Property Pack ontology
The Property Pack is the standardised bundle of information needed to support a property transaction. This ontology candidate models that bundle as a defined part of SPDTF, spanning several semantic contexts rather than pretending it is one universal business domain.
Accelerated determination
The Technical Working Group must determine this candidate by the end of
September 2026. The current 0.1.0-draft
model remains machine-proposed. Later domain,
scheme and Interoperability working-group review may propose controlled changes;
none of those reviews or an external authority decision has yet occurred.
What a Property Pack is
It is an exchange and delivery profile: a governed set of information that travels with a property transaction and draws on conveyancing, estate agency, finance, property-data services, property technology, surveying and shared identifiers. The 451 required source items define the current coverage boundary; they do not prescribe 451 RDF properties or reproduce the structure of a JSON document.
Candidate at a glance
Contextual boundaries
Every ontology resource has one semantic home. The dashed arrows point from the Common boundary because it supplies a small set of shared elements; they do not mean that every context interoperates through it, and they do not assert mapping, control or inheritance. Cross-domain mappings are a separate Category 8 review concern and remain awaiting working-group evidence.
Common boundary
A deliberately small exchange boundary for stable identity and meaning genuinely shared by several property domains.
Bounded contextConveyancing
Legal title, ownership, rights, disclosure, completion and transfer meanings used in conveyancing.
Bounded contextEstate agency
Marketing, pricing, letting, media and consumer disclosure meanings used in estate agency.
Bounded contextFinance and banking
Mortgage, repayment, insurance and financial-obligation meanings used by lenders and advisers.
Bounded contextProperty data services
Authoritative and derived property information supplied through searches, registers, certificates and utility records.
Bounded contextProperty technology
Digital property records, smart-home capabilities and connectivity meanings used by property technology.
Bounded contextSurveying and valuation
Physical construction, condition, alteration and installed-feature meanings used to inspect and value property.
Scheme contextDBT Smart Data
Scheme-level authorisation and controlled sharing meanings that apply across participating sectors.
Explore the reference
Definition and scope
Inspect every required source item, constraint, semantic home, candidate disposition and evidence trace.
LineagePDTF schema lineage
Separate proven schema coverage from the incomplete semantic crosswalk to the ontology extracted from PDTF schema.
AtlasComplete model
A class-relationship diagram in the PDTF schema convention, with synchronized structured references for all 159 candidate resources.
OWLOntology resources
Human definitions, technical identifiers, semantic homes, domains, ranges, constraints and evidence traces.
451 itemsData dictionary
The exact Property Pack source scope, source constraints and candidate-model disposition for every item.
SKOSControlled vocabularies
Fourteen curated value schemes plus the distinct source-topic concept layer.
SHACLValidation shapes
Forty-five target-class shapes and every emitted datatype, class, count and pattern constraint.
TraceableSource coverage
How all 451 source items reach candidate constructs without importing the legacy ontology.
Exact claimsStandards profile
RDF 1.2 Basic, SPARQL 1.2 and SHACL 1.2 targets, with explicit non-claims.
EvidenceTechnical validation
Parser, SHACL probe, competency-query and deterministic-regeneration results.
PendingTechnical determination
Review remit, deadline, evidence, questions and the decision record that must be completed before any determination is claimed.
LaterReview and releases
How later domain review, controlled change and immutable versions follow the accelerated technical determination.
Scope and authority
Closed business-data scope
Exactly the 451 workbook rows marked Required. Supporting ontology constructs make the data meaningful but do not enlarge that business-data scope.
Greenfield semantics
The PDTF schema contains the Property Pack source definition. The separate schema-derived ontology is expected to express corresponding meaning, but that coverage is not yet proven. This candidate imports neither topology; the item-level semantic crosswalk remains incomplete.
Human authority
AI drafted the candidate. The Technical Working Group makes the accelerated initial determination; later working groups may review and propose versioned changes. Government use does not itself grant OPDA external authority.
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