- From: Jan Grant <Jan.Grant@bristol.ac.uk>
- Date: Mon, 26 Feb 2001 10:53:41 +0000 (GMT)
- To: Frank van Harmelen <Frank.van.Harmelen@cs.vu.nl>
- cc: www-rdf-logic <www-rdf-logic@w3.org>
On Sat, 24 Feb 2001, Frank van Harmelen wrote: > [1] > "Warning: The RDF Schema specification demands that the subclass-relation between classes > must be acyclic. We believe this to be too restrictive, since a cycle of subclass > relationships provides a useful way to assert equality between classes. Consequently, > DAML+OIL places no such restriction on the subClassOf relationship between classes;" > > [2] > "[in DAML+OIL] multiple domain expressions restrict the domain of P to the intersection of > the class expressions. > Warning: This is contrary to the semantics of the domain element in the RDF Schema > specification, which we believe to be flawed." > > [3] > "Warning: Although the RDF Schema specification only allows one range restriction for each > property, it seems quite natural to allow multiple range restrictions. These would then > again be interpreted as saying that the range of P must be the intersection of all the > class expressions." These choices seem to be the right ones anyway. -- jan grant, ILRT, University of Bristol. http://www.ilrt.bris.ac.uk/ Tel +44(0)117 9287163 Fax +44 (0)117 9287112 RFC822 jan.grant@bris.ac.uk Axioms speak louder than words.
Received on Monday, 26 February 2001 05:55:27 UTC