As of today, there exists no standard language for querying Linked Data on the Web, where navigation across distributed data sources is a key feature. A natural candidate seems to be SPARQL, which recently has been enhanced with navigational capabilities thanks to the introduction of property paths (PPs). However, the semantics of SPARQL restricts the scope of navigation via PPs to single RDF graphs. This restriction limits the applicability of PPs on the Web. To fill this gap, in this paper we provide formal foundations for evaluating PPs on the Web, thus contributing to the definition of a query language for Linked Data. In particular, we introduce a query semantics for PPs that couples navigation at the data level with navigation on the Web graph. Given this semantics we find that for some PP-based SPARQL queries a complete evaluation on the Web is not feasible. To enable systems to identify queries that can be evaluated completely, we establish a decidable syntactic property of such queries.

A context-based semantics for SPARQL property paths over the web / Hartig, Olaf; Pirrò, Giuseppe. - 9088:(2015), pp. 71-87. ((Intervento presentato al convegno 12th European Semantic Web Conference, ESWC 2015 tenutosi a Portoroz; Slovenia [10.1007/978-3-319-18818-8_5].

A context-based semantics for SPARQL property paths over the web

Pirrò, Giuseppe
2015

Abstract

As of today, there exists no standard language for querying Linked Data on the Web, where navigation across distributed data sources is a key feature. A natural candidate seems to be SPARQL, which recently has been enhanced with navigational capabilities thanks to the introduction of property paths (PPs). However, the semantics of SPARQL restricts the scope of navigation via PPs to single RDF graphs. This restriction limits the applicability of PPs on the Web. To fill this gap, in this paper we provide formal foundations for evaluating PPs on the Web, thus contributing to the definition of a query language for Linked Data. In particular, we introduce a query semantics for PPs that couples navigation at the data level with navigation on the Web graph. Given this semantics we find that for some PP-based SPARQL queries a complete evaluation on the Web is not feasible. To enable systems to identify queries that can be evaluated completely, we establish a decidable syntactic property of such queries.
12th European Semantic Web Conference, ESWC 2015
semantics; property paths; web queries
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
A context-based semantics for SPARQL property paths over the web / Hartig, Olaf; Pirrò, Giuseppe. - 9088:(2015), pp. 71-87. ((Intervento presentato al convegno 12th European Semantic Web Conference, ESWC 2015 tenutosi a Portoroz; Slovenia [10.1007/978-3-319-18818-8_5].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1274337
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