Conference paper Open Access

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

Fafalios, Pavlos; Tzitzikas, Yannis


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{
  "publisher": "Zenodo", 
  "DOI": "10.5281/zenodo.34621", 
  "title": "SPARQL-LD: A SPARQL Extension for Fetching and Querying Linked Data", 
  "issued": {
    "date-parts": [
      [
        2015, 
        12, 
        3
      ]
    ]
  }, 
  "abstract": "<p>SPARQL is a standard query language for retrieving and manipulating RDF data.&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.&nbsp;</p>", 
  "author": [
    {
      "given": "Pavlos", 
      "family": "Fafalios"
    }, 
    {
      "given": "Yannis", 
      "family": "Tzitzikas"
    }
  ], 
  "id": "34621", 
  "event-place": "Bethlehem, Pennsylvania, USA", 
  "type": "paper-conference", 
  "event": "14th International Semantic Web Conference - Demonstrations Track (ISWC'15)"
}
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