W3C home > Mailing lists > Public > www-webont-wg@w3.org > November 2002

Re: SEM: Light review of semantics document

From: Jim Hendler <hendler@cs.umd.edu>
Date: Sun, 10 Nov 2002 21:18:01 -0500
Message-Id: <p05111708b9f4c36a9b2f@[]>
To: "Jonathan Borden" <jonathan@openhealth.org>
Cc: <www-webont-wg@w3.org>

At 8:48 PM -0500 11/10/02, Jonathan Borden wrote:
>Jim Hendler wrote:
>>  >  >
>>  >>  Namespace definitions to RDF and to Chris' document
>>  >>
>>  >>  <rdf:RDF>
>>  >>     <chris:person rdf:id="Hendler" />
>>  >>  </rdf:RDF>
>>  >
>>  >Well what if *I* say something like:
>>  >
>>  >chris:person owl:subClassOf owl:Class .
>>  >
>>  >elsewhere, and suppose I believe this :-), now your supposedly perfect
>>  >document *does* use OWL terms...
>>  I don't understand - you cannot write that in my document - so you
>>  can only discover that chris:person uses owl terms by going and
>>  looking in the chris: document.  MY document will never be
>>  distinguishable technically from any other RDF document - I just want
>>  a piece of terminology to refer to it as something so I can say "when
>>  you have a document that is an RDF document but some of the documents
>>  it links to are OWL documents ..." in a lot less words - i.e. "When
>>  you have an Owl Data Document ... "
>Yes but I am saying that your document is actually an OWL _Ontology_
>document -- it defines a class!

It does?  What class is it defining?

>  >   I don't understand why this seem to be controversial - seems obvious
>>  to me we will need to refer to these documents a lot (i.e. my web
>>  page is linked to one of them, and I hope lots of other people's will
>>  be soon)
>It should not be controversial that the nature of RDF blurs the distinction
>between ontology and data just as LISP blurred the distinction between
>program and data. This is the essence of the classes as intances feature.
>Perhaps we ought to just say that no crisp distinction exists, and explain
>this in plain English.

Professor James Hendler				  hendler@cs.umd.edu
Director, Semantic Web and Agent Technologies	  301-405-2696
Maryland Information and Network Dynamics Lab.	  301-405-6707 (Fax)
Univ of Maryland, College Park, MD 20742	  240-731-3822 (Cell)
Received on Sunday, 10 November 2002 21:18:11 UTC

This archive was generated by hypermail 2.4.0 : Friday, 17 January 2020 23:04:38 UTC