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Re: rdfs:Class vs. daml:Class ?

From: Jeff Z. Pan <pan@cs.man.ac.uk>
Date: Fri, 5 Apr 2002 17:42:23 +0100
Message-ID: <01ef01c1dcc0$eed2d2b0$6bc65882@cs.man.ac.uk>
To: "Pat Hayes" <phayes@ai.uwf.edu>
Cc: "Ian Horrocks" <horrocks@cs.man.ac.uk>, <www-rdf-logic@w3.org>, "Steven Gollery" <sgollery@cadrc.calpoly.edu>
Dear Pat,

Thank you for your email.

> Your message made me take a closer look at this paper,
>and I have to
> say that it seems to be filled with an astonishing number of
> mistakes, assertions made with no supporting evidence, and what are
> essentially aesthetic opinions stated as though they were facts. I
> will list a few here.

Thank you. This paper was published in SWWS in July 2001. It is funny to
think about the fact that it WAS accepted though it had at least 23
"mistakes". We believe these so called "mistakes" at least reveal that you
viewed/interpreted the RDFS syntax in a different way than we did in this

Let's go to the most important point:

> 10. RDFS has an unclear semantics.

This work pre-dates the RDF Model Theory. Since RDF Schema Specification 1.0
gave no formal semantics for RDFS, this work tried to give a model-theoretic
semantics to RDFS. While as some other works [1-3] point out, some elements
of RDFS have dual roles ( examples can be found in this paper and a brief
description of dual roles is also given in the discussion section ), which
means some RDFS element may have more than one interpretations.  This work
solves the problem by mapping RDFS to RDFS(FA), so that no more RDFS
elements have dual roles and then formal semantics can easily be given to

[1] W. Nejdl, M. Wolpers, and C. Capelle. The RDF Schema Specification
In Modelle und Modellierungssprachen in Informatik und
Modellierung 2000, Apr. 2000.

[2] J. Broekstra, M. Klein, S. Decker, D. Fensel, F. van Harmelen, and I.
Enabling knowledge representation on the Web by extending RDF Schema,
Nov. 2000.

[3] Arjohn Kampman and Frank van Harmelen. Sesame's interpretation of
RDF Schema. Aidministrator Netherland Note, URL http://sesame.
aidministrator.nl/doc/rdf-interpretation.html, Apr. 2001.

Best regards,

Jeff Z. Pan  (Home Page: http://www.cs.man.ac.uk/~panz )

Room 2.100                                     email: pan@cs.man.ac.uk
Department of Computer Science      Tel:+44 (0)161 275 6145
University of Manchester                   Fax:+44 (0)161 275 6236
Oxford Road, Manchester
M13 9PL,UK

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Received on Friday, 5 April 2002 11:57:03 UTC

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