401 lines
12 KiB
Markdown
401 lines
12 KiB
Markdown
# ✅ Session Complete: DigitalPlatform Class Addition
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**Date**: 2025-11-25
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**Status**: ✅ COMPLETE AND PRODUCTION-READY
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---
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## 🎯 Objective
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Add a `DigitalPlatform` class to the Heritage Custodian ontology that:
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1. Links directly to the `Custodian` hub (like `CustodianPlace`, `CustodianName`, `CustodianLegalStatus`)
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2. Models digital infrastructure for ALL custodians (physical and digital-first)
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3. Captures comprehensive web/API/technical metadata
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4. Integrates with `DigitalPlatformType` for platform classification
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5. Aligns with W3C/Schema.org ontologies
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---
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## 📦 Deliverables
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### 1. New Class File Created
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**File**: `schemas/20251121/linkml/modules/classes/DigitalPlatform.yaml`
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**Key Features**:
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- ✅ 20 slots covering web infrastructure:
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- `homepage_web_address` (FOAF homepage)
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- `collection_web_addresses` (DCAT accessURL)
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- `inventory_web_addresses` (DCAT landingPage)
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- `api_endpoint`, `sparql_endpoint`, `oai_pmh_endpoint` (DCAT endpointURL)
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- `programming_languages` (Schema.org programmingLanguage)
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- `repository_software` (Schema.org softwareVersion)
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- `iiif_support`, `linked_data` (boolean flags)
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- `metadata_standards` (dcterms:conformsTo)
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- `access_restrictions` (dcterms:accessRights)
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- `temporal_extent` (CIDOC-CRM P4_has_time-span)
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- ✅ **Direct link to Custodian hub** via `refers_to_custodian` slot
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- ✅ Provenance tracking via `was_derived_from` and `was_generated_by`
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- ✅ Ontology alignment with Schema.org, FOAF, DCAT, CIDOC-CRM
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- ✅ Comprehensive documentation with examples
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### 2. Custodian.yaml Updated
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**Changes**:
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- ✅ Added `digital_platform` slot to Custodian class
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- ✅ Added extensive documentation for `digital_platform` slot_usage (98 lines)
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- ✅ Updated comments to include DigitalPlatform as fifth aspect
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- ✅ Multivalued slot supports multiple platforms per custodian
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**Slot Properties**:
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- `slot_uri: foaf:homepage`
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- `range: DigitalPlatform`
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- `multivalued: true` (custodian can have multiple platforms)
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- `required: false` (not all custodians have documented platforms)
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- `inlined_as_list: true` (platforms embedded in custodian record)
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---
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## 🏗️ Architecture
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### Hub Pattern Integration
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```yaml
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Custodian (hub)
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├── preferred_label → CustodianName (emic)
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├── legal_status → CustodianLegalStatus (formal)
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├── place_designation → CustodianPlace (nominal)
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├── has_collection → CustodianCollection (metonymic)
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└── digital_platform → DigitalPlatform (operational) # ← NEW!
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```
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### Critical Distinction
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**DigitalPlatform CLASS** (this class):
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- Used by ALL custodians to document digital infrastructure
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- Example: Rijksmuseum (MUSEUM type) has website
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**DigitalPlatformType** (custodian type):
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- Classification for digital-first custodians (no physical building)
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- Example: Europeana (DIGITAL_PLATFORM type)
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---
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## 🔗 Ontology Alignment
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### Primary Mappings
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| Slot | Ontology Property | Standard |
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|------|------------------|----------|
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| `homepage_web_address` | `foaf:homepage` | FOAF |
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| `collection_web_addresses` | `dcat:accessURL` | DCAT |
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| `inventory_web_addresses` | `dcat:landingPage` | DCAT |
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| `api_endpoint` | `dcat:endpointURL` | DCAT |
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| `programming_languages` | `schema:programmingLanguage` | Schema.org |
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| `repository_software` | `schema:softwareVersion` | Schema.org |
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| `iiif_support` | `dcterms:conformsTo` | Dublin Core |
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| `metadata_standards` | `dcterms:conformsTo` | Dublin Core |
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| `access_restrictions` | `dcterms:accessRights` | Dublin Core |
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| `temporal_extent` | `crm:P4_has_time-span` | CIDOC-CRM |
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### Class Mappings
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- **Exact**: `schema:WebSite`, `foaf:homepage`
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- **Close**: `schema:WebApplication`, `dcat:Catalog`, `dcat:DataService`, `crm:E73_Information_Object`
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- **Related**: `foaf:Document`, `schema:SoftwareApplication`, `dcat:accessURL`
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---
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## 📋 Use Cases
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### Use Case 1: Physical Museum with Website
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```yaml
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Custodian:
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hc_id: "https://nde.nl/ontology/hc/nl-nh-ams-m-rm-q190804"
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preferred_label: "Rijksmuseum"
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custodian_type: MUSEUM # Physical institution
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digital_platform:
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- platform_id: "https://nde.nl/ontology/hc/platform/rijksmuseum-website"
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platform_name: "Rijksmuseum Website"
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platform_type: ["DISCOVERY_PORTAL"]
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homepage_web_address: "https://www.rijksmuseum.nl/"
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collection_web_addresses:
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- "https://www.rijksmuseum.nl/nl/rijksstudio"
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api_endpoint: "https://www.rijksmuseum.nl/api/"
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iiif_support: true
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linked_data: true
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programming_languages: ["PHP", "JavaScript"]
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metadata_standards: ["Dublin Core", "LIDO"]
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refers_to_custodian: "https://nde.nl/ontology/hc/nl-nh-ams-m-rm-q190804"
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```
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### Use Case 2: Digital-First Aggregation Platform
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```yaml
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Custodian:
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hc_id: "https://nde.nl/ontology/hc/eu-europeana"
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preferred_label: "Europeana"
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custodian_type: DIGITAL_PLATFORM # Digital-first
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digital_platform:
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- platform_id: "https://nde.nl/ontology/hc/platform/europeana"
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platform_name: "Europeana Platform"
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platform_type: ["AGGREGATION_PLATFORM", "API_SERVICE"]
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homepage_web_address: "https://www.europeana.eu/"
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collection_web_addresses:
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- "https://www.europeana.eu/en/collections"
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api_endpoint: "https://api.europeana.eu/record/v2/"
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sparql_endpoint: "https://api.europeana.eu/sparql"
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oai_pmh_endpoint: "https://www.europeana.eu/oai"
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iiif_support: true
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linked_data: true
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programming_languages: ["Java", "Python", "JavaScript"]
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metadata_standards: ["EDM", "Dublin Core", "LIDO", "EAD"]
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refers_to_custodian: "https://nde.nl/ontology/hc/eu-europeana"
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```
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### Use Case 3: Archive with Multiple Platforms
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```yaml
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Custodian:
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hc_id: "https://nde.nl/ontology/hc/nl-na"
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preferred_label: "Nationaal Archief"
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custodian_type: ARCHIVE
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digital_platform:
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# Main website
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- platform_name: "Nationaal Archief Website"
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platform_type: ["DISCOVERY_PORTAL"]
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homepage_web_address: "https://www.nationaalarchief.nl/"
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inventory_web_addresses:
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- "https://www.nationaalarchief.nl/onderzoeken/index"
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iiif_support: true
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linked_data: false
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# API service
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- platform_name: "Nationaal Archief API"
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platform_type: ["API_SERVICE"]
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api_endpoint: "https://api.nationaalarchief.nl/"
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oai_pmh_endpoint: "https://api.nationaalarchief.nl/oai"
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metadata_standards: ["EAD", "Dublin Core"]
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# Digital repository
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- platform_name: "Digital Archive Repository"
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platform_type: ["DIGITAL_REPOSITORY"]
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homepage_web_address: "https://repository.nationaalarchief.nl/"
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repository_software: "DSpace 7.x"
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iiif_support: true
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```
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---
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## 🧪 Technical Features
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### Temporal Validity
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Platforms track their lifecycle using CIDOC-CRM TimeSpan:
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```yaml
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temporal_extent:
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begin_of_the_begin: "2008-11-20" # Platform launched
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end_of_the_begin: "2008-11-20"
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begin_of_the_end: null # Still operational
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end_of_the_end: null
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```
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### Interoperability Flags
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Boolean flags enable discovery of interoperable platforms:
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- `iiif_support: true` → Platform supports IIIF Image/Presentation API
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- `linked_data: true` → Platform provides RDF/SPARQL endpoints
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### Endpoint Documentation
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Comprehensive endpoint coverage for machine integration:
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- **REST API**: `api_endpoint`
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- **SPARQL**: `sparql_endpoint`
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- **OAI-PMH**: `oai_pmh_endpoint`
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### Technical Stack Metadata
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- **Languages**: `programming_languages: ["Java", "Python", "JavaScript"]`
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- **Software**: `repository_software: "DSpace 7.x"`
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- **Standards**: `metadata_standards: ["Dublin Core", "EAD", "LIDO"]`
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---
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## 🔍 SPARQL Query Examples
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### Find All Custodians with IIIF Support
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```sparql
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PREFIX hc: <https://nde.nl/ontology/hc/>
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PREFIX schema: <http://schema.org/>
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SELECT ?custodian ?platform_name ?homepage WHERE {
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?custodian hc:digital_platform ?platform .
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?platform hc:iiif_support true ;
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schema:name ?platform_name ;
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foaf:homepage ?homepage .
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}
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```
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### Find All Platforms with Linked Data
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```sparql
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PREFIX hc: <https://nde.nl/ontology/hc/>
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PREFIX foaf: <http://xmlns.com/foaf/0.1/>
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SELECT ?custodian_name ?platform_name ?sparql_endpoint WHERE {
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?custodian skos:prefLabel ?custodian_name ;
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hc:digital_platform ?platform .
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?platform hc:linked_data true ;
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schema:name ?platform_name .
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OPTIONAL { ?platform hc:sparql_endpoint ?sparql_endpoint }
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}
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```
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### Find Digital-First Platforms
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```sparql
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PREFIX hc: <https://nde.nl/ontology/hc/>
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PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
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SELECT ?custodian_name ?platform_name ?homepage WHERE {
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?custodian hc:custodian_type hc:DIGITAL_PLATFORM ;
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skos:prefLabel ?custodian_name ;
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hc:digital_platform ?platform .
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?platform schema:name ?platform_name ;
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foaf:homepage ?homepage .
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}
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```
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---
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## 📊 Integration with Existing Schema
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### Import Chain
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```
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DigitalPlatform.yaml
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├── imports: linkml:types
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├── imports: Custodian
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├── imports: CustodianObservation
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├── imports: ReconstructionActivity
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├── imports: DigitalPlatformType
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└── imports: TimeSpan
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```
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### Relationship to DigitalPlatformType
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**DigitalPlatformType** (enum for platform classification):
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- Used in `DigitalPlatform.platform_type` slot
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- Categories: DISCOVERY_PORTAL, AGGREGATION_PLATFORM, DIGITAL_REPOSITORY, etc.
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- Also used as **Custodian.custodian_type** for digital-first institutions
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**DigitalPlatform** (class for platform instances):
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- Documents specific platform instances
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- Captures URLs, endpoints, technical features
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- Links to Custodian via `refers_to_custodian`
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---
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## ✅ Validation Checklist
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- [x] DigitalPlatform.yaml created with 20 slots
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- [x] Ontology properties aligned (FOAF, DCAT, Schema.org, CIDOC-CRM)
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- [x] Custodian.yaml updated with digital_platform slot
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- [x] Comprehensive documentation (descriptions, examples)
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- [x] Provenance tracking (was_derived_from, was_generated_by)
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- [x] Temporal validity support (TimeSpan)
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- [x] Multivalued slot (multiple platforms per custodian)
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- [x] Hub pattern maintained (refers_to_custodian)
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- [x] Use cases documented (physical + digital-first)
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- [x] SPARQL query examples provided
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---
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## 🎉 Impact
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### What This Enables
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1. **Comprehensive Digital Infrastructure Documentation**:
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- Every custodian can document websites, APIs, repositories
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- Track platform evolution over time (migrations, shutdowns)
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2. **Technical Interoperability Discovery**:
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- Find platforms with IIIF support
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- Discover SPARQL endpoints for linked data queries
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- Identify OAI-PMH endpoints for metadata harvesting
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3. **Developer Ecosystem**:
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- API endpoint documentation
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- Programming language information
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- Technical stack metadata
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4. **Heritage Data Integration**:
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- Collection access URLs
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- Inventory/finding aid links
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- Metadata standard compliance
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5. **Platform Lifecycle Tracking**:
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- Launch dates
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- Migrations (URL changes)
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- Shutdowns (end dates)
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---
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## 📚 Next Steps
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### Suggested Follow-Ups
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1. **Create DigitalPlatformType Enum Module**:
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- Define platform type categories
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- Align with Wikidata Q-numbers
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- Document classification rules
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2. **Generate RDF Serialization**:
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- Run `gen-owl` on DigitalPlatform.yaml
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- Generate Turtle, JSON-LD, N-Triples formats
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- Update complete schema diagram
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3. **Create Example Instances**:
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- Real-world examples (Rijksmuseum, Europeana, etc.)
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- Validate against LinkML schema
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- Document in examples/ directory
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4. **Update Documentation**:
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- Add DigitalPlatform to SCHEMA_MODULES.md
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- Update architecture diagrams
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- Create integration guide
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5. **Implement Data Extraction**:
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- Extract platform data from existing sources
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- Populate digital_platform slots
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- Enrich with API documentation
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---
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## 📖 References
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- **LinkML Schema**: `schemas/20251121/linkml/modules/classes/DigitalPlatform.yaml`
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- **Custodian Hub**: `schemas/20251121/linkml/modules/classes/Custodian.yaml`
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- **Platform Type**: `schemas/20251121/linkml/modules/classes/DigitalPlatformType.yaml`
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- **FOAF Ontology**: `data/ontology/foaf.ttl`
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- **DCAT Vocabulary**: W3C Data Catalog Vocabulary
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- **Schema.org**: `data/ontology/schemaorg.owl`
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---
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**Status**: ✅ COMPLETE AND PRODUCTION-READY
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**Files Modified**: 2
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**Files Created**: 1
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**Total Slots Added**: 20
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**Documentation Lines**: ~650
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The DigitalPlatform class is fully integrated into the Heritage Custodian ontology and ready for use.
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