Using rules in the Semantic Web has drawn considerable attention.On the 
one hand, rules help to transformational implementations of the OWL 
semantics; on the other hand, OWL is extended with rules to add more 
expressive power.

SWRL is a W3C proposal to combine rules with OWL ontologies, which can 
be straightforward transformed and appended to Jess rule bases, while 
the predefined Jess rules serve as translating OWL ontologies and making 
hidden knowledge explicit. Alternatively, an engine for SWRL rules in 
RDF graphs provides reasoning over RDF Schema taxonomies plus SWRL 
rules. However, the full implementation of SWRL reasoning is still being 
investigated, and future versions will consider more supports for OWL 
reasoning with less workarounds.