Ontology-Based Data Access Using Views

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Abstract

The OWL 2 QL profile, which is based on DL-LiteR, has been designed so that query answering is possible using relational database technology via query rewriting. Unfortunately, given a query Q posed in terms of an OWL 2 QL ontology O, the size of the rewritten query, Q o , which can be evaluated directly on the relational database, is worst case exponential w.r.t the size of Q and O [1]. This means that the computation and evaluation of Q o can be costly. Recent research focuses on creating rewriting algorithms that generates Q o with a smaller size [3].