- From: Richard H. McCullough <rhm@cdepot.net>
- Date: Thu, 21 Nov 2002 18:41:12 -0800
- To: <m.spork@qut.edu.au>, <www-rdf-interest@w3.org>
- Message-ID: <001401c291d0$9fab1650$bd7ba8c0@rhm8200>
That seems backwards. Shouldn't you assert the existence of members, even if you can't specify all their properties? The existence of the class logically depends on the existence of its members. Is there a mechanism for guaranteeing that members are found? I suppose that's been taken into account. If so, sounds like a reasonable, iterative, engineering solution. I am an engineer, so I appreciate such things. Thanks for bringing this to my attention. ============ Dick McCullough knowledge := man do identify od existent done knowledge haspart list of proposition ----- Original Message ----- From: Murray Spork To: Richard H. McCullough ; www-rdf-interest@w3.org Sent: Thursday, November 21, 2002 5:33 PM Subject: Re: RDF vocabulary definitions Richard H. McCullough wrote: > This is where I draw the line in the sand. > I am definitely saying that the concept of RDF Class is wrong. > I'll try to answer each of your questions. If I haven't answered some > to your satisfaction, speak up. > > 1. a number is a class. > "two" is the abstraction of "two apples", "two oranges", "two people", etc. > > 2. an empty class is nonexistent. > if the class has no members, it is a "floating abstraction", a > "contradiction" > it does not exist > it has no properties > how many ways can I say it? I think one of the main motivations with description logics is that you can partially describe things (configuration management systems make great use of this). Having an RDF graph that asserts the existence of some class - but that does not assert the existence of any members of that class - does not mean that no members exist. It just means we don't know about those members yet. Cheers -- Murray Spork Centre for Information Technology Innovation (CITI) The Redcone Project Queensland University of Technology, Brisbane, Australia Phone: +61-7-3864-9488 Email: m.spork@qut.edu.au Web: http://redcone.gbst.com/
Received on Thursday, 21 November 2002 21:41:14 UTC