developing linked open data - nuno freire, senior researcher, the european library
TRANSCRIPT
Developing Linked Open Data
Nuno Freire
The European Library Annual MeetingAmsterdam, September 2013
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
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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
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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)
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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
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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
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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
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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
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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
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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
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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
