Query Rewriting for Inconsistent DL-Lite Ontologies


In this paper we study the problem of obtaining meaningful answers to queries posed over inconsistent DL-Lite ontologies. We consider different variants of inconsistency-tolerant semantics and show that for some of such variants answering unions of conjunctive queries (UCQs) is first-order (FOL) rewritable, i.e., it can be reduced to standard evaluation of a FOL/SQL query over a database. Since FOL-rewritability of query answering for UCQs over consistent ontologies under first-order logic semantics is one of the distinguishing features of DL-Lite, in this paper we actually identify some settings in which such property is preserved also under inconsistency-tolerant semantics. We therefore show that in such settings inconsistency-tolerant query answering has the same computational complexity of standard query answering and that it can rely on well-established relational database technology, as under standard DL semantics.

DOI: 10.1007/978-3-642-23580-1_12

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@inproceedings{Lembo2011QueryRF, title={Query Rewriting for Inconsistent DL-Lite Ontologies}, author={Domenico Lembo and Maurizio Lenzerini and Riccardo Rosati and Marco Ruzzi and Domenico Fabio Savo}, booktitle={RR}, year={2011} }