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LDBC 19 November 2013


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An introduction to the Europeana Data Model and services in the context of creating benchmarks for a cultural heritage data set. Presented at the Linked Data Benchmark Council Technical User Committee in London in November 2013.

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LDBC 19 November 2013

  1. 1. Europeana and Open Data Robina Clayphan Interoperability Manager, Europeana LDBC TUC meeting, 19 November, 2013
  2. 2. What is Europeana? • Europeana is a service that brings together digital content from across the cultural heritage domain in Europe • It makes the metadata freely available • It is a catalyst for change in the world of cultural heritage. • Our vision: We believe in making cultural heritage openly accessible in a digital way, to promote the exchange of ideas and information.
  3. 3., Europe’s cultural heritage portal - A network of participants in development and innovation - Nearly 30 million objects from 2,400 European galleries, museums, archives and libraries Libraries National Aggregators Regional Aggregators Archives Museums Thematic collections
  4. 4. What types of objects does Europeana give access to? Text Image Video Sound 3D
  5. 5. Europeana and open data
  6. 6. What Europeana makes available Metadata Link to digital objects online
  7. 7. Two categories of rights Metadata (descriptive object information) CC Different options: Open – not fully open (but clear) – Not open
  8. 8. The Europeana Data Model
  9. 9. EDM requirements & principles 1. Distinction between “provided objects” (painting, book, movie, etc.) and their digital representations 2. Distinction between objects and metadata records describing an object 3. Allow for multiple records for a same object, containing potentially contradictory statements about it 4. Support for objects that are composed of other objects 5. Support for contextual resources, including concepts from controlled vocabularies Richer metadata with finer granularity
  10. 10. Provide more semantics to the data Build a semantic layer on top of Cultural Heritage objects
  11. 11. EDM Classes
  12. 12. The three core classes An aggregation with a provided CHO and a web resource edm:ProvidedCHO ore:Aggregation edm:aggregatedCHO (Identifier of real object) (Identifier of aggregation) edm:hasView edm:WebResource (Identifier of web resource)
  13. 13. The Aggregation with metadata
  14. 14. Properties for the Aggregation The aggregation represents the set of related resources about one real object contributed by one provider. It carries the metadata that is about the whole set Mandatory: Optional: edm:aggregatedCHO edm:hasView edm:dataProvider edm:object edm:isShownBy or dc:rights edm:isShownAt edm:ugc edm:provider edm:rights
  15. 15. Properties for the ProvidedCHO The ProvidedCHO is the cultural heritage object which is the subject of the package of data that has been submitted to Europeana. Properties: dc:contributor, dc:coverage, dc:creator, dc:date, dc:description, dc:format, dc:identifier, dc:language, dc:publisher, dc:relation, dc:rights, dc:source,dc:subject, dc:title, dc:type, 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 edm:isNextInSequence edm:isDerivativeOf edm:currentLocation…
  16. 16. Properties for the web resource One or more digital representations of the provided cultural heritage object. dc:description dc:format dc:rights dc:source dcterms:conformsTo dcterms:created dcterms:extent dcterms:hasPart dcterms:isFormatOf dcterms:isPartOf dcterms:issued edm:isNextInSequence edm:rights
  17. 17. EDM Classes
  18. 18. Contextual classes Representing (real-world) entities related to a provided object as fully fledged resources, not just strings edm:Agent skos:Concept foaf:name skos:prefLabel skos:altLabel skos:altLabel rdaGr2:biographicalInformation skos:broader rdaGr2:dateOfBirth…. skos:definition…. edm:TimeSpan edm:Place skos:prefLabel dcterms:isPartOf edm:begin edm:end…. wgs84_pos:lat wgs84_pos:long skos:prefLabel dcterms:isPartOf….
  19. 19. Example of a CHO with two contextual classes "D a rw in , C h a rle s " "1 2 -0 2 -1 8 0 9 " dc:creator edm:Agent [identifier for person resource] "1 2 -0 4 -1 8 8 2 " edm:ProvidedCHO [id e n ti fi e r fo r "re a l" o b je c t] dc:subject "E v o lu tio n "@ e n skos:Concept [identifier for subject resource] "É v o lu tio n "@ fr
  20. 20. Accessing and re-using Europeana data
  21. 21. How do users access Europeana content? Europeana aims to provide content in the users’ workflow – where they want it, when they want it. User focused channels: portal, social media exports For programmers: API, search widget, semantic mark up, LOD pilot
  22. 22. Europeana’s infrastructure is open for re-use Europeana data available via     API Search widgets Semantic mark-up ( on portal Linked Open Data pilot
  23. 23. Some (approximate) numbers Europeana database – 30 Million objects LOD pilot – a subset of 20 Million objects • • contained nearly 1 Billion RDF explicit statements • Ontotext has already loaded a chunk of data and is working on the update of it, in Europeana Creative. 4 Billion once you do all the RDF reasoning (sub-properties, sub-classes, etc) in OWLIM
  24. 24. Possible benchmarking queries? Queries for exploring the dataset • e.g. to generate the complete ordered list of Europeana aggregators and the data providers they gather Queries for exploring the objects • e.g. a list of works with a matching location/creator/title • Simple graph traversal Expressing EDM constraints (that cannot be done in OWL) • Can RDF validation help e.g where at least one of two properties must be present (title or description)? Queries to assist in data quality improvement • Broken links, duplicates (or near duplicates), missing mandatory properties, missing thumbnails etc etc For Information: We are starting a data quality task force if you are interested!
  25. 25. Useful links  Europeana portal  Europeana Professional • EDM documentation • Europeana API • LOD pilot       Data Quality task force – Europeana Professional blog Facebook Twitter Europeana Thought Lab Europeana end-user blog
  26. 26. Thank you Robina Clayphan
  27. 27. Bonus slides!
  28. 28. EDM design requirements  Compatibility with different levels of description • Allow different levels of granularity • A book, a page, a detail of an image  Standard metadata format that can be specialized • Allow the specification of domain specific application profiles • Enable the re-use of existing standards • Allow the extension of the initial model
  29. 29. EDM basis  OAI ORE (Open Archives Initiative Object Reuse & Exchange) for organizing an object’s metadata and digital representation(s)  Dublin Core for descriptive metadata  SKOS (Simple Knowledge Organization System) for conceptual vocabulary representation  CIDOC-CRM for the modeling of event and relationships between objects  Use the Semantic Web representation principles • • • RDF Re-use and mix different vocabularies together Preserve original data and still allow for interoperability
  30. 30. EDM Properties (excluding ESE)
  31. 31. Two providers and two aggregations (the same object) provenance metadata v aggregation of DMF aggregation of Louvre Cultural heritage object 31 provenance metadata
  32. 32. Landing page Europeana aggregation Enriched metadata