Conference paper Open Access

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

Fafalios, Pavlos; Tzitzikas, Yannis


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    <subfield code="a">&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;</subfield>
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    <subfield code="u">Institute of Computer Science, FORTH-ICS and Computer Science Department, University of Crete, Greece</subfield>
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