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Linked Data Tutorial

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  • 1. Tutorial Linked Data for Absolute Beginners What is Linked Data good for? Andreas Blumauer Semantic Web Company (SWC) http://www.semantic-web.at/ http://blog.semantic-web.at/ Web 2.0 – What´s next?
  • 2. Databases store data to answer questions (1) Persons Organisations
    • How old is Andreas?
    • Where does Andreas work?
    • What is Andreas interested in?
    • When was SWC founded?
    • Where is SWC located?
    • What can SWC do for me?
  • 3. Databases store data to answer questions (2) Persons Organisations
    • Andreas is .. years old.
    • Andreas works in Vienna.
    • Andreas is interested in the Semantic Web.
    • SWC was founded 4 years ago.
    • SWC is located in Austria.
    • SWC offers IT-Consulting.
    … . … . … . Mike Semantic Web Vienna 08-19 Andreas interests work_place date_birth name … . … . … . Zitgist IT-Consulting Austria 2004 SWC services location date_founded organisation
  • 4. Data from Databases can be exposed to the Web via HTML Persons Organisations
  • 5. Data from Databases can be accessed via APIs getLocation(„SWC“) Persons Organisations getWorkplace(„Andreas“) <workPlace> Vienna </workPlace> <location> Austria </location>
  • 6. (Some) Information on the Web can be found via search engines Google & Co Questions won´t be answered necessarily
  • 7. But how to get answers on complex questions? (1)
    • Who is interested in „Semantic Web“ and is working in the same country as SWC is located?
  • 8. But how to get answers on complex questions? (2)
    • Who is interested in „Semantic Web“ and is working in the same country as SWC is located?
    Persons Organisations same thing? same country? Still no answer … . … . … . Mike Semantic Web Vienna 08-19 Andreas interests work_place date_birth name … . … . … . Zitgist IT-Consulting Austria 2004 SWC services location date_founded organisation Vienna work_place Austria location
  • 9.
    • Any ideas for a solution?
  • 10. Is Mapping the solution? Mapped! same country? What, if DB-owners can´t agree on a common model? Vienna work_place Austria location Still not clear … . … . … . Mike DB engineering TU Vienna 08-19 Andreas course university date_birth name Students And what, if we need to add another database?
  • 11.
    • Mapping is no solution for a distributed Web of data
  • 12.
    • Before I come up with a solution ,
    • let me explain four simple things
  • 13. Resources work_place location place isA isA Austria Vienna partOf type type
  • 14. URIs & Namespaces geo:point geonames:country umbel:place rdfs:subClassOf dbpedia:Austria dbpedia:Vienna p:subdivisionName rdfs:subClassOf rdf:type dbpedia: Vienna http://dbpedia.org/resource/ Vienna = rdf:type rdfs: subClassOf = http://www.w3.org/2000/01/rdf-schema# subClassOf
  • 15. Ontologies work_place location place Person Organisation University worksFor studiesAt isA has isA isA has Austria Vienna partOf type type
  • 16.
    • What, if each resource (classes and individuals) had a URI ?
  • 17. Expose data from databases as resources & triples on the web Persons dbpedia:Vienna persons:Andreas foaf:based_near Organisations dbpedia:Austria orgs:SWC foaf:based_near … . … . … . Mike dbpedia:Semantic Web dbpedia:Vienna 08-19 Andreas foaf:topic_interest foaf:based_near foaf:birthday foaf:name persons:Mike persons:Andreas … . … . … . Zitgist IT-Consulting dbpedia:Austria 2004 SWC orgs:services foaf:based_near foaf:birthday foaf:name orgs:Zitigist orgs:SWC
  • 18. Link data and do queries all over the web dbpedia:Vienna persons:Andreas foaf:based_near dbpedia:Austria orgs:SWC foaf:based_near Who is interested in „Semantic Web“ and is working in the same country as SWC is located? dbpedia:Semantic_Web foaf:topic_interest p:subdivisionName
  • 19. Link data from more than 40 datasets Make use of more than 2 Billion triples! http://esw.w3.org/topic/SweoIG/TaskForces/CommunityProjects/LinkingOpenData
  • 20. How to get answers on really complex questions? dbpedia:Vienna persons:Andreas foaf:based_near dbpedia:Austria orgs:SWC foaf:based_near Who is interested in „Semantic Web“ and is working in a country where the unemployment rate is lower than 5%? dbpedia:Semantic_Web foaf:topic_interest p:subdivisionName eurostat:Österreich owl:sameAs 4.8 eurostat:unemployment_rate_total
  • 21. Use Case: Mobile DBpedia http://wiki.dbpedia.org/DBpediaMobile
  • 22. Use Case: Life Sciences NeuronDB BAMS Literature Homologene SWAN Entrez Gene Gene Ontology Mammalian Phenotype PDSPki BrainPharm AlzGene Antibodies PubChem MESH Reactome Allen Brain Atlas http://www.w3.org/2001/sw/hcls/
  • 23. Conclusio
    • Start your (re)search with
    • Get facts and start to learn on
    • Get deep insights & discover relations with