Chapter

Web Reasoning and Rule Systems

Volume 7497 of the series Lecture Notes in Computer Science pp 262-265

Ontology-Based Data Access Using Views

  • Juan F. Sequeda
  • , Marcelo ArenasAffiliated withLancaster UniversityDepartment of Computer Science, PUC
  • , Daniel P. Miranker

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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].