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Presentation for the Open Data Masterclass organized by Kennisland at the Koninklijke Bibliotheek, 9 Oct, 2012
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Europeana and Linked Open Data
Antoine Isaac, Europeana
Open Data Masterclass, KB
9 October 2012
Building a search engine on top of metadata is difficultTraditional metadata quality problems: correctness, coverage
Especially when data is so heterogeneous100s of formats, multilingual data
We currently use a simple flat interoperability format (ESE)
Making metadata work for Europeana
More semantics-enabled services
Enhance access by semanticsQuery expansion, clustering of results
Exploiting various relations: "located in", “more specific concept"…
Goal: to make richer data and services available to us and others
Semantics are already there, in original metadataThesauri, classifications…
ESE loses information
Building a "semantic layer” context
Linked Data principles
1. Use URIs as names for things
2. Use HTTP URIs so that people can look up those names
3. When someone looks up a URI, provide useful information using standards (RDF, SPARQL)
4. Include links to other URIs, so that they can discover more things
Tim Berners-Lee http://linkeddata.org/
Example
http://data.europeana.eu/proxy/europeana/92037/25F9104787668C4B5148BE8E5AB8DBEF5BE5FE03
Leading to HTML page for humans
Leading to data for software agents
Also contextual resources
Contextual resources lead to data too
Matches interest for linked data in libraries, archives and museums
• Library Linked Data W3C Community Grouphttp://www.w3.org/2005/Incubator/lld/XGR-lld/
• LOD-LAM communityhttp://lod-lam.net
• IFLA Semantic Web grouphttp://www.ifla.org/en/swsig
LLD - General benefits of linked data
• ShareableGlobally unique resolvable identifiers – URI
• Extensible"Open world" - no description is complete, anybody can add descriptive
information about the same thingAnnotations, enrichments, etc.
• Standard protocols/techniques vs. domain-specific onesHTTP, RDF, REST
Etc.
http://www.w3.org/2005/Incubator/lld/XGR-lld/
Available Linked Library Data
http://www.w3.org/2005/Incubator/lld/XGR-lld-vocabdataset/
Available Library Linked Data
• Element sets/schemas/ontologiesSKOS, Dublin Core, OAI-ORE…
• Value vocabularies/thesauri/authority listsLCSH, VIAF…
• DatasetsBritish Library, Chronicling America…
Europeana and Linked Data
Provide trusted, reference data for cultural objects
Promote the use of the technology
Promoting the exchange of data in the community and with third parties: Open (meta)data!
http://vimeo.com/36752317
Europeana and Linked Data
Some steps in production services
Re-use and linking
Currently: GeoNames, GEMET…
Data re-use can be serendipitous!
From our domain (VIAF, UDC) or others (Eurovoc)
Multilingual resources are key for us
Europeana Data Model
• Representing objects & others: persons, places...
• Linking to internal or external data sources
• Separating original data from enrichments
• Enabling domain-specific data profiles
• Model re-uses existing vocabularies
http://pro.europeana.eu/edm-documentation
What is submitted to Europeana?
1. Thumbnails1. Thumbnails
2. Metadata2. Metadata
3. Links to digital objects online3. Links to digital objects online
Exemple
22
EDM data
Europeanaaggregation
“enriched”metadata
The “real” painting
DMF creator
DMF aggregation
digital representation
digital representation
data.europeana.eu
Europeana Linked Open Data Pilot
• Fully open metadata
• 2.4 M objects
• 200 individual providers
• 15 countries
data.europeana.eu
September 2012
• Europeana new Data Exchange Agreement apply
• Entire metadata is CC0
• Provided as dump files