On the Exploration of the Query Rewriting Space with Existential Rules - LIRMM - Laboratoire d’Informatique, de Robotique et de Microélectronique de Montpellier Access content directly
Conference Papers Year : 2013

On the Exploration of the Query Rewriting Space with Existential Rules

Mélanie König
Michel Leclère
Michaël Thomazo

Abstract

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 a conjunctive query (CQ) into a union of CQs. We assume that the set of rules is a finite unification set, i.e., for any CQ, there exists a finite sound and complete rewriting of this CQ with the rules. First, we study a generic breadth-first rewriting algorithm, which takes as input any rewriting operator. We define properties of the rewriting operator that ensure the correctness and the termination of this algorithm. Second, we study some operators with respect to the exhibited properties. All these operators have in common to be based on so-called piece-unifiers but they lead to different explorations of the rewriting space. Finally, an experimental comparison of these operators within an implementation of the generic breadth-first rewriting algorithm is presented.
Fichier principal
Vignette du fichier
main2.pdf (175.55 Ko) Télécharger le fichier
Origin Files produced by the author(s)
Loading...

Dates and versions

lirmm-00838806 , version 1 (07-11-2013)

Identifiers

Cite

Mélanie König, Michel Leclère, Marie-Laure Mugnier, Michaël Thomazo. On the Exploration of the Query Rewriting Space with Existential Rules. RR: Web Reasoning and Rule Systems, Aug 2013, Mannheim, Germany. pp.123-137, ⟨10.1007/978-3-642-39666-3_10⟩. ⟨lirmm-00838806⟩
410 View
405 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More