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Reports (Research Report) Year : 2013

Sound, Complete and Minimal UCQ-Rewriting for Existential Rules

Mélanie König
Michel Leclère
Michaël Thomazo


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.
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lirmm-00903375 , version 1 (12-11-2013)


  • HAL Id : lirmm-00903375 , version 1


Mélanie König, Michel Leclère, Marie-Laure Mugnier, Michaël Thomazo. Sound, Complete and Minimal UCQ-Rewriting for Existential Rules. [Research Report] RR-13034, Lirmm. 2013, pp.29. ⟨lirmm-00903375⟩
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