: crm:E27_Site + schema:Place
  │         Continue to check if also a custodian organization ↓
  │
  └─ NO → Is it an organization?
           ├─ YES → Is it public sector?
           │         ├─ YES → cpov:PublicOrganisation
           │         │         Is it Dutch government?
           │         │           ├─ YES → ADD MIXIN: tooi:Overheidsorganisatie
           │         │           └─ NO → CPOV only
           │         │
           │         └─ NO → schema:Organization
           │                  What type?
           │                    ├─ Museum → schema:Museum
           │                    ├─ Library → schema:Library
           │                    ├─ Archive → schema:ArchiveOrganization
           │                    ├─ Education → schema:EducationalOrganization
           │                    └─ NGO → schema:NGO
           │
           └─ NO → Is it a collection?
                    ├─ Archival → rico:RecordSet
                    ├─ Museum → crm:E78_Curated_Holding
                    ├─ Library → bf:Collection
                    └─ Mixed → Use multiple classes
```

### Decision Tree: Dutch vs. EU vs. Global

```
START: Determine geographic/legal scope
  ↓
Country == "Netherlands"?
  ├─ YES → Legal status == "public"?
  │         ├─ YES → USE: tooi:Overheidsorganisatie (Dutch government)
  │         │         ALSO ADD: cpov:PublicOrganisation (EU compliance)
  │         │
  │         └─ NO → USE: schema:Organization (private)
  │                  ADD: DutchLegalEntityMixin (KvK numbers)
  │
  └─ NO → In Europe?
           ├─ YES → Legal status == "public"?
           │         ├─ YES → USE: cpov:PublicOrganisation
           │         └─ NO → USE: schema:Organization
           │
           └─ NO → USE: schema:Organization (global)
                    ADD domain-specific class:
                      - schema:Museum
                      - schema:ArchiveOrganization
                      - schema:Library
```

---

## Rule 7: Documentation Requirements

**All ontology mappings MUST be documented with rationale.**

### Required Documentation Fields

```yaml
ontology_mapping:
  wikidata_source: Q1802963  # Wikidata entity being mapped
  wikidata_label: mansion
  
  primary_class:
    uri: crm:E27_Site
    namespace: http://www.cidoc-crm.org/cidoc-crm/
    rationale: >-
      CIDOC-CRM E27_Site for physical heritage buildings with 
      archaeological/architectural significance.
    ontology_file: data/ontology/CIDOC_CRM_v7.1.3.rdf
    ontology_section: "Lines 1234-1267"  # Optional
  
  secondary_class:
    uri: schema:LandmarksOrHistoricalBuildings
    namespace: http://schema.org/
    rationale: Web discoverability for historic landmarks
    ontology_file: data/ontology/schemaorg.owl
  
  properties:
    - uri: crm:P1_is_identified_by
      range: crm:E41_Appellation
      usage: Building name identification
      example: "Buitenplaats Beeckestijn"
    
    - uri: schema:geo
      range: schema:GeoCoordinates
      usage: Geographic coordinates
      example: "{latitude: 51.9711, longitude: 6.7197}"
  
  temporal_model:
    aspects:
      - place  # Physical site
      - custodian  # If operates as heritage institution
      - collections  # If holds curated materials
    
    temporal_independence_note: >-
      Place existence (construction → present) is independent from 
      custodian organization lifecycle (founding → present).
  
  complexity_score: 9  # 1-10 scale
  reviewed_by: human_expert
  review_date: "2025-11-20"
```

---

## Rule 8: Prohibited Practices

**The following practices are STRICTLY FORBIDDEN:**

### ❌ Prohibited

1. **Using Wikidata Q-numbers as class URIs**
   ```yaml
   # FORBIDDEN
   class_uri: wd:Q33506  # This is an entity, not a class!
   ```

2. **Creating custom properties without ontology research**
   ```yaml
   # FORBIDDEN
   slots:
     institution_official_name:  # Use skos:prefLabel instead!
   ```

3. **Single-ontology mappings for complex entities**
   ```yaml
   # FORBIDDEN - Mansion is BOTH place AND potential custodian
   Mansion:
     class_uri: schema:Place  # ← Missing custodian aspect!
   ```

4. **Ignoring temporal dimensions**
   ```yaml
   # FORBIDDEN - No temporal tracking
   custodian:
     name: "Heineken Archive"
     location: "Amsterdam"
     # ← Where are the dates? Which period does this describe?
   ```

5. **Binary public/private classifications**
   ```yaml
   # FORBIDDEN - Too simplistic
   PublicHeritageCustodian:  # What about NGOs? Foundations? Mixed?
   PrivateHeritageCustodian:  # What about government corporations?
   ```

---

## Rule 9: Quality Assurance Checklist

**Before submitting any ontology design, verify:**

- [ ] All base ontologies consulted (`/data/ontology/` files read)
- [ ] Wikidata entities mapped to formal ontology classes (not used directly)
- [ ] Multi-aspect modeling applied (place, custodian, legal, collections, people)
- [ ] Temporal independence documented for each aspect
- [ ] Properties sourced from ontologies (not custom inventions)
- [ ] Decision trees applied for ontology selection
- [ ] Rationale documented for all class/property choices
- [ ] Examples provided with real-world entities
- [ ] Complexity score assigned (1-10 scale)
- [ ] Human review requested for complexity ≥ 7

---

## Rule 10: Agent Collaboration Protocol

**When working with other agents or humans:**

1. **Always cite ontology files** in design discussions
   - "According to CIDOC-CRM (lines 1234-1267 in CIDOC_CRM_v7.1.3.rdf)..."

2. **Share ontology search commands** for reproducibility
   ```bash
   rg "E27_Site" /Users/kempersc/apps/glam/data/ontology/CIDOC_CRM_v7.1.3.rdf
   ```

3. **Document disagreements** with explicit rationale
   - "Agent A suggests schema:Museum, but I recommend cpov:PublicOrganisation 
     because institution is government-operated (see TOOI classification rules)."

4. **Request human review** for:
   - Complexity score ≥ 7
   - Conflicting ontology recommendations
   - Temporal modeling ambiguities
   - Novel aspect combinations

---

## Example: Complete Ontology Mapping Workflow

**Scenario**: Map Wikidata Q3437789 (heemkamer - local history room)

### Step 1: Research Entity
```bash
# Read Wikidata metadata from hyponyms_curated_full.yaml
grep -A 100 "Q3437789" /Users/kempersc/apps/glam/data/wikidata/GLAMORCUBEPSXHFN/hyponyms_curated_full.yaml
```

**Findings**:
- Dutch concept: "Local history room/museum"
- Usually operated by volunteers/heritage societies
- Mix of museum, archive, library functions
- Often in small municipalities

### Step 2: Search Base Ontologies
```bash
# Search CPOV for organizational types
rg "classification|OrganisationType" /Users/kempersc/apps/glam/data/ontology/core-public-organisation-ap.ttl

# Search Schema.org for community organizations
rg "NGO|CivicStructure|LocalBusiness" /Users/kempersc/apps/glam/data/ontology/schemaorg.owl

# Search CIDOC-CRM for community groups
rg "E74_Group|E40_Legal_Body" /Users/kempersc/apps/glam/data/ontology/CIDOC_CRM_v7.1.3.rdf
```

### Step 3: Apply Decision Trees

**Geographic scope**: Netherlands → Check TOOI  
**Legal status**: Usually private foundation (stichting) or association (vereniging)  
**Function**: Collects + Preserves + Exhibits local heritage → Multi-functional

**Decision**: 
- PRIMARY: `schema:NGO` (non-governmental heritage organization)
- SECONDARY: `crm:E74_Group` (community heritage group)
- DUTCH MIXIN: `DutchLegalEntityMixin` (KvK registration)

### Step 4: Model Aspects

```yaml
heemkamer:
  wikidata_id: Q3437789
  ontology_mapping:
    
    # CUSTODIAN ASPECT
    custodian_class: schema:NGO
    custodian_secondary: crm:E74_Group
    rationale: >-
      Non-governmental community heritage organization. 
      Not public sector (excludes CPOV). Uses Schema.org NGO.
    
    # PLACE ASPECT (often operates in specific building)
    place_class: schema:CivicStructure
    place_secondary: crm:E27_Site
    
    # LEGAL FORM ASPECT (Dutch foundation/association)
    legal_class: org:FormalOrganization
    legal_dutch_mixin: DutchLegalEntityMixin
    properties:
      kvk_number: required
      legal_form: "stichting OR vereniging"
    
    # COLLECTIONS ASPECT (multi-functional)
    collections_classes:
      - rico:RecordSet  # Local archival materials
      - crm:E78_Curated_Holding  # Museum objects
      - bf:Collection  # Local history books
    
    # PEOPLE ASPECT (volunteers)
    people_class: pico:PersonObservation
    people_roles:
      - picot_roles:curator
      - picot_roles:volunteer_archivist
      - picot_roles:educator
    
    temporal_model:
      aspects:
        - custodian  # Founding → present/closure
        - place  # Building occupancy (may change)
        - collections  # Accessions over time
        - people  # Volunteer participation periods
```

### Step 5: Document and Review

```yaml
ontology_enrichment:
  complexity_score: 8  # Multi-functional, temporal complexity
  requires_human_review: true
  review_notes: >-
    Heemkamer concept is Dutch-specific with no direct 
    international equivalent. Multi-functional nature 
    (museum + archive + library) requires careful aspect modeling.
```

---

## Summary: Key Takeaways for Agents

1. **Ontology files are your bible** - Read them first, always
2. **Wikidata is data, not ontology** - Map Q-numbers to formal classes
3. **Everything has multiple aspects** - Place, custodian, legal, collections, people
4. **Time is always a factor** - Model temporal independence
5. **Properties must be justified** - Use ontology properties, document rationale
6. **Complexity is reality** - Don't oversimplify, embrace nuance
7. **Document everything** - Future agents/humans need your reasoning
8. **Ask for help** - Complex cases require human review

**When in doubt**: Read the ontology files, consult AGENTS.md, request human guidance.

---

**End of Ontology Mapping Rules v1.0**