Conference paper Open Access

SPARQL-LD: A SPARQL Extension for Fetching and Querying Linked Data

Fafalios, Pavlos; Tzitzikas, Yannis


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  <identifier identifierType="DOI">10.5281/zenodo.34621</identifier>
  <creators>
    <creator>
      <creatorName>Fafalios, Pavlos</creatorName>
      <givenName>Pavlos</givenName>
      <familyName>Fafalios</familyName>
      <affiliation>Institute of Computer Science, FORTH-ICS and Computer Science Department, University of Crete, Greece</affiliation>
    </creator>
    <creator>
      <creatorName>Tzitzikas, Yannis</creatorName>
      <givenName>Yannis</givenName>
      <familyName>Tzitzikas</familyName>
      <affiliation>Institute of Computer Science, FORTH-ICS and Computer Science Department, University of Crete, Greece</affiliation>
    </creator>
  </creators>
  <titles>
    <title>SPARQL-LD: A SPARQL Extension for Fetching and Querying Linked Data</title>
  </titles>
  <publisher>Zenodo</publisher>
  <publicationYear>2015</publicationYear>
  <subjects>
    <subject>SPARQL</subject>
    <subject>Linked Data</subject>
    <subject>Web of Data</subject>
  </subjects>
  <dates>
    <date dateType="Issued">2015-12-03</date>
  </dates>
  <resourceType resourceTypeGeneral="ConferencePaper"/>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://zenodo.org/record/34621</alternateIdentifier>
  </alternateIdentifiers>
  <rightsList>
    <rights rightsURI="https://creativecommons.org/licenses/by/4.0/legalcode">Creative Commons Attribution 4.0 International</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">&lt;p&gt;SPARQL is a standard query language for retrieving and manipulating RDF data.&amp;nbsp;However, the majority of SPARQL implementations require the data to be available in advance, i.e., to exist in main memory or in a RDF repository (accessible through a SPARQL endpoint). Nonetheless, Linked Data exists in the Web in various forms; even an HTML Web page can contain RDF data through RDFa, or RDF data may be dynamically created by a Web Service. In this paper, we propose and demonstrate an extension of SPARQL 1.1, called SPARQL-LD, that allows to directly and flexibly exploit this wealth of data. SPARQL-LD allows to fetch, query and integrate in the same SPARQL query: i) data coming from online RDF or JSON-LD files, ii) data coming from dereferenceable URIs, iii) data embedded in Web pages as RDFa, iv) data that is dynamically created by Web Services, and v) data coming by querying other endpoints. A distinctive characteristic of this extension is that it enables to fetch and query even data in datasets returned by a portion of the query, i.e. discovered at query-execution time.&amp;nbsp;&lt;/p&gt;</description>
  </descriptions>
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