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Interoperability Levels for Dublin Core Metadata

Interoperability Levels for Dublin Core Metadata. Layered model. 1995-2008: from fifteen elements to Singapore Framework Increasingly formal model Legacy implementation experience “Description” versus “prescription” “Ladder of interoperability”: choices, costs, benefits.

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Interoperability Levels for Dublin Core Metadata

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  1. Interoperability Levels forDublin Core Metadata

  2. Layered model • 1995-2008: from fifteen elements to Singapore Framework • Increasingly formal model • Legacy implementation experience • “Description” versus “prescription” • “Ladder of interoperability”: choices, costs, benefits

  3. Level 1: Informal interoperability • DCMES: concepts with natural-language definitions • “Informal” interoperability of shared concepts • “Level 1 conformance” • Terms referenced in any way (URIs not required) • Formal domains and ranges not required • Conformance with DCAM not required • Example: IEEE LOM reuses DC term definitions and provides mapping to Simple Dublin Core

  4. Level 2: Semantic interoperability • Based on correct use of formal RDF semantics • Uses RDF vocabularies such as DCMI Metadata Terms • Formally stated relationships between terms as basis for inferencing • “Level 2 conformance” • Supplies mapping to RDF triples (e.g., via GRDDL transform) • URIs of terms must be clear • Conformance with formal semantics (domains, ranges, sub-property relations) of terms used • Conformance with DCAM is not a requirement • Examples • All RDF data is “semantically interoperable” with DC metadata • All data with GRDDL transforms • All data using 2008 DC-HTML specification

  5. Level 3: DCAM-based syntactic interoperability • DCAM “Descriptions” and “Description Sets” • Layered on top of unbounded RDF graphs • Provides basis for validation and exchange of managed metadata records • Extended model of “statements” as graphs using various combinations of Value URIs, Value Strings, and VES URIs. • “Level 3 Conformance” • Metadata must be structured using DCAM notions of Descriptions and Description Sets • Statements in a Description must use the structure defined by DCAM • Test: Is there a complete mapping to DC-TEXT?

  6. Level 4: Singapore Framework interoperability • Set of specifications needed in order to document a metadata application for maximum interoperability and reusability • Functional Requirements, Domain Model, Description Set Profile • All mandatory components must be present • Test: Is there a complete Domain Model and Description Set profile? Explicit functional requirements? • Examples: • Eprints/SWAP (in progress)

  7. Implikationen für KIM • Zertifizierungskriterien prüfen Singapore-Framework-Kompatibilität • “Level 2”-Kompatibilitäts-Kriterien denkbar • XML-Anwendungen mit GRDDL Transforms?

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