Digital Enterprise Research Institute                                                      www.deri.ie                    ...
Digital Enterprise Research Institute                    www.deri.ie                            VoID                    Vo...
W3C Interest Group noteDigital Enterprise Research Institute                                    www.deri.ie               ...
Digital Enterprise Research Institute          www.deri.ie       “What business-related datasets are        in the LOD Clo...
Read …Digital Enterprise Research Institute                                                      www.deri.ie              ...
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?        Example...
DatasetsDigital Enterprise Research Institute                                www.deri.ie            A dataset is a set of...
LinksetsDigital Enterprise Research Institute                                 www.deri.ie            An RDF link is an RD...
voiD schemaDigital Enterprise Research Institute                       www.deri.ie                                        ...
General dataset metadataDigital Enterprise Research Institute       www.deri.ie            Leveraging DublinCore:        ...
General dataset metadataDigital Enterprise Research Institute   www.deri.ie
Access metadataDigital Enterprise Research Institute                  www.deri.ie            How to access the actual RDF...
Access metadataDigital Enterprise Research Institute   www.deri.ie
Structural metadataDigital Enterprise Research Institute                             www.deri.ie            High-level in...
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  ...
UsersDigital Enterprise Research Institute                    www.deri.ie            Used by DBpedia, OpenLink, data.gov....
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         ...
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VoID: Metadata for RDF Datasets

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VoID: Metadata for RDF Datasets

  1. 1. 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.
  2. 2. Digital Enterprise Research Institute www.deri.ie VoID Vocabulary of Interlinked Datasets
  3. 3. W3C Interest Group noteDigital Enterprise Research Institute www.deri.ie http://www.w3.org/TR/void/ 3
  4. 4. 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?”
  5. 5. Read …Digital Enterprise Research Institute www.deri.ie http://esw.w3.org/TaskForces/CommunityProjects/LinkingOpenData/DataSets
  6. 6. Click …Digital Enterprise Research Institute www.deri.ie
  7. 7. Sindice …Digital Enterprise Research Institute www.deri.ie
  8. 8. Google …Digital Enterprise Research Institute www.deri.ie
  9. 9. And even if we find a dataset …Digital Enterprise Research Institute www.deri.ie
  10. 10. 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?
  11. 11. 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
  12. 12. 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
  13. 13. voiD schemaDigital Enterprise Research Institute www.deri.ie Statistics Interlinking General metadata
  14. 14. General dataset metadataDigital Enterprise Research Institute www.deri.ie  Leveraging DublinCore:  Dataset homepage  Publisher  Title and description  Categorisation  Licensing  Technical features
  15. 15. General dataset metadataDigital Enterprise Research Institute www.deri.ie
  16. 16. 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
  17. 17. Access metadataDigital Enterprise Research Institute www.deri.ie
  18. 18. 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
  19. 19. Structural metadataDigital Enterprise Research Institute www.deri.ie
  20. 20. Describing linksetsDigital Enterprise Research Institute www.deri.ie
  21. 21. Describing linksetsDigital Enterprise Research Institute www.deri.ie
  22. 22. Digital Enterprise Research Institute www.deri.ie Deployment and Discovery
  23. 23. Alongside a datasetDigital Enterprise Research Institute www.deri.ie
  24. 24. Digital Enterprise Research Institute www.deri.ie  Publishing aVoIDfile alongside a dataset  Turtle  RDFa  Discovery (well-known URI)  http://yoursite/.well-known/void
  25. 25. 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
  26. 26. ApplicationsDigital Enterprise Research Institute www.deri.ie 26
  27. 27. Ed Summers’ LOD GraphDigital Enterprise Research Institute www.deri.ie
  28. 28. 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

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