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when the link makes sense

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introduction on semantic web: linking data and schemas on the web

introduction on semantic web: linking data and schemas on the web

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  • 1. when the link makes sense semantic web: linking data and schemas on the web fabien, gandon, @fabien_gandon, http://fabien.info
  • 2. le web originel liens typés…
  • 3. SEMANTIC WEB STANDARD STACK W3C®
  • 4. A WEB OF LINKED DATA W3C®
  • 5. RDF is a triple model i.e. every piece of knowledge is broken down into ( subject , predicate , object )
  • 6. doc.html has for author Fabien and has for theme Music
  • 7. doc.html has for author Fabien doc.html has for theme Music
  • 8. RDFtriples can be seen as arcs of a graph (vertex,edge,vertex) (the RDF data model can be seen as a directed labelled multigraph)
  • 9. Fabien author doc.html theme Music
  • 10. identify what exists on the web http://my-site.fr identify, on the web, what exists http://animals.org/this-zebra
  • 11. http://ns.inria.fr/fabien.gandon#me http://inria.fr/schema#author http://inria.fr/rr/doc.html http://inria.fr/schema#theme "Music"
  • 12. http://ns.inria.fr/fabien.gandon#me http://inria.fr/schema#author http://inria.fr/rr/doc.html http://inria.fr/rr/doc.html http://inria.fr/schema#theme Music
  • 13. open and link data in a global giant graph
  • 14. < RDF /> has an XML syntax RDF has other syntaxes (Turtle, JSON-LD, Triple)
  • 15. ratatouille.fr
  • 16. datatouille.fr
  • 17. HTTP URI GET 303 GET HTML,RDF,… linked data principles  Use RDF as data format  Use HTTP URIs as names for things so that people can look up those names  When someone looks up a URI, provide useful information (RDF, HTML, etc.) using content negotiation  Include links to other URIs so that related things can be discovered
  • 18. May 2007 April 2008 September 2008 Linking Open Data March 2009 400 300 200 100 0 10/10/2006 28/04/2007 14/11/2007 01/06/2008 18/12/2008 06/07/2009 22/01/2010 10/08/2010 26/02/2011 14/09/2011 01/04/2012 September 2011 Linking Open Data cloud diagram, by Richard Cyganiak and Anja Jentzsch. http://lod-cloud.net/ September 2010
  • 19. thematic content Number of datasets Number of Triples % Out links % Media 25 1 841 852 061 5,82 % 50 440 705 10,01 % Geography 31 6145 532 484 19,43 % 35 812 328 7,11 % Government 49 13 315 009 400 42,09 % 19 343 519 3,84 % Publications 87 2 950 720 693 9,33 % 139 925 218 27,76 % Inter-domain 41 4 184 635 715 13,23 % 63 183 065 12,54 % Life Sciences 41 3 036 336 004 9,60 % 191 844 090 38,06 % Users’ content 20 134 127 413 0,42 % 3 449 143 0,68 % 295 31 634 213 770 Domains 503 998 829 0% 9% 6% 42% 10% Government Geography Inter-domain 13% Life Sciences Publications 20% Media Users' content
  • 20. query with SPARQL SPARQL Protocol and RDF Query Language
  • 21. e.g. DBpedia
  • 22. HTTP SPARQL
  • 23. Linked Data Platform REST like access to LD resources & containers HTTP for accessing, updating, creating and deleting resources from linked data servers. PUT http://data.inria.fr/people/fab Host: data.inria.fr Content-Type: text/turtle HTTP/1.1 <fab> a foaf:Person ; rdfs:label "Fabien" ; foaf:mbox <fabien.gandon@inria.fr> .
  • 24. don’t read the sign
  • 25. you loose!
  • 26. we identify and interpret information, machines don’t.
  • 27. 180°C+ =?  publish the data schemas + = 
  • 28. semantic web mentioned by Tim BL in 1994 at WWW [Tim Berners-Lee 1994, http://www.w3.org/Talks/WWW94Tim/]
  • 29. PUBLISHED SEMANTICS OF SCHEMAS W3C®
  • 30. RDFS to declare classes of resources, properties, and organize their hierarchy Document creator author Report Document Person
  • 31. OWL in one…  algebraic properties ! union disjunction intersection complement restriction 1..1 disjoint properties 1..1 ! qualified cardinality individual prop. neg   chained prop. cardinality  equivalence enumeration [>18] value restrict. disjoint union  keys …
  • 32. Discovery Hub (Inria, Alcatel Bell Lucent)
  • 33. open your data to those who could use them
  • 34. watchdogs #wearedata
  • 35. many data buried and dormant in web pages
  • 36. schema mapping R2RML a standard transformation of a relationnal database in RDF
  • 37. publication Datalift process demo • one click setup • raw data import • RDF transformation • Web publication • online querying
  • 38. RDFa means RDF in HTML attributs <div xmlns:dc="http://purl.org/dc/elements/1.1/"> <h2 property="dc:title">The trouble with Bob</h2> <h3 property="dc:creator">Alice</h3> ... </div>
  • 39. schema.org = + + + schemas to improve index, search and display e.g: • • • • • • • • Creative works, Book, Movie, MusicRecording, Recipe, TVSeries ... Embedded non-text objects, AudioObject, ImageObject, VideoObject Event Organization Person Place, LocalBusiness, Restaurant ... Product, Offer, AggregateOffer Review, AggregateRating
  • 40. presentation RDFa, microdata,… LDP, HTTP, JSON-LD, … logic data R2RML, SPARQL, RDF, … a (too) fast three-tier summary
  • 41. http://www.w3.org/2001/sw/wiki/Tools
  • 42. towards rich webmarks
  • 43. QAKIS: natural language queries
  • 44. doggy-bag
  • 45. web 1, 2
  • 46. web 1, 2, 3 person price homepage? convert? more info?
  • 47. he who controls metadata, controls the web and through the world-wide web many things in our world. fabien, gandon, @fabien_gandon, http://fabien.info

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