Open Property Data Association
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    Modelling

    These are the PDTF schema-era semantic-modelling records. They explored how the published JSON Schema implementation could inform a linked-data stack — bounded contexts → controlled vocabulary → SKOS taxonomy → OWL ontology → SHACL validation → JSON-LD mappings — and now serve as qualified inputs to SPDTF development. Their artefacts retain their own maturity and do not inherit the schema implementation's published status.

    Foundations

    The architectural decisions and domain partitioning that shape every other modelling artefact.

    Foundation

    Standards stack

    PDTF schemas, OpenAPI, repos. The five-layer technical stack we're modelling on top of.
    Foundation

    Bounded contexts (DDD)

    Six primary industry contexts + five supporting contexts. This earlier model treated PDTF schema as their DDD Published Language.
    Foundation

    PDTF overlays

    Full catalogue of all 18 main + 16 extension overlays — definition, merge mechanics, and how each maps to a bounded context.

    Vocabulary & dictionary

    The shared terminology that everything else maps to.

    Built

    Data dictionary

    All 8,458 schema property entries, browseable inline. Headline numbers, audit, schema inventory, build pipeline and sources alongside.
    Built

    Business glossary

    All 554 SKOS concepts (54 curated OPDA terms + 500 schema-derived), browseable inline. Provenance, kind breakdown, and editorial roadmap alongside.
    Stub

    Concept taxonomy (SKOS)

    Hierarchical organisation of PDTF concepts. 9 top-level branches, deepening per overlay.

    Formal semantic layer

    The machine-readable specification of what the data means — not just what shape it has.

    Stub

    Ontology (OWL)

    Classes and properties for Transaction, Property, Participant, Claim, Document, Form, Search. Reuses W3C VC, Schema.org, FOAF/ORG, GeoSPARQL.
    Stub

    SHACL shapes

    Validation rules in RDF land. Mostly translatable from JSON Schema; hand-authored for cross-property business rules.
    Stub

    JSON-LD mappings

    Per-overlay @context files that bridge JSON property names to ontology terms. BASPI v5 first.

    Status at a glance

    ArtefactStatusWhere
    Standards stack survey✅ Built06-standards-stack.html
    Bounded-context model✅ Built12-bounded-contexts.html
    PDTF overlays catalogue✅ Built16-overlays.html
    Data dictionary✅ Built (auto-generated + interactive)13-data-dictionary.html
    Business glossary✅ Built (54 terms + 554 SKOS concepts, interactive)14-business-glossary.html
    Concept taxonomy (SKOS)⏳ Stub — top-level only30-concept-taxonomy.html
    Ontology (OWL)⏳ Stub — class list only31-ontology.html
    SHACL shapes⏳ Stub — pipeline designed32-shacl-shapes.html
    JSON-LD mappings⏳ Stub — BASPI v5 to be first33-jsonld-mappings.html

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