VoID: Metadata for RDF Datasets
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This document describes VoID (Vocabulary of Interlinked Datasets), which is a metadata vocabulary for describing linked datasets and linksets between datasets. VoID allows datasets to provide information about structural metadata, access points, statistics, and interlinking between other datasets. It has been adopted by many datasets in the Linked Open Data cloud.
VoID: Metadata for RDF Datasets
- 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. Digital Enterprise Research Institute www.deri.ie VoID Vocabulary of Interlinked Datasets
- 3. W3C Interest Group note Digital Enterprise Research Institute www.deri.ie http://www.w3.org/TR/void/ 3
- 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. Read … Digital Enterprise Research Institute www.deri.ie http://esw.w3.org/TaskForces/CommunityProjects/LinkingOpenData/DataSets
- 6. Click … Digital Enterprise Research Institute www.deri.ie
- 7. Sindice … Digital Enterprise Research Institute www.deri.ie
- 8. Google … Digital Enterprise Research Institute www.deri.ie
- 9. And even if we find a dataset … Digital Enterprise Research Institute www.deri.ie
- 10. Standard questions Digital 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. Datasets Digital 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. Linksets Digital 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. voiD schema Digital Enterprise Research Institute www.deri.ie Statistics Interlinking General metadata
- 14. General dataset metadata Digital Enterprise Research Institute www.deri.ie Leveraging DublinCore: Dataset homepage Publisher Title and description Categorisation Licensing Technical features
- 15. General dataset metadata Digital Enterprise Research Institute www.deri.ie
- 16. Access metadata Digital 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. Access metadata Digital Enterprise Research Institute www.deri.ie
- 18. Structural metadata Digital 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. Structural metadata Digital Enterprise Research Institute www.deri.ie
- 20. Describing linksets Digital Enterprise Research Institute www.deri.ie
- 21. Describing linksets Digital Enterprise Research Institute www.deri.ie
- 22. Digital Enterprise Research Institute www.deri.ie Deployment and Discovery
- 23. Alongside a dataset Digital Enterprise Research Institute www.deri.ie
- 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. Users Digital 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. Applications Digital Enterprise Research Institute www.deri.ie 26
- 27. Ed Summers’ LOD Graph Digital Enterprise Research Institute www.deri.ie
- 28. Summary Digital 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