Europeana as a Linked Open Data case (in progress)
Antoine Isaac
ISKO UK Seminar “Making Metadata Work”
London, June 23, 2014
Europe’s platform to access cultural heritage
Currently33M objects
Built on descriptive metadatafrom a broad, heterogeneous network
Audiovisual collections
National Aggregators
Regional Aggregators
Archives
Thematic collections
Libraries
Musées Lausannois
Culture.frThe European Library
APEX
European Film Gateway Europeana Fashion
2,300 galleries, museums, archives and libraries
What Europeana gets (and makes available)
Descriptive metadata
Link to digital objects online
A distribution channel
Linked Open Data?
http://vimeo.com/36752317
Realizing Linked Data bits by bits
Incremental progress on Europeana’s various facets
Data ingestion
Data enrichment
Front-end services: search, display
Data publication
Making metadata work better
Creating a new Europeana Data Model: EDM
http://pro.europeana.eu/edm-documentation
Prior to EDM: flat metadata records
dc:contributor, dc:creator, dc:date, dc:format, dc:identifier, dc:language, dc:publisher, dc:relation, dc:source, dcterms:alternative, dcterms:extent, dcterms:temporal, dcterms:medium, dcterms:created, dcterms:provenance, dcterms:issued, dcterms:conformsTo, dcterms:hasFormat, dcterms:isFormatOf, dcterms:hasVersion, dcterms:isVersionOf, dcterms:hasPart, dcterms:isPartOf, dcterms:isReferencedBy, dcterms:references, dcterms:isReplacedBy, dcterms:replaces dcterms:isRequiredBy, dcterms:requires dcterms:tableOfContents
europeana:type, europeana:dataProvider, europeana:provider, europeana:isShownAt, europeana:isShownBy, europeana:object, europeana:rights
No links between objects and persons, places…
Mixing data on real object and digital content
Causing a lot of mapping quality problems
EDM: an example
http://europeana.eu/portal/record/09102/_CM_0161930.html
More granular metadata
Contextual Resources – Places
Collaborative, soft standardization
Cross-community development, involving library, archive and museum experts and academic partners
Data model that re-uses several existing models
Semantic Web paradigm just allows mixing them!
(Future work:) Different semantic grains
Adopts Semantic Web principle of specializing classes and properties
Enables extensions, “applications profiles”, based on needs and best practices from specific sectors or domains
Ready for metadata enrichment
Europeana links objects to third-party sources
• GEMET, GeoNames, DBpedia
Europeana providers send richer metadata
Harvesting thesauri as linked data
Contextual resources – multilingual & semantic linked data for Concepts
<skos:Concept rdf:about="http://www.mimo-db.eu/InstrumentsKeywords/2251"> <skos:prefLabel xml:lang="">Harpsichord</skos:prefLabel> <skos:prefLabel xml:lang="de">Cembalo</skos:prefLabel> <skos:prefLabel xml:lang="sv">Cembalo</skos:prefLabel> <skos:prefLabel xml:lang="fr">Clavecin</skos:prefLabel> <skos:prefLabel xml:lang="it">Clavicembalo</skos:prefLabel> <skos:prefLabel xml:lang="en">Harpsichord</skos:prefLabel> <skos:prefLabel xml:lang="nl">Klavecimbel</skos:prefLabel> <skos:broader> <skos:Concept rdf:about="http://www.mimo-db.eu/InstrumentsKeywords/2239"/> </skos:broader></skos:Concept>
Contextual resource benefits - Work in progress
Allows to present users with richer context
Boosts multilingual search
And multilingual display
Linked-data compatible data re-use channels
Search API
Results in JSON, JSON-LD, RDF/XML
Semantic mark-up on portal
schema.org, OpenGraph
Linked Open Data prototype
Content negotiation, RDF dumps, SPARQL endpoint
Content - digital objects on the site of the provider
Metadata - descriptive object information
Different options
The legal side of data
CC
Europeana and partners provide open metadata
Technological advocacy hand in hand with legal advocacy
http://vimeo.com/36752317
<slight digression>
On practical aspects of enhancing semantic interoperability using SKOS and KOS alignment
Antoine ISAAC
KRR lab, Vrije Universiteit Amsterdam
National Library of the Netherlands
ISKO UK Meeting, July 21 2008, London
Enhancing semantic interoperability using SKOS
Conclusion
• Representing KOSs using SKOS• Main features
• Practical issues
• Demo
• SKOS and semantic alignment of KOSs
Despite some issues, SKOS provides a crucial contribution to enhance interoperability of KOSs
SKOS and Linked Data
Antoine Isaac
ISKO, London, Sept. 14th 2010
Conclusion
Publication and linking of linked KOS data is still work in progress, but
• We are now in position of realizing the issues and working towards solving them
• We can start building applications that make use of the wealth of data already available or yet to comeMany KO resources to re-use and link to
Now: Getty Art and Architecture Thesaurus in SKOS Linked Open Data!
http://www.getty.edu/research/tools/vocabularies/lod/
Now: Getty AAT in Europeana
http://europeana.eu/portal/record/2023004/24062A23_priref_229.html
Now: Getty AAT in Europeana
http://europeana.eu/portal/record/2023004/24062A23_priref_229.html
</slight digression>
Still many R&D efforts
EuropeanaTechcommunity
pro.europeana.eu/europeana-tech
Innovation - Searching
http://eculture.cs.vu.nl/europeana/
Innovation - Annotation
Pundit @ DM2E project http://dm2e.eu
Conclusions
Linked data presents big opportunities and challenges for Europeana and its partners
Not implementing the full technical stack at once already bring benefits
Useful links
Europeana portal europeana.eu
EuropeanaTech community pro.europeana.eu/europeana-tech
Europeana Data Model documentation pro.europeana.eu/edm-documentation
Europeana Twitter @EuropeanaEU
EuropeanaTech Twitter @EuropeanaTech