Our seminar series is free and available for anyone to attend. Unless otherwise stated, seminars take place on Wednesday afternoons at 2pm in the Kilburn Building during teaching season.

If you wish to propose a seminar speaker please contact Antoniu Pop.


Theory and practice of ontology-based data access with OWL 2 QL

  • Speaker:   Dr  Michael Zakharyaschev  (Birkbeck, University of London)
  • Host:   IPH
  • 19th February 2014 at 13:00 in L.T1.4 ,KB
Ontology-based data access (OBDA) is widely regarded as a key ingredient for the new generation of information systems. In the OBDA paradigm, an ontology defines a high-level global schema of data sources and provides a vocabulary for user queries. An OBDA system rewrites such queries and ontologies into the vocabulary of the data sources and then delegates the actual query evaluation to a suitable query answering system such as a relational database management system, RDF store or a dialog engine.

This talk will focus on OBDA with the ontology language OWL 2 QL, one of three profiles of the W3C standard Web Ontology Language OWL 2, and relational databases. It will cover the following topics:

-the succinctness problem for conjunctive query rewriting over OWL 2 QL ontologies; -different architectures of OBDA systems; -practical OBDA with Ontop (
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