Open Property Data Association
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    UFO meta-category

    Substance Kind

    9 classes classified under the UFO foundational meta-category Substance Kind — from the inert opda:ufoCategory facet (an annotation-graph-only documentary annotation; UFO-informed, not UFO-grounded). The classification doctrine keeps kinds as facets, not subclass trees (ODR-0027).

    Classes · 9

    ClassDefinition (rdfs:comment)
    opda:Address Socially-recognised locator constructed by an authority (Royal Mail / OS AddressBase / HMLR / INSPIRE) and persisting as a record-entity in that authority's stewardship. UFO Substance Kind; DOLCE NonPhysicalEndurant. IC over five hard cases per ODR-0015 §3a: cosmetic re-format; authority-internal succession; cross-variant identity-claim never collapses; Property-side change; INSPIRE-only locatedness. NOT a Mode (S015 Q1 commitment).
    opda:DiagnosticExemplar Informational endurant. IC: the named hard case — minimal Turtle exposing one IC-bearing surface as input to a Council session's identity-criterion validation. Hard cases: registered freehold house; unregistered house pre-first-registration; flat with split UPRN.
    opda:LegalEstate Legal rights-bundle vested in a Property. UFO Substance Kind; DOLCE NonPhysicalEndurant (Searle 1995 legal-institutional object). IC: rights-bundle persistence — same individual through grant, transfer, registration, and discharge events; distinguishable from coexisting RegisteredTitle and physical Property by extent of property rights. Hard cases: tenure change; lease grant; lease termination; commonhold conversion; first registration of pre-existing common-law estate.
    opda:NearbyFacility A point-of-interest near the Property — a school, health-care facility, or transport node listed in propertyPack.nearbyFacilities for amenity context. UFO Substance Kind: a mind-independent social-physical endurant with its own identity criterion (a real-world facility persists through renaming, re-rating, and change of operator), distinct from the Property being transacted — NOT a Quality of opda:Property, since the same facility neighbours many properties (ODR-0024 R4 / session-028 Q1). Warranted on that UFO Substance-Kind basis, NOT ODR-0008 §Q4a (a provenance / lifecycle / PII test whose promotions are all Information Objects, which does not license a real-world facility). The genus bears all band attributes for the first cut (school / health-care / transport), band-scoped via SHACL in the overlay profiles; the per-band subkind split is held-as-live (Guizzardi dissent). Bears opda:distanceInMiles (proximity to the Property).
    opda:Organisation No DPV class-level PII baseline for opda:Organisation per ODR-0006 §Q6 + ODR-0018 §Rule 4. Organisations are not data subjects; the sole-trader / individual-director surface produces an opda:Person co-annotation (linked via the actor's ownership / control relationship), not an Organisation co-annotation.
    opda:Person Natural person. UFO Substance Kind; DOLCE Endurant. IC: FIBO-style multi-identifier persistence (date-of-birth + state-issued ID + name) over name-change, gender-recognition, and death hard cases. Anchors PII regimes (DPV co-annotation lands per ODR-0018 in opda-annotations.ttl; ADR-0012 emits).
    opda:Property Physical property. UFO Substance Kind; DOLCE Endurant / PhysicalObject. IC: spatial-material continuity with Kendall+Davis legal-record-discontinuity-override hybrid (ODR-0005 §3a). Hard cases: demolition; subdivision; merger; replacement; first-registration; flat with split UPRN.
    opda:RegisteredTitle HMLR title-register record. UFO Substance Kind (informational); DOLCE NonPhysicalEndurant. IC: title-number lineage + registry-event history (every lifecycle event captured as a reified prov:Activity with explicit prov:wasDerivedFrom / prov:wasInvalidatedBy triples). Hard cases: first registration (title opening); title closure; title merger; transfer between registers; title reissue on corrupt-plan replacement.
    opda:ValidationContext Reification of an overlay-profile validation context per ODR-0010 §Q1 (Guarino withdrawal condition). Each instance carries five properties: opda:profileURI, opda:requires, opda:overlaysContext, opda:sourcedFrom, opda:formVersion. Anchors per-profile cardinality/enum constraints in a named context — converting conditionality from 'required (depending)' to 'required relative to a named, dereferenceable context'. ADR-0013 emits per-profile instances under <https://opda.org.uk/pdtf/Baspi5ValidationContext> etc.

    All classes by module: Classes; the UFO meta-category legend: Foundations; the classification doctrine: Identity & classification. Full index: Index & glossary.