Open Property Data Association
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    Concept tier foundation

    Role

    https://opda.org.uk/pdtf/Role

    UFO Role — anti-rigid, sortal role. An instance of a Role is borne by a bearer drawn from a single substantial Kind (e.g. Proprietor is borne by a Person — or by an Organisation under a named specialisation, but never simultaneously). A Role NEVER supplies its own identity; it borrows identity from its bearer (ODR-0005 Anti-pattern §3 — never key a Role). Per ODR-0006 §Q2.

    Classification

    UFO: Role (Guizzardi 2005 Ch. 4 §4.4 — anti-rigid, externally founded, sortal). Distinguished from RoleMixin by sortal commitment to a single Kind.

    Relationships

    Predicate Target Cardinality Inverse Description
    playedBy Organisation 0..* plays Role → bearer navigable edge: the Person or Organisation that plays this Role qua-individual. Documentary "any-of" domain/range (ODR-0032 §R2 session-050 amendment; schema.org domainIncludes idiom): rdfs:domain opda:Role , opda:RoleMixin (the subject is an opda:Role — Proprietor — OR an opda:RoleMixin — Seller/Buyer — sibling role meta-classes) and rdfs:range opda:Person , opda:Organisation (the bearer), each MULTIPLE triples read DISJUNCTIVELY per the module-header convention, NOT the RDFS §3.2 conjunction. Authored as AI-signal, NEVER entailed (zero domain/range triples materialise, ADR-0035 — so the range does NOT entail every bearer is a Person). The authoritative disjunctions live in SHACL sh:or (subject: opda:RolePlaySubjectShape; bearer: opda:RolePlayShape / opda:SellerShape / opda:BuyerShape), NOT owl:unionOf (excluded construct). OPTIONAL / distinct-node-only per Council session-047 Q4: emitted only where the role qua-individual is a node distinct from its bearer; never a self-edge. Coexists with role co-typing (ODR-0006 §Q2) — the typed encoding is the canonical IC, this is the navigable link for the distinct-node case (a qua-individual, prov:Agent-attested participant). Inverse: opda:plays.

    Sources

    • harness/odr/ODR-0006/section-Q2

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