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Towards closed world reasoning in dynamic open worlds

Published online by Cambridge University Press:  09 July 2010

MARTIN SLOTA  and
JOÃO LEITE
MARTIN SLOTA
Affiliation:
CENTRIA and Departamento de Informática, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
JOÃO LEITE
Affiliation:
CENTRIA and Departamento de Informática, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
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Abstract

The need for integration of ontologies with nonmonotonic rules has been gaining importance in a number of areas, such as the Semantic Web. A number of researchers addressed this problem by proposing a unified semantics for hybrid knowledge bases composed of both an ontology (expressed in a fragment of first-order logic) and nonmonotonic rules. These semantics have matured over the years, but only provide solutions for the static case when knowledge does not need to evolve.

In this paper we take a first step towards addressing the dynamics of hybrid knowledge bases. We focus on knowledge updates and, considering the state of the art of belief update, ontology update and rule update, we show that current solutions are only partial and difficult to combine. Then we extend the existing work on ABox updates with rules, provide a semantics for such evolving hybrid knowledge bases and study its basic properties.

To the best of our knowledge, this is the first time that an update operator is proposed for hybrid knowledge bases.

Keywords

belief changebelief updatehybrid knowledge basesontologiesrulesdescription logicsanswer set programmingsemantic web
Type
Regular Papers
Information
Theory and Practice of Logic Programming , Volume 10 , Special Issue 4-6: 26th International Conference on Logic Programming , July 2010 , pp. 547 - 563
Copyright
Copyright © Cambridge University Press 2010

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