OPDA Knowledge base
Concept tier claim

Trust Framework

opda:TrustFramework

Trust Framework

A Trust Framework is a governance regime that scopes claim validity — for example, the UK Property Data Trust Framework. A Verification Activity cites its Trust Framework so consumers know under which governance the Claim was verified.

Why it matters

A Claim verified under one Trust Framework may not be valid under another. Cross-framework reuse requires either an explicit equivalence binding (rare, governance-heavy) or fresh verification under the receiving framework. OPDA models the Trust Framework explicitly so the scoping of every Verification is auditable — no Claim is “just verified”, every Claim is “verified under ”.

If you are interoperating with overseas property data, or reviewing whether a Claim verified under one Trust Framework can be relied on under another, this is the entity that makes the scoping explicit.

Hard cases

  • Cross-framework Claim. A Claim verified under Framework A is presented under Framework B. The IC says: the verification is under A; under B it is either re-verified or treated as unverified. The framework is not optional metadata.
  • Framework versioning. A Trust Framework v1 and v2 may carry different rules. The Verification Activity cites a specific version; v1 verifications do not automatically carry forward to v2.
  • Authoritative within scope. Per Session 003c Item 3, the OPDA Trust Framework is authoritative within its own scope — verifications outside scope are not OPDA-authoritative regardless of evidence quality.

Identity Criterion

A Trust Framework is identified by its (framework URI, version) pair. Two records refer to the same Trust Framework only if both components match. See the Logical tier → for the typed structure.

%%{init: {"theme": "base"}}%% flowchart LR accTitle: Trust Framework related-Kinds neighbourhood graph accDescr: Trust Framework as the governance regime cited by every Verification Activity; defines the Assurance Level scheme; identified by (framework URI, version); scopes Claim validity. classDef centre fill:#E1BEE7,stroke:#6A1B9A,stroke-width:3px,color:#4A148C classDef cls fill:#B3E5FC,stroke:#0277BD,stroke-width:2px,color:#01579B Framework["TrustFramework
(URI + version)"]:::centre Verification["VerificationActivity"]:::cls Claim["Claim"]:::cls Assurance["AssuranceLevel"]:::cls Verification -->|"underFramework"| Framework Claim -->|"scopedBy (via Verification)"| Framework Framework -->|"definesScheme"| Assurance

Source ODR

ODR-0009 — Claims, evidence, provenance §Q5

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