Conference paper Open Access

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

Fafalios, Pavlos; Tzitzikas, Yannis


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{
  "description": "<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>", 
  "license": "https://creativecommons.org/licenses/by/4.0/legalcode", 
  "creator": [
    {
      "affiliation": "Institute of Computer Science, FORTH-ICS and Computer Science Department, University of Crete, Greece", 
      "@type": "Person", 
      "name": "Fafalios, Pavlos"
    }, 
    {
      "affiliation": "Institute of Computer Science, FORTH-ICS and Computer Science Department, University of Crete, Greece", 
      "@type": "Person", 
      "name": "Tzitzikas, Yannis"
    }
  ], 
  "headline": "SPARQL-LD: A SPARQL Extension for Fetching and Querying Linked Data", 
  "image": "https://zenodo.org/static/img/logos/zenodo-gradient-round.svg", 
  "datePublished": "2015-12-03", 
  "url": "https://zenodo.org/record/34621", 
  "@type": "ScholarlyArticle", 
  "keywords": [
    "SPARQL", 
    "Linked Data", 
    "Web of Data"
  ], 
  "@context": "https://schema.org/", 
  "identifier": "https://doi.org/10.5281/zenodo.34621", 
  "@id": "https://doi.org/10.5281/zenodo.34621", 
  "workFeatured": {
    "alternateName": "ISWC'15", 
    "location": "Bethlehem, Pennsylvania, USA", 
    "@type": "Event", 
    "name": "14th International Semantic Web Conference - Demonstrations Track"
  }, 
  "name": "SPARQL-LD: A SPARQL Extension for Fetching and Querying Linked Data"
}
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