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Re: Why do you want to do that?

From: Richard H. McCullough <rhm@pioneerca.com>
Date: Thu, 14 Aug 2008 11:39:50 -0700
Message-ID: <479C7FED3CC340ED8A8AE47F54036535@rhm8200>
To: "Frank Manola" <fmanola@acm.org>, "Michael Schneider" <schneid@fzi.de>
Cc: "SWIG" <semantic-web@w3.org>

I don't think the RDF - RDFS distinction is important.
I never use RDF without RDFS.

Dick McCullough
Ayn Rand do speak od mKR done;
mKE do enhance od Real Intelligence done;
knowledge := man do identify od existent done;
knowledge haspart proposition list;

----- Original Message ----- 
From: "Frank Manola" <fmanola@acm.org>
To: "Michael Schneider" <schneid@fzi.de>
Cc: "SWIG" <semantic-web@w3.org>; "Richard H. McCullough" 
Sent: Thursday, August 14, 2008 8:15 AM
Subject: Re: Why do you want to do that?

> On Aug 13, 2008, at 7:57 PM, Michael Schneider wrote:
>> Hi Frank!
>> Frank Manola wrote:
>>> There aren't any classes in RDF (per se);  in RDFS there are classes,
>>> and they can be treated as individuals (which is where we came in,
>>> more or less).
>> As a minor remark, I think it's easier to understand the situation of
>> classes in RDFS, if one states the above sentence the other way  around: 
>> In
>> RDFS there are individuals (aka resources), and some of them can be 
>> treated
>> as classes, namely those which happen to have a class extension 
>> associated
>> with them. Analog, some individuals have a property extension  associated
>> with them, and are therefore properties. An individual may even act  as 
>> both,
>> a class *and* a property, if it has both a class extension and a 
>> property
>> extension associated. But in any case (as you say), all classes and
>> properties are individuals, which exist in the RDFS universe, i.e. the
>> domain of discourse.
> Michael--
> You may be right about the sentence "direction".  My main point was 
> simply that, strictly speaking, the "class" concept isn't part of RDF  (it 
> isn't in the "rdf:" vocabulary);  classes are only introduced when  you 
> get to the "rdfs:" vocabulary, as a "semantic extension".
> --Frank
>>> That is, in RDFS a class is a resource (like
>>> everything else that can be referred to in RDFS), and resources can  be
>>> the subjects of triples.
>>> --Frank
>> Cheers,
>> Michael
Received on Thursday, 14 August 2008 18:40:54 UTC

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