Open Property Data Association
Smart Property Data Trust Framework
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    Ontology (OWL)

    Formal class and property definitions for the PDTF semantic model, in OWL/Turtle. Reuses W3C VC, Schema.org, FOAF/ORG, and GeoSPARQL where they fit.

    See also: Ontology manual — Physical-Ontology tier

    The Physical-Ontology tier of the Ontology manual is the realisation of the OWL work described here. It documents the generator-emitted Turtle artefacts (OWL class definitions, SHACL shapes, SKOS vocabularies) with verbatim Turtle blocks from the source TTLs — the authoritative reference for ontology engineers.

    Status

    This is a stub for upcoming work. The structure below is what we plan to populate; existing artefacts in source/ that feed it are cited inline.

    Approach

    • Reuse before invent — Schema.org for Property/Place/Address; W3C VC for Claim/Issuer/Holder/Subject; FOAF/ORG for Person/Organisation; GeoSPARQL for spatial; DCAT for catalog metadata.
    • Mint PDTF terms only where existing vocabularies don't fit (UK-specific concepts like leasehold tenure, BASPI material information).
    • Stay aligned with the SPDTF spec (Smart Property Data Trust Framework) — which already uses W3C VC as the credential model.

    Proposed core classes

    ClassReuse / mintNotes
    pdtf:TransactionMintThe lifecycle entity; root of the data model
    pdtf:PropertySubclass of schema:PlaceThe physical asset
    pdtf:ParticipantSubclass of org:Organization / foaf:PersonIdentified by DID
    pdtf:ClaimSubclass of vc:CredentialThe atomic verifiable assertion
    pdtf:DocumentSubclass of schema:DigitalDocumentSupporting evidence
    pdtf:FormMintA canonical UK property form (BASPI, TA6, ...) as a class of claims
    pdtf:SearchMintA search result (CON29R, LLC1, OC1, ...)

    Output

    Target file: source/00-deliverables/semantic-models/ontology/pdtf.ttl. Empty folder exists; population pending.

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