Developing linked Open Data - Nuno Freire, Senior Researcher, The European Library

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  • 1. Developing Linked Open Data Nuno Freire The European Library Annual Meeting Amsterdam, September 2013
  • 2. Outline  Challenges in developing LOD at The European Library • Which data to publish as LOD? • Which data model to follow? • Linking metadata  Current status  Next steps
  • 3. 3 Challenges in Developing LOD at The European Library  Bibliographic Data arrives in several data models  Different levels of data detail: • From detailed MARC data to simple Dublin Core data  Different definitions of ‘restricted metadata’ by partner libraries  Some libraries already publish their data as LOD
  • 4. 4 Which data to publish as LOD?  Data about the member libraries and other organizations contributing data to The European Library  Descriptions of all the collections available in The European Library Portal  The bibliographic resources • Including metadata enrichments performed at The European Library  Multilingual Access to Subjects MACS (currently under consideration)
  • 5. 5 Which data model to follow?  Many options are available: • RDA, ISBD, FRBR element sets and vocabularies from the Open Metadata Registry • CIDOC Conceptual Reference Model and FRBRoo • Bibliographic Framework Initiative - BIBFRAME • Europeana Data Model
  • 6. 6 Linking Metadata (1/2)  Linking bibliographic data is already being done for the portal: • Persons, Organizations are linked to VIAF • Places are linked to Geonames • Subject Heading linked to MACS • Bibliographic records are linked within The European Library collection • At manifestation level • At work level • ... but linking for information retrieval is different from linking for LOD • Links need to be accurate • Linking methods need to be adapted for LOD
  • 7. 7 Linking Metadata (2/2)  External dataset priorities for linking • Library of Congress Linked Data Service • Subject headings, languages, countries, relator codes, cultural heritage organizations, ... • Subject Heading Systems / Authority Files • RAMEAU, The Gemeinsame Normdatei, Library of Congress Subject Headings • Publication of MACS as LOD is being considered • LOD data sets at partner libraries
  • 8. 8 Outcomes for Libraries  Provides a presence in the Web of Data • For those already present: • Provides additional links to their LOD data sets • Provides extra links and metadata enrichments provided by The European Library  Provides a mechanism for sharing with libraries any metadata improvements performed by The European Library
  • 9. 9 Current Status (1/2)  Linked Data Platform is in place • Data dumps • Portal and data.theeuropeanlibrary.org support LOD Content Negotiation according to W3C Linked Data Platform 1.0 • ... SPARQL endpoint may not be possible to provide  Only a minor part of the data aggregated by The European Library is available • Around 6 million bibliographic resources • Publication of more data is pending on the Partnership Agreements to be ready
  • 10. 10 Current Status (2/2)  Current LOD implementation follows a data model based on the Europeana Data Model • This model based in the analysis of library data in the context of EDM (Europeana Libraries project) • The model uses classes and properties from the following vocabularies: • Europeana Data Model • RDA Group 2 Elements • Dublin Core / Dublin Core Terms • SKOS Simple Knowledge Organization System • WGS84 Geo Positioning • OAI ORE Terms • FOAF • ISO 639-2 Languages • Multilingual Dictionary of Cataloguing Terms and Concepts
  • 11. 11 Next Steps  Conduct discussions within the Technical Working Group: • Identify existing LOD data sets from partners • Elaboration of the data model • Identify external data sets for linking to • Work with interested libraries in validating the implementation • Identify other data oriented services that TEL may provide to libraries • ISNI, Subject Headings (MACS)  At The European Library • Prepare the LD platform for the ‘restricted metadata’ definitions received from libraries • Prepare the next pilot release for December 2013
  • 12. Thank you for your attention Contact: nuno.freire@kb.nl