VoID: Metadata for RDF Datasets
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VoID: Metadata for RDF Datasets

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VoID: Metadata for RDF Datasets VoID: Metadata for RDF Datasets Presentation Transcript

  • Digital Enterprise Research Institute www.deri.ie VoID – Metadata for RDF datasets Richard Cyganiak, Linked Data Research Centre Stefan.Decker@deri.org http://www.StefanDecker.org/ Copyright 2010 Digital Enterprise Research Institute. All rights reserved.
  • Digital Enterprise Research Institute www.deri.ie VoID Vocabulary of Interlinked Datasets
  • W3C Interest Group noteDigital Enterprise Research Institute www.deri.ie http://www.w3.org/TR/void/ 3
  • Digital Enterprise Research Institute www.deri.ie “What business-related datasets are in the LOD Cloud?” “Which datasets deal with politics and transparency in the EU?” “We have some DERI data. What could we link it to?”
  • Read …Digital Enterprise Research Institute www.deri.ie http://esw.w3.org/TaskForces/CommunityProjects/LinkingOpenData/DataSets
  • Click …Digital Enterprise Research Institute www.deri.ie
  • Sindice …Digital Enterprise Research Institute www.deri.ie
  • Google …Digital Enterprise Research Institute www.deri.ie
  • And even if we find a dataset …Digital Enterprise Research Institute www.deri.ie
  • Standard questionsDigital Enterprise Research Institute www.deri.ie  What kind of data is there?  Examples?  Is it up to date?  Who publishes it?  Where is the SPARQL endpoint?  Is there a download?  How big is it?  What’s the license?
  • DatasetsDigital Enterprise Research Institute www.deri.ie  A dataset is a set of RDF triples that are published, maintained or aggregated by a single provider
  • LinksetsDigital Enterprise Research Institute www.deri.ie  An RDF link is an RDF triple whose subject and object are described in different datasets  A linksetis a collection of such RDF links between two datasets
  • voiD schemaDigital Enterprise Research Institute www.deri.ie Statistics Interlinking General metadata
  • General dataset metadataDigital Enterprise Research Institute www.deri.ie  Leveraging DublinCore:  Dataset homepage  Publisher  Title and description  Categorisation  Licensing  Technical features
  • General dataset metadataDigital Enterprise Research Institute www.deri.ie
  • Access metadataDigital Enterprise Research Institute www.deri.ie  How to access the actual RDF triples:  SPARQL endpoints  RDF data dumps  Root resources  URI lookup endpoints  OpenSearch description documents
  • Access metadataDigital Enterprise Research Institute www.deri.ie
  • Structural metadataDigital Enterprise Research Institute www.deri.ie  High-level information about schema and internal structure of a dataset  Can be helpful when exploring or querying datasets  Example resources  Patterns for resource URIs  Vocabularies  Dataset partitions  Statistics
  • Structural metadataDigital Enterprise Research Institute www.deri.ie
  • Describing linksetsDigital Enterprise Research Institute www.deri.ie
  • Describing linksetsDigital Enterprise Research Institute www.deri.ie
  • Digital Enterprise Research Institute www.deri.ie Deployment and Discovery
  • Alongside a datasetDigital Enterprise Research Institute www.deri.ie
  • Digital Enterprise Research Institute www.deri.ie  Publishing aVoIDfile alongside a dataset  Turtle  RDFa  Discovery (well-known URI)  http://yoursite/.well-known/void
  • UsersDigital Enterprise Research Institute www.deri.ie  Used by DBpedia, OpenLink, data.gov.uk, …  30% of LOD datasets have VoID metadata  The entire LOD Cloud described inVoID:  semantic.ckan.net
  • ApplicationsDigital Enterprise Research Institute www.deri.ie 26
  • Ed Summers’ LOD GraphDigital Enterprise Research Institute www.deri.ie
  • SummaryDigital Enterprise Research Institute www.deri.ie  Metadata for linked datasets  For the 4-5 star datasets  W3C Interest Group note (VoID 2) http://www.w3.org/TR/void/  Leverages Dublin Core, FOAF, etc.  Used by DBpedia, OpenLink, data.gov.uk, …  Used to generate the LOD Cloud diagram  The entire LOD Cloud described in VoID:  semantic.ckan.net 28