|
|
|
|
|
2nd
Workshop on Nottingham, UK |
|
Home
Members Dr.
Taha Osman
DYnamic SErvices Composition(DYSEC) Project Semantic Framework for Image Annotation and Retrieval
1st Workshop on Challenges and Promise of Semantic Web Services 2nd Workshop on Challenges and Promise of Semantic Web
Semantic Web services Research Network,
|
Efficient query answering over ontologies is one of the most useful and important services to support Semantic Web applications. Approximation has been identified as a potential way to reduce the complexity of query answering over OWL DL ontologies. Existing approaches are mainly based on syntactic approximation of ontological axioms and queries. In this talk, I will propose to recast the idea of knowledge compilation into semantically approximating OWL DL ontologies with DL-Lite ontologies, against which query answering has only polynomial data complexity. We identify a useful category of queries for which our approach guarantees also completeness. Furthermore, I will also report on the implementation of our approach in the ONTOSEARCH2 system and preliminary, but encouraging, benchmark results which compare ONTOSEARCH2’s response times on a number of queries with those of existing ontology reasoning systems.
|
