Model
Four-tier presentation of the OPDA ontology model. Each tier targets a distinct audience and presents the same underlying data model at a different level of abstraction. The tiers are linked by stable per-entity URIs so a reader can traverse from business narrative to deployed Turtle without losing the thread.
This manual is generated from the 24 emitted TTL files at source/03-standards/ontology/ per the
information-architecture blueprint.
Tier index
| Tier | Audience | What it answers |
|---|---|---|
| Concept | Property-industry SMEs — surveyors, conveyancers, lenders, government data leads | "What does an OPDA Property mean, and why does Identity Criterion matter?" — business-language narrative, hard cases, IC. No jargon. |
| Logical | Data engineers, solution architects, integration architects | "What typed attributes does Property have, and how does it relate to Address, LegalEstate, Transaction?" — ER diagrams, typed attribute tables, cardinalities. Platform-independent. |
| Physical — deployment | Triplestore operators, SPARQL consumers, devops | "Which named graph holds opda:Property, and how do I fetch it from w3id.org/opda/Property?"
— deployment topology, named-graph layout, content-negotiation, CI gates.
|
| Physical — ontology | Ontology engineers, SHACL implementers, regulators | "Which Turtle file emits opda:Property, what SHACL shapes constrain it?"
— OWL / SHACL / SKOS / Turtle verbatim.
|
How to navigate
- Start by audience. Pick the tier that matches your role from the table above. Each tier's overview page lists every entity, scheme, and exemplar in that tier.
- Follow an entity across tiers. Every entity has a stable file path that mirrors across Concept, Logical, and Physical-Ontology tiers. Cross-tier links at the bottom of each entity page take you to its presentation in the other tiers.
- Trace from URI back to docs. Every
opda:<EntityName>URI in the source TTLs carries adct:sourceURI that resolves into the Concept tier.
See also: Validation report · Information architecture
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