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RDA: thinking globally, acting globally
- 1. RDA: thinking globally, acting globally Gordon Dunsire Presented at International Developments in Library Linked Data: Think Globally, Act Globally – Part Two: an ALCTS Program, ALA Annual, Las Vegas, USA, 28 Jun 2014
- 2. Overview Failure of top-down approach RDA tools Case: intended audience Mapping the focus of description Top-down, bottom-up issues
- 3. BibO: Bibliographic Ontology Confusing tongues? BIBFRAME: Bibliographic Framework Say what we mean CRM: Conceptual Reference Model DC: Dublin Core FR: Functional Requirements ISBD: International Standard Bibliographic Description MARC21 RDA: Resource Description and Access schema.org UNIMARC KOS++ Universal Bibliographic Control RDF Thinking globally Acting locally
- 4. For unFRBRized applications 30 million (partial) examples Links to other vocabularies Element set + Relationship designators
- 5. Globalizing RDA linked data Language-neutral URIs (immutable) Language-specific URIs (for developers) Language-specific labels and definitions (for humans)
- 6. Unconstrained versions Map of “Audience” umarc: m “adult, general” “adult, serious” pbcore: adult “adult” m21: e “adult” MPAA: NC-17? BBFC: 18? Element sets (schema) Value vocabularies (KOS) Broader/narrower/same? m21: “Target audience of …” m21: “Target audience” schema: “audience” dct: “audience” rdau: “Intended audience” isbd: “has note on use or audience” isbdu: “has note on use or audience” rdfs:subPropertyOf umarc: k bf: “Intended audience” frbrer: “has intended audience” rdaw: “Intended audience”
- 7. isbd: Resource bf: Work bf: Instance rda: Work rda: Expression rda: Manifestation rda: Item isbd:P1193 (has work aspect ) isbd:P1190 (has expression aspect ) isbd:P1192 (has manifestation aspect ) isbd:P1191 (has item aspect ) rdae:P20231 (has work expressed) rdai:P40049 (has manifestation exemplified) rdam:P30139 (has expression manifested) bf: instanceOf bf: expressionOf marc21: Resource ? Mapping entities
- 8. Top-down Examine local schema Identify the common elements Create a common/global element set (RDF) Refine the global element set to connect down (map) to specific local elements Issues Common elements may not cover the same space as local elements Refinement not possible Common elements have to be augmented Favours the global over the local Encourages a good-enough approach
- 9. Bottom-up Publish the local schema(s) in RDF Map local elements from different schema to lowest common (dumber) elements – add new elements if necessary Continue until all local schema have been mapped Issues Multiplicity of RDF element sets Frequent overlap and redundancy Local management resources
- 10. Thank you! jscchair@rdatoolkit.org rdaregistry.info Published RDA element sets rdvocab.info Published RDA value vocabularies https://github.com/RDARegistry/RDA- Vocabularies Project: versions, issues, feedback
Hinweis der Redaktion
- The relationships between entities from different data models that focus on essentially the same thing, a bibliographic resource, are not straightforward. * RDA provides relationship properties for the WEMI/IMEW stack – only the direction of the cardinality constraints is shown for clarity. * The ISBD and FRBR Review Groups have agreed to provide properties to relate the single ISBD entity Resource with the FRBR WEMI entities. These were added to the ISBD namespace with “New-proposed” status in 2013. * BIBFRAME provides relationship properties to link BIBFRAME Work and Instance entities. * BIBFRAME also provides a property to “connect Works under FRBR/RDA rules”; that is, to link two BIBFRAME works. * Where does MARC 21 fit in? Can we assume that the domain of MARC is a single entity similar to, if not the same as, ISBD’s Resource? That is certainly the case with UNIMARC. What are the relationships between the BIBFRAME entities and Resource? * What should the relationships between BIBFRAME and RDA entities look like? It seems only necessary to related a BIBFRAME Work to an RDA Expression, because the constraint locks it to a single RDA Work. That is, a BIBFRAME Work is directly related to RDA Expression, not an RDA Work.