Open Property Data Association
Smart Property Data Trust Framework
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    Concept tier Module: claim

    Claim

    The Claim module covers verifiable assertions about a Property, a Transaction, or any party in them — and the evidence, verification, and trust framework that scope each Claim’s validity.

    The core triangle is Claim → Evidence → Verification Activity, with each Verification carrying an Assurance Level (eIDAS Low / Substantial / High) and citing the Trust Framework under which it was performed.

    Evidence comes in three subtypes that are deliberately not collapsed:

    • Document Evidence — paper or scanned artefacts issued by an authoritative source (e.g. grant of probate);
    • Electronic Record Evidence — API-retrieved structured records from an authoritative source (e.g. HMRC tax-record API);
    • Vouch Evidence — formal attestations by a regulated professional (e.g. SRA-licensed solicitor).

    The three short-name aliases (Document, Electronic Record, Vouch) exist for ergonomic compatibility with worked-example data; they are equivalent to the long-name forms.

    Entities

    Module-internal relationships

    The Claim → Evidence → Verification triangle, the three Evidence subtypes (with their short-name aliases), and the Trust Framework + Assurance Level scoping:

    --- config: layout: elk --- %%{init: {"theme": "base"}}%% flowchart LR accTitle: Claim module internal relationships accDescr: Claim supported by Evidence; Evidence specialises into Document, Electronic Record, and Vouch (with short-name aliases); Verification Activity produces a verified Claim from Evidence, assigning an Assurance Level and citing a Trust Framework. classDef cls fill:#E1BEE7,stroke:#6A1B9A,stroke-width:2px,color:#4A148C classDef alias fill:#FFF9C4,stroke:#F57F17,stroke-width:2px,color:#E65100 classDef ext fill:#ECEFF1,stroke:#455A64,stroke-width:2px,color:#263238 %% Core Claim["Claim
    (verifiable assertion)"]:::cls Evidence["Evidence
    (supertype)"]:::cls Verification["VerificationActivity"]:::cls Assurance["AssuranceLevel
    (Low | Substantial | High)"]:::cls Framework["TrustFramework"]:::cls %% Evidence subtypes DocEv["DocumentEvidence"]:::cls ERecEv["ElectronicRecordEvidence"]:::cls VouchEv["VouchEvidence"]:::cls %% Short-name aliases Doc["Document
    (alias)"]:::alias ERec["ElectronicRecord
    (alias)"]:::alias Vouch["Vouch
    (alias)"]:::alias %% Cross-module Seller["Seller
    (agent module)"]:::ext Person["Person
    (agent module)"]:::ext %% Subtype hierarchy Evidence --> DocEv Evidence --> ERecEv Evidence --> VouchEv %% OWL equivalence aliases DocEv ===|"owl:equivalentClass"| Doc ERecEv ===|"owl:equivalentClass"| ERec VouchEv ===|"owl:equivalentClass"| Vouch %% Core relationships Claim -->|"supportedBy (1..*)"| Evidence Verification -->|"verifies"| Claim Verification -->|"uses"| Evidence Verification -->|"assigns"| Assurance Verification -->|"underFramework"| Framework Framework -->|"defines"| Assurance %% Cap rule VouchEv -.->|"caps at eIDAS Low"| Assurance %% Cross-module attachment Seller -.->|"asserts authority Claim"| Claim Person -.->|"asserts identity Claim"| Claim

    Lifecycle: Claim verification chain (assurance levels)

    How a Claim is promoted (or downgraded) through the eIDAS assurance tiers depending on the Evidence chain backing it:

    %%{init: {"theme": "base"}}%% stateDiagram-v2 accTitle: Claim verification chain lifecycle accDescr: A Claim starts as an unverified assertion, is promoted via Verification Activity to Low, Substantial, or High assurance depending on its Evidence chain; Vouch-only Evidence caps at Low; downgrade is possible if Evidence is withdrawn. [*] --> Asserted : Claim created
    (no Verification yet) Asserted --> LowAssurance : Verification Activity
    backed by Vouch only
    or weak Electronic Record Asserted --> SubstantialAssurance : Verification Activity
    backed by Document
    or live Electronic Record Asserted --> HighAssurance : Verification Activity
    backed by court Document
    + corroborating evidence LowAssurance --> SubstantialAssurance : evidence strengthened
    (fresh Verification) SubstantialAssurance --> HighAssurance : evidence strengthened
    (fresh Verification) HighAssurance --> SubstantialAssurance : evidence weakened
    (downgrade Verification) SubstantialAssurance --> LowAssurance : evidence withdrawn
    (downgrade Verification) LowAssurance --> Contested : second Verification
    produces divergent verdict Contested --> [*] : governance decision
    (out-of-band) HighAssurance --> [*] : Claim verified
    at policy ceiling

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