An ontology is an explicit specification of shared conceptualization. The Web Ontology Language (OWL) is a family of knowledge representation languages for authoring ontologies, a...
Answering queries over ontologies is an important issue for the Semantic Web. Aggregate queries were widely studied for relational databases but almost no results are known for ag...
Diego Calvanese, Evgeny Kharlamov, Werner Nutt, Ca...
In this paper, we consider the problem of query answering over large multimedia ontologies. Traditional reasoning systems may have problems to deal with large amounts of expressive...
The development of ontologies involves continuous but relatively small modifications. However, existing ontology reasoners do not take advantage of the similarities between differe...
Bernardo Cuenca Grau, Christian Halaschek-Wiener, ...
In order to regulate different circumstances over an extensive period of time, norms in institutions are stated in a vague and biguous manner, thereby abstracting from concrete as...