Open Property Data Association
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    ODR Corpus

    The Ontology Decision Records (ODRs) are the Linked Data Council's historical deliberations and OPDA's current local modelling decisions — the why behind the approach. Each record identifies its own scope and authority, with the options considered, chosen outcome and consequences.

    66 records in total — every one is a live page rendered from its markdown. Records marked ✓ diagrams have been enriched with illustrative Mermaid diagrams per ADR-0024; the rest render as text until their enrichment wave lands.

    No. Title Kind Status Page
    0001 Linked Data Council: Review Methodology methodology accepted view · ✓ diagrams
    0002 Ontology Languages and Vocabularies Adopted architecture accepted view · ✓ diagrams
    0003 PDTF to Ontology: Programme and Work Breakdown programme accepted view · ✓ diagrams
    0004 PDTF Ontology Foundation architecture accepted view · ✓ diagrams
    0005 Property & Land: The Identity Crux pattern accepted view · ✓ diagrams
    0006 Agents & Roles pattern accepted view · ✓ diagrams
    0007 Transactions & Lifecycle pattern accepted view · ✓ diagrams
    0008 Property Descriptive Attributes pattern accepted view · ✓ diagrams
    0008d Authority-Retrieved Artefacts pattern accepted view
    0009 Claims, Evidence & Provenance pattern accepted view · ✓ diagrams
    0010 Overlay Profile Mechanism architecture accepted view · ✓ diagrams
    0011 Enumeration Vocabularies pattern accepted view · ✓ diagrams
    0012 Data-Governance Layer architecture accepted view · ✓ diagrams
    0013 SHACL Validation & Severity architecture accepted view · ✓ diagrams
    0014 Vocabulary Catalogue Amendments pattern superseded view · ✓ diagrams
    0015 Address & Geography pattern accepted view · ✓ diagrams
    0016 W3C Verifiable Credentials / DID Compatibility Layer mapping proposed view · ✓ diagrams
    0017 SHACL-AF Non-Blocking Data-Quality Rules pattern accepted view · ✓ diagrams
    0018 DPV Class-Level Co-Annotation Pattern pattern accepted view · ✓ diagrams
    0019 Bounded-Context Representation pattern accepted view · ✓ diagrams
    0020 Bounded-Context Scheme and Term→Context Mapping pattern accepted view · ✓ diagrams
    0021 Deferred Form/Profile-Layer Enhancements architecture accepted view
    0022 Descriptive-Layer Import Strategy & Property Categorisation architecture accepted view
    0023 Descriptive-Layer Follow-On Council Roadmap programme accepted view
    0024 Curated Category-G Walk — Leaf Dispositions and Modelling Rules pattern accepted view
    0025 Entailment Regime and Inference Semantics architecture accepted view
    0026 OWL-RL-Safe Ruleset Adoption and Unevaluated Modelling Axioms architecture accepted view
    0027 Classification, Roles, Inheritance, and SKOS — opda Modelling Doctrine architecture accepted view
    0028 Descriptive-Layer Conversion — Completeness Reconciliation programme accepted view
    0029 Inference/Validation Boundary and the Entailment-Regime Disposition architecture accepted view
    0030 Foundational-Ontology Choice: UFO-as-Lens, Scoped to the Relator Spine architecture accepted view
    0031 opda:ufoCategory and the Upper-Ontology Layer architecture accepted view
    0032 Relationship Layer — Reify Inter-Entity Associations as OWL Object Properties pattern proposed view
    0033 OWL/RDFS Axioms as Documentary AI-Signal — the Consolidated Doctrine architecture proposed view
    0034 Relationship-Residue Completion — Events, Information Objects, and the Aboutness/Provenance Boundary pattern proposed view
    0035 RML as OPDA's Bidirectional Schema-Provenance Verification Mechanism architecture accepted view
    0036 Independent classification facets methodology accepted view
    0037 Property applicability and standard RDFS semantics methodology accepted view
    0038 Independent contexts with explicit semantic bridges methodology accepted view
    0039 SKOS enumerations with SHACL closure methodology accepted view
    0040 Closed enumerations and open reference populations methodology accepted view
    0041 Kinds, roles and phases methodology accepted view
    0042 Place properties at the level that introduces their meaning methodology accepted view
    0043 A bounded OWL surface with explicit validation methodology accepted view
    0044 Selective materialisation and SHACL rules methodology accepted view
    0045 Boundaries follow accountable language methodology accepted view
    0046 Eight selected modelling concerns methodology accepted view
    0047 Domain structure uses one modelling standard methodology accepted view
    0048 Vocabulary and taxonomy from evidence methodology accepted view
    0049 Govern classification metadata independently methodology accepted view
    0050 One validation framework for authored and generated models methodology accepted view
    0051 Human-reviewed mappings between contexts methodology accepted view
    0052 Provenance, attribution and extraction quality methodology accepted view
    0053 Temporal state, validity and recorded history methodology accepted view
    0054 Sensitivity classification and bounded policy modelling methodology accepted view
    0055 Dublin Core annotations alongside classification metadata methodology accepted view
    0056 SSSOM provenance for cross-context mappings methodology accepted view
    0057 Conditional ODRL policy use through the DPV profile methodology accepted view
    0058 Named RDF 1.2 reifiers for mapping provenance methodology accepted view
    0059 Criterion-based identity across contexts: map before merging methodology accepted view
    0060 Distinguish data domains, subject areas and bounded contexts methodology accepted view
    0061 Check identity, rigidity, dependence and unity with explicit OntoClean constraints methodology accepted view
    0062 Organise by concern while preserving independent classification and model authority methodology accepted view
    0063 Foundational analysis without external upper-ontology subsumption methodology accepted view
    0064 Queryable strategic context maps linked to exact term mappings methodology accepted view
    0065 OPDA namespace topology and stable identifiers methodology accepted view

    About ODRs

    An ODR is one of two kinds of decision:

    • An ontological commitment (kind: pattern or mapping) — a declaration about what kinds of entities the domain contains, what their identity criteria are, what Roles or Phases they pass through.
    • An artefact-engineering decision (kind: architecture, methodology, or programme) — a decision about how to structure, name, govern, sequence, or process the artefacts that encode the ontology.

    Current ODRs follow the project's decision-record conventions: explicit status, context, alternatives, consequences and confirmation. Authorised corrections are recorded with an updated date and amendment history. Historical records retain their original context and policy; new records make their scope and relationships explicit.

    Methodology

    All ODRs are ratified by the Linked Data Council — a simulated panel of 9 named linked-data and ontology authorities whose published positions are used to evaluate modelling decisions from multiple perspectives. See ODR-0001 for the full methodology.

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