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SPARQL SPARQL Protocol And RDF Query Language Robert Engels NFR Verdikt Project n o 2342453 Semantic Technology

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from local to global Information management in the digital age From Locally isolated ... ... to Globally interconnected

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But What CAN you get out of this?

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<ul><li>What is SPARQL? </li></ul><ul><ul><li>Query Language for interlinked graphs represented using RDF/OWL annotations </li></ul></ul><ul><ul><li>SPARQL 1.0: W3C recommendation 2008 </li></ul></ul><ul><ul><li>SPARQL 1.1: nearly a recommendation </li></ul></ul>

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<ul><li>Why SPARQL? </li></ul><ul><ul><li>allows for querying RDF/OWL data & models </li></ul></ul><ul><ul><li>allows to define globally unambiguous queries </li></ul></ul><ul><ul><li>allows for distributed querying of datasets </li></ul></ul><ul><ul><li>query results can be merged automatically </li></ul></ul>

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<ul><li>Differences with SQL? </li></ul><ul><ul><li>querying “graphs” instead of tables </li></ul></ul><ul><ul><li>local keys are replaced with global identifiers </li></ul></ul><ul><ul><li>tables need to provide the same schema, graphs do not </li></ul></ul>

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<ul><li>What can you do with SPARQL? </li></ul><ul><ul><li>various result types </li></ul></ul><ul><ul><ul><li>DESCRIBE, SELECT, ASK & CONSTRUCT </li></ul></ul></ul><ul><ul><li>create result sets using known operators </li></ul></ul><ul><ul><ul><li>a union of two sets (UNION) </li></ul></ul></ul><ul><ul><ul><li>a set representing the reverse of a statement (NOT) </li></ul></ul></ul><ul><ul><ul><li>… . </li></ul></ul></ul><ul><ul><li>algoritmic operators like count, avg , & sum </li></ul></ul><ul><ul><ul><li>specific to SPARQL 1.1 </li></ul></ul></ul>

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SPARQL - “DESCRIBE” Suppose The only thing you have is an Uri like this And no idea what is known about it.... http://data.esis.no/resource/projectID_111667 Simply send a SPARQL “DESCRIBE” to a sparql endpoint DESCRIBE <http://data.esis.no/resource/projectID_111667>

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Result of SPARQL - “DESCRIBE” “ DESCRIBE” This node for me:

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Result of SPARQL - “DESCRIBE” 1 1 1 1 1 2 2

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SPARQL - “SElect” ... or you know what to look for and want to select specific resources. Send a sparql “select” to a sparql endpoint PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX dct: <http://purl.org/dc/terms/> PREFIX nfr: <http://data.esis.no/resource/> PREFIX foaf: <http://xmlns.com/foaf/0.1/> SELECT ?projectID ?projectName WHERE { ?projectID a foaf:Project ; dct:title ?projectName ; nfr:orgnrResponsibleOrg <https://ws.brreg.no/lod/enhet/962392687> . }

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SPARQL - “SELECT”

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RESULT SPARQL - “SELECT”

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SPARQL - “CONSTRUCT” REPLACE NEW PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX dct: <http://purl.org/dc/terms/> PREFIX nfr: <http://data.esis.no/resource/> PREFIX foaf: <http://xmlns.com/foaf/0.1/> PREFIX funder: <http://research.data.gov.uk/def/project/> CONSTRUCT { ?projectID funder:title ?title } WHERE { ?projectID a foaf:Project; dct:title ?title ; nfr:orgnrResponsibleOrg <https://ws.brreg.no/lod/enhet/962392687> . }

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SPARQL - “ASK” TRUE or FALSE? PREFIX nfr: <http://data.esis.no/resource/> ASK { ?projectID nfr:orgnrResponsibleOrg <https://ws.brreg.no/lod/enhet/962392687> }

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Try it yourself! http://data.esis.no:2020/query.html http://opendata.computas.no:7001/joseki/

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Further reading <ul><li>SPARQL 1.0 - W3C recommendation 2008 </li></ul><ul><li>http://www.w3.org/TR/rdf-sparql-query/ </li></ul><ul><li>SPARQL 1.1 – W3C SPARQL working group Wiki </li></ul><ul><li>http://www.w3.org/2009/sparql/wiki/Main_Page </li></ul><ul><li>Extensive tutorials by HP and Talis (and many others...) </li></ul><ul><li>http://openjena.org/ARQ/Tutorial/index.html </li></ul><ul><li>http://www.slideshare.net/ldodds/sparql-tutorial </li></ul>

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www.sesam4.net