Mariano Rodriguez-Muro, Josef Hardi and Diego Calvanese, Quest: Efficient SPARQL-to-SQL for RDF and OWL, in Proceedings of the ISWC 2012 Posters & Demonstrations Track, Boston, US, November, 2012. [PDF(local)], [PDF(online)]

Abstract:
In this demo we introduce Quest, a new system that provides SPARQL query answering with support for OWL~2~QL and RDFS entailments. Quest allows to link the vocabulary of an ontology to the content of a relational database through mapping axioms. These are then used together with the ontology to answer a SPARQL query by means of a single SQL query that is executed over the database. Quest uses highly-optimised query rewriting techniques to generate the SQL query which not only takes into account the entailments of the ontology and data, but is also 'lean' and simple so that it can be executed efficiently by any SQL engine. Quest supports commercial and open source databases, including database federation tools like Teiid to allow for Ontology Based Data Integration of relational and other sources (e.g., CSV, Excel, XML). Here we will briefly describe Quest mapping language, the query answering process and the most relevant optimisation techniques used by the system. We will conclude with a brief description of the content of this demo.

BibTex:

    @InProceedings { iswc2012paper-poster-demo-59,
      author = { Mariano Rodriguez-Muro, Josef Hardi and Diego Calvanese },
      title = { Quest: Efficient SPARQL-to-SQL for RDF and OWL },
      booktitle = { Proceedings of the ISWC 2012 Posters & Demonstrations Track },
      address = {Boston, US},
      month = { November },
      year = { 2012 },
    }

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