Open Property Data Association
Smart Property Data Trust Framework
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    Contextual boundaries

    The candidate does not force every participant to use one universal meaning. Each resource belongs to one semantic home, while the Common boundary carries only meaning genuinely needed for exchange across several domains.

    Boundary map

    Common boundary Bounded context Scheme context Shared elements supplied by the Common boundary
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    The arrows show shared elements supplied by the Common boundary. Cross-context mappings are a separate SKOS concern and no such mappings have yet been accepted.

    Contextual-boundary register

    Semantic home

    Common boundarycommon

    Kind

    Common boundary

    Definition

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

    OWL resources
    2
    Source data points
    1
    Shapes
    1

    Semantic home

    Conveyancingconveyancing

    Kind

    Bounded context

    Definition

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

    OWL resources
    53
    Source data points
    206
    Shapes
    13

    Semantic home

    Estate agencyestate-agency

    Kind

    Bounded context

    Definition

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

    OWL resources
    18
    Source data points
    7
    Shapes
    6

    Semantic home

    Finance and bankingfinance-and-banking

    Kind

    Bounded context

    Definition

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

    OWL resources
    10
    Source data points
    7
    Shapes
    4

    Semantic home

    Property data servicesproperty-data-services

    Kind

    Bounded context

    Definition

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

    OWL resources
    48
    Source data points
    197
    Shapes
    12

    Semantic home

    Property technologyproperty-technology

    Kind

    Bounded context

    Definition

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

    OWL resources
    10
    Source data points
    6
    Shapes
    4

    Semantic home

    Surveying and valuationsurveying-and-valuation

    Kind

    Bounded context

    Definition

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

    OWL resources
    15
    Source data points
    26
    Shapes
    4

    Semantic home

    DBT Smart Data candidate semantic contextdbt-smart-data

    Kind

    Cross-sector scheme context

    Definition

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

    OWL resources
    3
    Source data points
    1
    Shapes
    1

    Interpretation rules

    One semantic home

    Each OPDA resource has one semantic home; common is exceptional and does not control internal domain meaning.

    Six bounded contexts

    Conveyancing, Estate agency, Finance and banking, Property data services, Property technology, and Surveying and valuation own their internal meanings.

    DBT Smart Data is different

    It is a machine-proposed semantic context for authorisation and controlled sharing—not the external DBT programme, an OPDA working-group decision or a property-domain bounded context.

    Mappings are a separate SKOS concern

    The boundary arrows are not mappings. The selected source method requires a reviewed SKOS correspondence and a qualified SSSOM/SEMAPV record for internal cross-context as well as external mappings. This requirement does not claim that the current candidate implements those records. The register is currently empty and its status is awaiting working-group evidence. Read the Category 8 mapping method.

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