RDF rule dialects (such as the now recommended RIF dialects) seem to allow variables for predicate symbols. This seems counter-intuitive since datalog and horn clause languages in …

What are the limitations of OWL 2, i.e. in which cases do we require a rule language such as SWRL? If SWRL was developed to address the shortcomings of OWL 1 (e.g. no property chai …

Hi! For some time now I have been experimenting with Semantic Web technologies such as RDF, RDF Schema and a little bit of OWL, and I feel ready to look closer at mechanisms for ru …

A slight rephrasing of the question posed at ISWC (which was does the linked data web need ontologies - but the definition of ontology was kept sufficiently vague as to make the qu …