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Sound, Complete and Minimal UCQ-Rewriting for Existential Rules

Mélanie KönigMélanie König,  Michel LeclèreMichel Leclère,  Marie-Laure MugnierMarie-Laure Mugnier,  Michaël ThomazoMichaël Thomazo

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Mélanie König, Michel Leclère, Marie-Laure Mugnier, Michaël Thomazo
Sound, Complete and Minimal UCQ-Rewriting for Existential Rules
Technical Report, University of Montpellier 2, 2013

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• KurzfassungAbstract
  We address the issue of Ontology-Based Data Access, with ontologies represented in the framework of existential rules, also known as Datalog+/-. A well-known approach involves rewriting the query using ontological knowledge. We focus here on the basic rewriting technique which consists of rewriting the initial query into a union of conjunctive queries. First, we study a generic breadth-first rewriting algorithm, which takes as input any rewriting operator, and define properties of rewriting operators that ensure the correctness of the algorithm. Then, we focus on piece-unifiers, which provide a rewriting operator with the desired properties. Finally, we propose an implementation of this framework and report some experiments.
• Forschungsgruppe:Research Group: Computational LogicComputational Logic

@techreport{KLMT2013,
  author      = {M{\'{e}}lanie K{\"{o}}nig and Michel Lecl{\`{e}}re and
                 Marie-Laure Mugnier and Micha{\"{e}}l Thomazo},
  title       = {Sound, Complete and Minimal {UCQ-Rewriting} for Existential
                 Rules},
  institution = {University of Montpellier 2},
  year        = {2013}
}