Module extraction is the task of computing a (preferably small) fragment M of an ontology O
that preserves a class of entailments over a signature of interest Σ. Extracting modules of …

Answering conjunctive queries over ontology-enriched datasets is a core reasoning task for
many applications. Query answering is, however, computationally very expensive, which …

We present an enhanced hybrid approach to OWL query answering that combines an RDF
triple-store with an OWL reasoner in order to provide scalable pay-as-you-go performance …

Faceted search is the de facto query paradigm in e-commerce and it has been recently
adapted for the Semantic Web. In this demonstration we present our faceted search system …

Query answering over OWL 2 DL ontologies is an important reasoning task for many modern
applications. Unfortunately, due to its high computational complexity, OWL 2 DL systems are …

Ontologies are increasingly used to provide structure and enhance access to large datasets.
In such applications the ontology can be seen as a TBox, and the dataset as an ABox, with …

Abstract The Semantic Web represents an evolution of the World Wide Web towards one of
entities and their relationships, rather than pages and links. Such a progression makes it …

The size and growth rate of the Semantic Web call for querying and reasoning methods that
can be applied over very large amounts of data. In this paper, we discuss how we can enrich …

In previous work it has been shown how an OWL 2 DL ontology O can be 'repaired'for an
OWL 2 RL system ans—that is, how we can compute a set of axioms R that is independent …

This system description paper introduces the OWL 2 query answering system Hydrowl.
Hydrowl is based on novel hybrid techniques which in order to compute the query answers …