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Graal: A Toolkit for Query Answering with Existential Rules

2015; Springer Science+Business Media; Linguagem: Inglês

10.1007/978-3-319-21542-6_21

1611-3349

Jean-François Baget, Michel Leclère, Marie-Laure Mugnier, Swan Rocher, Clément Sipieter,

Service-Oriented Architecture and Web Services

This paper presents Graal, a java toolkit dedicated to ontological query answering in the framework of existential rules. We consider knowledge bases composed of data and an ontology expressed by existential rules. The main features of Graal are the following: a basic layer that provides generic interfaces to store and query various kinds of data, forward chaining and query rewriting algorithms, structural analysis of decidability properties of a rule set, a textual format and its parser, and import of OWL 2 files. We describe in more detail the query rewriting algorithms, which rely on original techniques, and report some experiments.