Concept tier agent

Buyer

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

UFO RoleMixin (anti-rigid; cross-sortal — borne by Person OR Organisation). Founded by an opda:Transaction Relator. The Buyer role of one transaction may correspond to the Seller role of the next in a TransactionChain (cf. exemplar chain-of-transactions.ttl).

Classification

UFO: RoleMixin (Guizzardi 2005 Ch. 4 §4.4). Mirror of opda:Seller founded by the same Transaction.

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.

Constraints

BuyerShape sh:Violation

An opda:Buyer role, where it names a distinct bearer node via opda:playedBy, MUST be played by an opda:Person OR an opda:Organisation (ODR-0006 §SHACL role-play shape; Council session-047 Q4). OPTIONAL — co-typed roles with no distinct bearer node are conformant (no sh:minCount, never a self-edge).

Sources

harness/odr/ODR-0006/section-Q2