RDA cataloguing and linked data

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RDA cataloguing and linked data February 24, 2019 RDA cataloguing and linked data Gordon Dunsire, Chair, RSC Presented at First Colloquium on RDA in Latin America Mexico City, Mexico, 15 November 2018 February 24, 2019

24/02/2019

RDA and linked data 2006: DCMI, Colima, Mexico 2007: “London meeting” with linked data communities Committee of Principals for RDA agrees to develop linked data representation of RDA 2014: v1.0.0 of RDA Vocabularies on GitHub 2015: RDA Board strategy includes linked data communities February 24, 2019

RDF Resource Description Framework (RDF) Designed for machine-processing of metadata at global scale (Semantic Web) 24/7/365 Trillions of operations per second Everything must be dis-ambiguated Machines are dumb A simple approach helps! Require machine-readable identifiers February 24, 2019

RDF triple Simple, single, “atomic” statement in 3 parts subject – predicate (property) – object This slide – has title – “RDF triple” Subject and predicate must be identified by a URI or IRI* Unambiguous machine identification (a thing) Object may be an IRI or a literal Literal: human-readable string * Internationalized resource identifier February 24, 2019

RDF graph Graphical representation of one or more triples Property IRI Subject IRI Object IRI Property IRI Subject IRI “Literal” Object1 = Subject2 Property1 Property2 Subject1 Object2 Property3 “Literal” February 24, 2019

RDA in RDF RDA uses RDF to represent RDA Reference (entities, elements, and controlled vocabularies) Provides data for RDA Toolkit (Glossary, element reference, navigation) Available from RDA Registry for external applications open license: CC0 BY February 24, 2019

Toolkit element page Definition and Scope Element Reference February 24, 2019 Toolkit element page Definition and Scope Element Reference Prerecording Recording Recording an unstructured description Recording a structured description Recording an identifier Recording an IRI This is an outline of the element page structure. The RDA Reference data are displayed in the sections highlighted in gray. All of these sections use content that has already been translated in the Open Metadata Registry. The guidance and instructions are displayed in the sections highlighted in orange. The content of these sections is translated in the Content Management System using Trados. This allows translators to focus their work on specific areas of Toolkit content. Instructions RDA Reference Related Elements February 24, 2019

RDA Vocabularies RDA Reference: entities (classes), elements (properties), and terms (concepts) Includes translations (12+ languages) Published via GitHub and RDA Registry open license: CC0 BY February 24, 2019

https://github.com/RDARegistry/RDA-Vocabularies/releases February 24, 2019

RDA Releases Semantic versioning Break.Bend.Minor (n.n.n) GitHub pre-releases used to test production infrastructure for new Toolkit Warning: unstable! February 24, 2019

RDA Releases 2.7.3: Original Toolkit (April 2017) Pre-releases: 3.0.1 – 3.0.11 3 !!!: Breaks semantics of 2.7.3 Re-definition of Person entity (LRM) 3.1.0: real soon now (December 2018?) February 24, 2019

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Property domain & range Property domain specifies the expected entity (class) of a triple subject Property range specifies the expected entity (class) of a triple object No domain or range = no expectations February 24, 2019

Recording methods "Unstructured description" Datatype property unconstrained property (no domain, no range) external property (non-LRM) subPropertyOf "Unstructured description" Datatype property (literal range) "Structured description" canonical property (no range) subPropertyOf "Identifier" Object property (entity range) IRI

Maps to related linked data New!: Dublin Core Terms February 24, 2019

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Conclusion RDA provides a complete package for linked data applications RDF elements Content instructions Maps to related standards Extension mechanism for local applications February 24, 2019

Muchas gracias! RDA Registry http://www.rdaregistry.info/ February 24, 2019 Muchas gracias! RDA Registry http://www.rdaregistry.info/ RDA Vocabularies https://github.com/RDARegistry/RDA-Vocabularies RDA Steering Committee http://www.rda-rsc.org/ RDA Toolkit: https://www.rdatoolkit.org/ February 24, 2019

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