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Answers to usual issues in getting started with consuming Linked Data
 

Answers to usual issues in getting started with consuming Linked Data

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This slideset was part of our "How to consume Linked Data" tutorial at the International Semantic Web Conference (ISWC), Oct. 2009

This slideset was part of our "How to consume Linked Data" tutorial at the International Semantic Web Conference (ISWC), Oct. 2009

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Answers to usual issues in getting started with consuming Linked Data Answers to usual issues in getting started with consuming Linked Data Presentation Transcript

  • Getting Started Issues people have when they want to start ISWC 2009 Tutorial "How to Consume Linked Data on the Web"
  • Getting Started Finding URIs Finding Additional Data Finding SPARQL Endpoints ISWC 2009 Tutorial "How to Consume Linked Data on the Web"
  • 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 ISWC 2009 Tutorial "How to Consume Linked Data on the Web"
  • 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/ ISWC 2009 Tutorial "How to Consume Linked Data on the Web"
  • ISWC 2009 Tutorial "How to Consume Linked Data on the Web"
  • Finding URIs ISWC 2009 Tutorial "How to Consume Linked Data on the Web"
  • 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" ) . } ISWC 2009 Tutorial "How to Consume Linked Data on the Web"
  • 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 ISWC 2009 Tutorial "How to Consume Linked Data on the Web"
  • Finding URIs ISWC 2009 Tutorial "How to Consume Linked Data on the Web"
  • ISWC 2009 Tutorial "How to Consume Linked Data on the Web"
  • ISWC 2009 Tutorial "How to Consume Linked Data on the Web"
  • 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 ISWC 2009 Tutorial "How to Consume Linked Data on the Web"
  • <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> ISWC 2009 Tutorial "How to Consume Linked Data on the Web"
  • Getting Started Finding URIs Finding Additional Data Finding SPARQL Endpoints ISWC 2009 Tutorial "How to Consume Linked Data on the Web"
  • 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 ISWC 2009 Tutorial "How to Consume Linked Data on the Web"
  • Finding Additional Data ● Co-reference services find different URIs that refer to the same thing ● sameAs http://sameas.org ISWC 2009 Tutorial "How to Consume Linked Data on the Web"
  • ISWC 2009 Tutorial "How to Consume Linked Data on the Web"
  • ISWC 2009 Tutorial "How to Consume Linked Data on the Web"
  • 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 ISWC 2009 Tutorial "How to Consume Linked Data on the Web"
  • Finding Additional Data ● Search engines for the Web of Linked Data provide URI-based search for data from different sources ● Sindice http://sindice.com ISWC 2009 Tutorial "How to Consume Linked Data on the Web"
  • ISWC 2009 Tutorial "How to Consume Linked Data on the Web"
  • ISWC 2009 Tutorial "How to Consume Linked Data on the Web"
  • Getting Started Finding URIs Finding Additional Data Finding SPARQL Endpoints ISWC 2009 Tutorial "How to Consume Linked Data on the Web"
  • Finding SPARQL Endpoints ● Look at: http://esw.w3.org/topic/SparqlEndpoints ● SPARQL 1.1 Service Description ● Vocabulary of Interlinked Datasets (voiD) ISWC 2009 Tutorial "How to Consume Linked Data on the Web"