Open Property Data Association
Smart Property Data Trust Framework
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    Property Pack definition and 451-item scope

    A first-principles model of exactly 451 required source data points as 159 candidate ontology resources across bounded contexts and a deliberately small common boundary. The source rows are evidence to model—not 451 pre-decided RDF properties.

    Review candidate—not an approved semantic release

    Every item has a machine-proposed semantic home, role, disposition and trace to one or more model constructs. These are reviewable hypotheses, not settled meaning. Working groups must challenge the definitions and context ownership; the Interoperability Working Group must review common-boundary terms and mappings. This candidate does not replace the current published ontology.

    451source data points covered
    159candidate ontology resources
    8semantic homes
    14controlled vocabularies
    1source item in common
    56passing deterministic checks

    Semantic homes

    Each candidate resource has one owner. The common boundary is exceptional: it carries only meaning genuinely shared across domains and does not control a bounded context's internal language. The number in each card is its source data-point count.

    common boundary

    Common boundary

    A deliberately small exchange boundary for stable identity and meaning genuinely shared by several property domains.

    bounded context

    Conveyancing

    Legal title, ownership, rights, disclosure, completion and transfer meanings used in conveyancing.

    scheme context

    DBT Smart Data

    Scheme-level authorisation and controlled sharing meanings that apply across participating sectors.

    bounded context

    Estate agency

    Marketing, pricing, letting, media and consumer disclosure meanings used in estate agency.

    bounded context

    Finance and banking

    Mortgage, repayment, insurance and financial-obligation meanings used by lenders and advisers.

    bounded context

    Property data services

    Authoritative and derived property information supplied through searches, registers, certificates and utility records.

    bounded context

    Property technology

    Digital property records, smart-home capabilities and connectivity meanings used by property technology.

    bounded context

    Surveying and valuation

    Physical construction, condition, alteration and installed-feature meanings used to inspect and value property.

    Cross-domain mappings: awaiting working-group evidence. The current candidate asserts no default owl:sameAs relationships. See the Category 8 mapping method and current non-claims.

    Candidate artefacts

    All views are generated from the maintained TOML model and the closed 451-item evidence catalogue.

    Business glossary

    Generated candidate terms and definitions.

    Open artefact

    Data dictionary

    Generated candidate data definitions and constraints.

    Open artefact

    Controlled vocabularies

    Candidate schemes and controlled values.

    Open artefact

    Context map

    Declared semantic-home boundaries.

    Open artefact

    Candidate manifest

    Version, scope and source cut details.

    Open artefact

    Validation receipt

    Deterministic validation evidence.

    Open artefact

    How to read this baseline

    Source evidence

    Workbook row, full JSON path, field name, source datatype, status, condition and source description are preserved verbatim.

    Candidate meaning

    Each source item has a proposed definition, semantic home, model role, disposition, vocabulary and trace to candidate resources.

    Deterministic assurance

    Coverage, trace closure, RDF syntax, SHACL probes and SPARQL competency questions are regenerated and checked without granting semantic approval.

    Browse all 451 items

    Search by label, definition or full source path. Filter by bounded context, proposed model role, disposition, datatype, requiredness or vocabulary use. Select a label to inspect the source evidence, candidate semantics, constraints and traced model constructs together.

    Download the generated JSON list Read ADR-0066 Read ADR-0067

    Validation boundary

    Workbook reconciliationPass — 451/451 required rows accounted for
    Unique source identities451 full JSON paths and 451 stable catalogue IDs
    Candidate coveragePass — every item has one semantic home and reaches at least one traced ontology resource
    RDF profileRDF 1.2 Basic syntax accepted by Apache Jena RIOT version 6.1.0; full RDF 1.2 is not claimed
    SHACL profileSHACL 1.2 Core target; positive and negative core-subset probes pass under Apache Jena SHACL version 6.1.0
    SPARQL profileSPARQL 1.2 target; portable competency-query subset passes under Apache Jena version 6.1.0
    Semantic authorityMachine-proposed — working-group review and recorded human disposition remain required

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