A Lightening Talk at the DevCSI Linked Data Hackday

Glaser, Hugh

English

Southampton (e-Prints Soton)

© 2010 Seme4  Seme4.com Seme4 18 Soho Square London W1 3QL T : + 44 20 7060 1590 Co-reference and sameAs.org Hugh Glaser Seme4 Limited and University of Southampton, UK  DevCSI Linked Data Hackdays ILRT, Bristol, UK, 14th January 2011 h p://eprints.ecs.soton.ac.uk/id/eprint/21897	 ﾠ© 2010 Seme4  Seme4.com The LOD “cloud” 2  Linking Open Data cloud diagram, by Richard Cyganiak and Anja Jentzsch. http://lod-cloud.net/ © 2010 Seme4  Seme4.com Co-Reference •  Lots of resources with multiple URIs –  This is the nature of the Beast –  Legal, Sociological and Technical reasons •  This is a Big Problem –  Everything is a URI (not title, name, number…) –  Identifying multiple URIs for one resource –  Rejecting incorrectly conﬂated resources –  Publishing –  Using •  Solution –  Co-reference is just Knowledge, but quite special, and crucial, knowledge –  Generating a new URI is not the solution to already having too many –  The web is anarchic – donʼt try to impose impossible structure on it –  Embrace the anarchy and multiple URIs in your systems ab initio 3 © 2010 Seme4  Seme4.com Co-Reference Service (CRS) •  CRS Subsystem –  Find co-references –  Store them –  Publish them •  Essentially: •  URIi -> { URI1, …, URIi, …, URIn } –  Recommend a “Canon” •  Published by the Data Publisher –  And possibly others •  Middleware aggregates co-references from recognised CRSes 4 © 2010 Seme4  Seme4.com CRS continued •  CRS Policies are deﬁned by context –  Often one per Triplestore –  Can be many per Triplestore for different purposes –  May not be associated with a particular Triplestore •  Maintenance –  Provenance –  Rollback •  Can be used to infer owl:sameAs •  Eg OAI CRS has –  7531045 different URIs –  in –  2544955 bundles 5 © 2010 Seme4  Seme4.com Look up Seungwoo 6 © 2010 Seme4  Seme4.com Co-Reference Closure 7 © 2010 Seme4  Seme4.com 8 © 2010 Seme4  Seme4.com 9 © 2010 Seme4  Seme4.com What is Southampton? 10 © 2010 Seme4  Seme4.com Concluding Remarks •  RKBExplorer uses CRS services successfully –  Often 100s of URIs per person •  British Museum uses a CRS service for Data Fusion on its web site •  Organisations can go ahead and build systems, then do the identity management –  Both internally and externally –  Doing identity management ﬁrst requires cross-organisation agreement, a delay of months to years –  It then freezes the business processes to conform to the external requirement •  sameAs.org turns out to be pretty useful –  > 10K hits/day •  Build systems that accept the way the world is, not what you would like it to be 11 © 2010 Seme4  Seme4.com You are never alone •  Ian Millard •  ReSIST Project •  AKT Project •  EnAKTing Project •  10 years of collaborators 12 h p://eprints.ecs.soton.ac.uk/id/eprint/21897	 ﾠ

Co-reference and sameAs.org

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