Re: OWL CR feedback: owl:Class 'vs' rdfs:Class causing pain. Is owl:Class really needed?

Pat, this is perhaps a useful perspective on
the matter, but what's at issue in this
public-webont-comments forum is whether the
question is answered by the OWL specs.

Please try to answer the question from
the text of the specs. If you guys just
want to discuss this stuff free-form, please
use www-rdf-logic or whatever.

On Wed, 2003-09-17 at 21:35, pat hayes wrote:
> [...]
> >Are all RDF classes OWL classes?
> 
> No. RDFS has a more general notion of class than OWL has. In 
> particular, rdfs:Class is not an OWL class.
> 
> >and vice-versa?
> 
> Yes.
> 
> >Can this be expressed
> >with (rdfs):subClassOf?
> 
> Yes, in RDFS:
> 
> owl:Class rdfs:subClassOf rdfs:Class.
> 
> However, this fact is 'invisible' in OWL because of the restrictions 
> which have been placed on the expressivity of OWL syntax

[...]


-- 
Dan Connolly, W3C http://www.w3.org/People/Connolly/