Re: [ontolog-forum] [LC response] To Richard H. McCullough

["Richard H. McCullough" <rhm@xxxxxxxxxxxxx>]

No, I am not satisfied with your proposed additional text.

 

If  OWL2 "class" is the "extension set" of a "concept",

your document should say that.

 

If your document does not say that, you are missing

this unique opportunity to eliminate the confusion

associated with RDF "class".

 

I propose adding the text below as the first paragraph

of section 4 of the OWL2 primer.

 

Natural languages use a "concept" to refer to a group

of similar, individual entities.  A "concept" may be

defined by its

    "extension" -- the set of all individual entities

                        which are members of the group

    "genus" -- the more general group which includes

                   all individual members of the group

    "differentiae" -- the properties [a.k.a. "intension"]

                          which are shared by all individual

                          members of the group, and which

                          distinguish them from other members

                          of the "genus".

In OWL 2:

    a "class" is the "extension set" of a "concept";

    the "class" is a "subClassOf" the "genus class";

    property "restrictions" specify the "differentiae".

 

Dick McCullough
http://mkrmke.org

 

----- Original Message -----

From: "Sebastian Rudolph" <rudolph@xxxxxxxxxxxxxxxxxxxxx>

To: <rhm@xxxxxxxxxxxxx>

Cc: <public-owl-comments@xxxxxx>

Sent: Wednesday, May 13, 2009 10:41 AM

Subject: [LC response] To Richard H. McCullough

> Dear Richard,
> 
> Thank you for your 
comment
>      <http://lists.w3.org/Archives/Public/public-owl-comments/2009Apr/0066.html 
> >
> on the OWL 2 Web Ontology Language 
last call drafts.
> 
> In order to avoid any possible confusion we 
have added some text to  
> the OWL 2 Primer that clarifies the 
meaning of class and the  
> correspondence with concept (see 
<http://www.w3.org/2007/OWL/wiki/index.php?title=Primer&diff=23518&oldid=23517 
> >).
> 
> As a historical remark, 
the use of "class" in OWL 2 comes from its  
> prior use in related 
representation systems. RDF uses "class" (as  
> opposed to "concept" 
or another term). The original version of OWL  
> uses "class" to be 
compatible with RDF.
> 
> Please acknowledge receipt of this email 
to <mailto:public-owl-comments@xxxxxx 
> > (replying to this email should suffice). In your 
acknowledgment  
> please let us know whether or not you are 
satisfied with the working  
> group's response to your 
comment.
> 
> Regards,
> Sebastian Rudolph
> on behalf 
of the W3C OWL Working Group
> 
> 
> 
_________________________________________________
> Dr. Sebastian 
Rudolph
> Institute AIFB, University of Karlsruhe, D-76128 
Karlsruhe
> rudolph@xxxxxxxxxxxxxxxxxxxxx    phone +49 (0)721 608 7362
> www.sebastian-rudolph.de                 
fax +49 (0)721 608 5998
> 
> 
> 
> 
>
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