OPDA Knowledge base
Concept tier agent

Seller

opda:Seller

Seller

A Seller is the role borne by the party disposing of a Property in a Transaction. Seller is a Role Mixin: it can be borne by a Person or an Organisation, and it gets its identity from the (Transaction, bearer) pair.

Why it matters

Sellers in residential property are routinely individuals, but also frequently corporate landlords, executors, trustees, or housing associations. OPDA models Seller as a Role Mixin so one role-concept covers all the legitimate bearers without forcing a single party Kind, and so the role-specific properties (asserted capacity, evidenced authority) can attach uniformly regardless of bearer.

If you are an integrator working with seller-side data — capacity statements, conveyancer attribution, evidence chains — this is the entity whose IC governs how those records link back to the underlying Person or Organisation.

Hard cases

  • A Person who is Seller in two Transactions. Two Seller Role-instances on one Person — different Transactions, different role-specific properties. The Person identity persists.
  • An Organisation as Seller. A limited company disposing of a buy-to-let unit. The Seller Role Mixin is borne by the Organisation; downstream role-specific fields (capacity, evidenced authority) work identically.
  • Mixed-bearer chain. A transaction chain where one link’s Seller is a Person and the next link’s Seller is an Organisation. The Role Mixin handles the variation without splitting into PersonSeller and OrganisationSeller.
  • The Seller of one Transaction is the Buyer of the next. In a chain, this is the typical case: each link’s Buyer becomes the next link’s Seller. Two distinct Role Mixin instances on one Person — different Transactions.

Identity Criterion

A Seller Role-Mixin instance is identified by its (Transaction, bearer) tuple — the Transaction context plus the Person or Organisation bearing the role. The Role Mixin NEVER supplies its own identity. See the Logical tier → for the typed structure.

  • Role Mixin — Seller is the canonical OPDA Role Mixin alongside Buyer
  • Buyer — the mirror Role Mixin in the same Transaction
  • Person — a typical bearer of the Seller role
  • Organisation — the alternative bearer
  • Transaction — the Relator within which the Seller Role Mixin is borne
  • Claim — a Seller’s evidenced authority links to a Claim of authority (e.g. probate, power of attorney)
%%{init: {"theme": "base"}}%% flowchart LR accTitle: Seller related-Kinds neighbourhood graph accDescr: Seller as a RoleMixin borne by either a Person or an Organisation, founded by a Transaction, mirrored by Buyer; a Seller's authority links to a Claim. classDef centre fill:#E1BEE7,stroke:#6A1B9A,stroke-width:3px,color:#4A148C classDef cls fill:#B3E5FC,stroke:#0277BD,stroke-width:2px,color:#01579B classDef ext fill:#ECEFF1,stroke:#455A64,stroke-width:2px,color:#263238 Seller["Seller
(RoleMixin)"]:::centre Person["Person"]:::cls Organisation["Organisation"]:::cls Transaction["Transaction"]:::cls Buyer["Buyer
(mirror)"]:::cls Claim["Claim
(authority)"]:::ext RoleMixin["RoleMixin
(pattern)"]:::ext Seller -->|"borneBy"| Person Seller -->|"or borneBy"| Organisation Transaction -->|"founds"| Seller Transaction -->|"founds (mirror)"| Buyer Seller -.->|"asserts authority via"| Claim Seller -.->|"specialises"| RoleMixin

Source ODR

ODR-0006 — Agents and roles §Q2

Comments

Loading comments…