Answers to usual issues in getting started with consuming Linked Data (2010)

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This slideset was part of our "How to consume Linked Data" tutorial at the World Wide Web Conference (WWW), Apr. 2010

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  • Vielen Dank für die kurze Zusammenfassung. Das hat einige meiner Fragen beantwortet.
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Answers to usual issues in getting started with consuming Linked Data (2010)

  1. 1. Getting Started Issues people have when they want to start
  2. 2. Getting Started Finding URIs Finding Additional Data Finding SPARQL Endpoints WWW 2010 Tutorial "How to Consume Linked Data on the Web"
  3. 3. Finding URIs ● Problem: What URIs exist that identify the thing I'm interested in? ● Two options: ● Data source specific solutions ● Search engines for the Web of Linked Data WWW 2010 Tutorial "How to Consume Linked Data on the Web"
  4. 4. Finding URIs ● Some Linked Data sources provide a keyword- based search for things in their dataset(s) ● RKB Explorer http://www.rkbexplorer.com/ ● DBpedia http://lookup.dbpedia.org/ WWW 2010 Tutorial "How to Consume Linked Data on the Web"
  5. 5. WWW 2010 Tutorial "How to Consume Linked Data on the Web"
  6. 6. Finding URIs WWW 2010 Tutorial "How to Consume Linked Data on the Web"
  7. 7. Finding URIs ● What if there is no search possibility? ● You may try a SPARQL query: SELECT DISTINCT ?s WHERE { ?s rdfs:label ?label . FILTER regex( str(?label), "Berlin", "i" ) . } WWW 2010 Tutorial "How to Consume Linked Data on the Web"
  8. 8. Finding URIs ● Search engines for the Web of Linked Data provide keyword-based search for things in different datasets ● Falcons http://iws.seu.edu.cn/services/falcons/ ● Sindice http://sindice.com ● SWSE http://www.swse.org ● Watson http://watson.kmi.open.ac.uk WWW 2010 Tutorial "How to Consume Linked Data on the Web"
  9. 9. Finding URIs WWW 2010 Tutorial "How to Consume Linked Data on the Web"
  10. 10. WWW 2010 Tutorial "How to Consume Linked Data on the Web"
  11. 11. WWW 2010 Tutorial "How to Consume Linked Data on the Web"
  12. 12. Finding URIs ● There are also APIs ● Falcons http://iws.seu.edu.cn/services/falcons/api/index.jsp ● Sindice http://sindice.com/developers/api ● Watson http://watson.kmi.open.ac.uk/REST_API.html WWW 2010 Tutorial "How to Consume Linked Data on the Web"
  13. 13. <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:dc="http://purl.org/dc/elements/1.1/"> <foaf:Document rdf:about="http://iws.seu.edu.cn/services/falcons/api/objectsearch.jsp?query=Berlin"> <dc:description>Provides at most 10 objects hit by the query Berlin.</dc:description> <dc:title>Objects hit by the query Berlin</dc:title> <dc:creator>Falcons API</dc:creator> </foaf:Document> <rdf:Seq> <rdf:li rdf:resource="http://dbpedia.org/resource/Berlin"/> <rdf:li rdf:resource="http://dbpedia.org/resource/Category:Berlin"/> <rdf:li rdf:resource="http://dbpedia.org/resource/Category:People_from_Berlin"/> <rdf:li rdf:resource="http://www.deadjournal.com/interests.bml?int=berlin"/> <rdf:li rdf:resource="http://dbtune.org/jamendo/tag/berlin"/> <rdf:li rdf:resource="http://www4.wiwiss.fu-berlin.de/bookmashup/subject/Berlin"/> <rdf:li rdf:resource="http://www.liveinternet.ru/journal_interest.php?interestid=51320"/> <rdf:li rdf:resource="http://wiki.sembase.at/index.php/_Berlin"/> <rdf:li rdf:resource="http://dbpedia.org/resource/Category:Berlin_U-Bahn_stations"/> <rdf:li rdf:resource="http://dbpedia.org/resource/Category:Berlin_culture"/> </rdf:Seq> </rdf:RDF> WWW 2010 Tutorial "How to Consume Linked Data on the Web"
  14. 14. Getting Started Finding URIs Finding Additional Data Finding SPARQL Endpoints WWW 2010 Tutorial "How to Consume Linked Data on the Web"
  15. 15. Finding Additional Data ● Problem: Given a URI, where do I find more data as what is available by looking it up? ● Three options: ● Follow links (e.g. rdfs:seeAlso, owl:sameAs) ● Use a co-reference service ● Use a search engine for the Web of Linked Data WWW 2010 Tutorial "How to Consume Linked Data on the Web"
  16. 16. Finding Additional Data ● Co-reference services find different URIs that refer to the same thing ● sameAs http://sameas.org WWW 2010 Tutorial "How to Consume Linked Data on the Web"
  17. 17. WWW 2010 Tutorial "How to Consume Linked Data on the Web"
  18. 18. WWW 2010 Tutorial "How to Consume Linked Data on the Web"
  19. 19. Finding Additional Data ● There is also an API ● Specify the preferred format in the URI http://sameas.org/rdf?uri=http://dbpedia.org/resource/Berlin http://sameas.org/n3?uri=http://dbpedia.org/resource/Berlin http://sameas.org/json?uri=http://dbpedia.org/resource/Berlin ● Use content negotiation GET /?uri=http://dbpedia.org/... HTTP/1.1 Host: sameas.org Accept: application/rdf+xml WWW 2010 Tutorial "How to Consume Linked Data on the Web"
  20. 20. Finding Additional Data ● Search engines for the Web of Linked Data provide URI-based search for data from different sources ● Sindice http://sindice.com WWW 2010 Tutorial "How to Consume Linked Data on the Web"
  21. 21. WWW 2010 Tutorial "How to Consume Linked Data on the Web"
  22. 22. WWW 2010 Tutorial "How to Consume Linked Data on the Web"
  23. 23. Getting Started Finding URIs Finding Additional Data Finding SPARQL Endpoints WWW 2010 Tutorial "How to Consume Linked Data on the Web"
  24. 24. Finding SPARQL Endpoints ● Look at: http://esw.w3.org/topic/SparqlEndpoints ● SPARQL 1.1 Service Description ● Vocabulary of Interlinked Datasets (voiD) WWW 2010 Tutorial "How to Consume Linked Data on the Web"

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