Document Type

Conference Proceeding

Publication Date



Description Logics – the logics underpinning the Web Ontology Language OWL – and rules are currently the most prominent paradigms used for modeling knowledge for the Semantic Web. While both of these approaches are based on classical logic, the paradigms also differ significantly, so that naive combinations result in undesirable properties such as undecidability. Recent work has shown that many rules can in fact be expressed in OWL. In this paper we extend this work to include some types of rules previously excluded. We formally define a set of first order logic rules, C-Rules, which can be expressed within OWL extended with role conjunction. We also show that the use of nominal schemas results in even broader coverage.


Attached is the unpublished, peer-reviewed version of the proceeding. The final, publisher's version of this proceeding can be found at

Presented at the 9th Extended Semantic Web Conference (ESWC), Haraklion, Greece, May 27-31, 2012.