SPARQL 1.1 supports the use of ontologies to enrich query results with logical entailments, and OWL 2 provides a dedicated fragment OWL QL for this purpose. Typical implementations use the OWL QL schema to rewrite a conjunctive query into an equivalent set of queries, to be answered against
the non-schema part of the data. With the adoption of the recent SPARQL 1.1
standard, however, RDF databases are capable of answering much more expressive queries directly, and this paper asks how this can be exploited in query rewriting.

Keywords: Ontology-Based Data Access (OBDA), Entailment Regimes, Web Ontology Labnuage (OWL), Ontology, SPARQL
Author: Bischof, Stefan
Publisher: Krötzsch, Markus
Time required: P60M
Educational use: instruction
Educational audience: student
Interactivity type: expositive

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