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Erschienen in:
2011 | OriginalPaper | Buchkapitel
Query Rewriting for Inconsistent DL-Lite Ontologies
verfasst von : Domenico Lembo, Maurizio Lenzerini, Riccardo Rosati, Marco Ruzzi, Domenico Fabio Savo
Erschienen in: Web Reasoning and Rule Systems
Verlag: Springer Berlin Heidelberg
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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.