Constrained regular expressions in SPARQL

Abstract : We have proposed an extension of SPARQL, called PSPARQL, to characterize paths of variable lengths in an RDF knowledge base (e.g. "Does there exists a trip from town A to town B?"). However, PSPARQL queries do not allow expressing constraints on internal nodes (e.g. "Moreover, one of the stops must provide a wireless access."). This paper proposes an extension of PSPARQL, called CPSPARQL, that allows expressing constraints on paths. For this extension, we provide an abstract syntax, semantics as well as a sound and complete inference mechanism for answering CPSPARQL queries.
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Faisal Alkhateeb, Jean-François Baget, Jérôme Euzenat. Constrained regular expressions in SPARQL. International conference on semantic web and web services - SWWS 2008, Aug 2008, Las Vegas, Nevada, United States. pp.91-99. ⟨hal-00793531⟩

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