W3C home > Mailing lists > Public > www-rdf-interest@w3.org > May 2003

Re: rdfs:class and rdfs:resource

From: Richard H. McCullough <rhm@cdepot.net>
Date: Thu, 8 May 2003 13:41:41 -0700
Message-ID: <001901c315a2$5d71a500$bd7ba8c0@rhm8200>
To: <www-rdf-interest@w3.org>, Dieter Köhler <dieter.koehler@philo.de>, "David Menendez" <zednenem@psualum.com>

Thank you , David !!!
I finally understand.

BTW, in my terminology,
two different classes with the same set of resources
belong to two different "contexts" -- 
two different ways of viewing the same resources.
============
Dick McCullough
knowledge := man do identify od existent done;
knowledge haspart proposition list;
----- Original Message ----- 
From: "David Menendez" <zednenem@psualum.com>
To: "Richard H. McCullough" <rhm@cdepot.net>; <www-rdf-interest@w3.org>;
"Dieter Köhler" <dieter.koehler@philo.de>
Sent: Thursday, May 08, 2003 12:13 PM
Subject: Re: rdfs:class and rdfs:resource


> At 4:02 AM -0700 2003-05-08, Richard H. McCullough wrote:
> >The way I see it, every resource is EITHER an individual OR a class.
>
> This is because you do not use the term "class" in the same way as
> RDF. The seeming paradox only arises when you try and make an
> instance of rdfs:Class correspond to your idea of what a "class" is.
>
> Remember: according to the way the terms are used in RDF (and OWL),
> the set of resources belonging to a class is distinct from the class
> itself.
>
> One can draw a parallel to Java here. Java has an Object class, which
> all objects are instances of, and a Class class, which all classes
> are instances of. Class is a subclass of Object, Object is an
> instance of Class, and Class is an instance of Object. However:
> Object is NOT a subclass of Class.
>
> This is exactly the situation in RDFS:
>
> TRUE:
> rdfs:Class rdfs:subClassOf rdfs:Resource .
> rdfs:Resource rdf:type rdfs:Class .
> rdfs:Class rdf:type rdf:Resource .
>
> UNTRUE:
> rdfs:Resource rdfs:subClassOf rdfs:Class .
> -- 
> Dave Menendez - zednenem@psualum.com - http://www.eyrie.org/~zednenem/
Received on Thursday, 8 May 2003 16:42:41 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Monday, 7 December 2009 10:51:59 GMT