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01/31/2019
Query Inseparability for ALC Ontologies
We investigate the problem whether two ALC ontologies are indistinguisha...
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06/15/2018
Efficient Handling of SPARQL OPTIONAL for OBDA (Extended Version)
OPTIONAL is a key feature in SPARQL for dealing with missing information...
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04/20/2018
Inseparability and Conservative Extensions of Description Logic Ontologies: A Survey
The question whether an ontology can safely be replaced by another, poss...
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11/26/2015
Beyond OWL 2 QL in OBDA: Rewritings and Approximations (Extended Version)
Ontology-based data access (OBDA) is a novel paradigm facilitating acces...
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04/21/2013