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DaRLing: A Datalog rewriter for OWL 2 RL ontological reasoning under SPARQL queries

Published online by Cambridge University Press:  22 September 2020

ALESSIO FIORENTINO Open the ORCID record for ALESSIO FIORENTINO [Opens in a new window] ,
JESSICA ZANGARI Open the ORCID record for JESSICA ZANGARI [Opens in a new window]  and
MARCO MANNA Open the ORCID record for MARCO MANNA [Opens in a new window]
ALESSIO FIORENTINO
Affiliation:
Department of Mathematics and Computer Science (DeMaCS), University of Calabria, Rende, Italy (e-mail: lastname@mat.unical.it) - https://www.mat.unical.it
JESSICA ZANGARI
Affiliation:
Department of Mathematics and Computer Science (DeMaCS), University of Calabria, Rende, Italy (e-mail: lastname@mat.unical.it) - https://www.mat.unical.it
MARCO MANNA
Affiliation:
Department of Mathematics and Computer Science (DeMaCS), University of Calabria, Rende, Italy (e-mail: lastname@mat.unical.it) - https://www.mat.unical.it
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Abstract

The W3C Web Ontology Language (OWL) is a powerful knowledge representation formalism at the basis of many semantic-centric applications. Since its unrestricted usage makes reasoning undecidable already in case of very simple tasks, expressive yet decidable fragments have been identified. Among them, we focus on OWL 2 RL, which offers a rich variety of semantic constructors, apart from supporting all RDFS datatypes. Although popular Web resources - such as DBpedia - fall in OWL 2 RL, only a few systems have been designed and implemented for this fragment. None of them, however, fully satisfy all the following desiderata: (i) being freely available and regularly maintained; (ii) supporting query answering and SPARQL queries; (iii) properly applying the sameAs property without adopting the unique name assumption; (iv) dealing with concrete datatypes. To fill the gap, we present DaRLing, a freely available Datalog rewriter for OWL 2 RL ontological reasoning under SPARQL queries. In particular, we describe its architecture, the rewriting strategies it implements, and the result of an experimental evaluation that demonstrates its practical applicability.

Keywords

DatalogOWL 2 RLSPARQLQuery Answering
Type
Original Article
Information
Theory and Practice of Logic Programming , Volume 20 , Issue 6: 36th International Conference on Logic Programming Special Issue II , November 2020 , pp. 958 - 973
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Copyright
© The Author(s), 2020. Published by Cambridge University Press

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Footnotes

*

This work has been partially supported by MISE under the project “S2BDW” (F/050389/01-03/X32) – Horizon 2020 PON I&C 2014-2020 and by Regione Calabria under the project “DLV LargeScale” (CUP J28C17000220006) – POR Calabria 2014-2020.

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