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Re: "sameAs" error in OWL Language Reference 31 March 2003

From: <rhm@cdepot.net>
Date: Fri, 20 Jun 2003 17:39:01 -0000
Message-Id: <200306201739.h5KHd1vH005462@web178.megawebservers.com>
To: "Jim Hendler" <hendler@cs.umd.edu>, "Richard H. McCullough" <rhm@cdepot.net>, "Guus Schreiber" <schreiber@cs.vu.nl>
Cc: <public-webont-comments@w3.org>



I understand.
Consider the item closed.
Dick McCullough

Jim Hendler <hendler@cs.umd.edu> said:

> At 2:03 AM -0700 5/8/03, Richard H. McCullough wrote:
> >I consider that response to be unsatisfactory.
> >"Identity" is the most basic concept in logic.
> >OWL should be able to express "identity" directly,
> >instead of having to prove it.
> 
> 
> Richard - I am a bit confused about this comment.  I agree with what 
> you say above, but you are bringing up this problem in the context of 
> as RDFS description of owl -- and RDFS has no way to directly express 
> identity (other than using the same URI) instead one must create 
> something like what we have done below -- making two things 
> subproperties of each other.  In OWL we would be able to do what you 
> want, but the appendix you are asking about was designed to be an 
> RDFS document.  That is, Owl certainly has the ability to express 
> identity directly.  For example, I can say
> 
> :JohnKennedy a person.
> :JackKennedy a person.
> :JohnKennedy owl:sameAs :JackKennedy.
> 
> So I see that we can do exactly what you ask, we just can't put it 
> into the appendix you're asking it to go in, because that appendix is 
> written in the less expressive RDFS
>   - Jim Hendler
> 
> 
> 
> 
> 
> >============
> >Dick McCullough
> >knowledge := man do identify od existent done;
> >knowledge haspart proposition list;
> >----- Original Message -----
> >From: "Guus Schreiber" <schreiber@cs.vu.nl>
> >To: "Richard H. McCullough" <rhm@cdepot.net>
> >Cc: <public-webont-comments@w3.org>
> >Sent: Thursday, May 08, 2003 1:52 AM
> >Subject: Re: "sameAs" error in OWL Language Reference 31 March 2003
> >
> >
> >>  Richard H. McCullough wrote:
> >>
> >>   > Section 5.2 says sameAs is a synonym for sameIndividualAs
> >>   >
> >>   > Appendix B says sameAs is a subProperty of sameIndividualAs
> >>
> >>  Thanks for your comment and for reviewing our documents.
> >>  Appendix B indeed defines sameAs as a subproperty of sameIndividualAs,
> >>  but also the inverse: sameIndividualAs is defined as a subproperty of
> >>  sameAs:
> >>
> >>  [[
> >>  <rdf:Property rdf:ID="sameIndividualAs">
> >>     <rdfs:label>sameIndividualAs</rdfs:label>
> >>     <rdfs:domain rdf:resource="#Thing"/>
> >>     <rdfs:range rdf:resource="#Thing"/>
> >>     <rdfs:subPropertyOf rdf:resource="#sameAs"/>
> >>  </rdf:Property>
> >>
> >>  <rdf:Property rdf:ID="sameAs">
> >>     <rdfs:label>sameAs</rdfs:label>
> >>     <rdfs:subPropertyOf rdf:resource="#sameIndividualAs"/>
> >>  </rdf:Property>
> >>  ]]
> >>
> >>  The combination of these two subproperty statements implies that the
> >>  extensions of sameAs and sameIndividualAs are identical.
> >>
> >>  Please let us know whether this response is satisfactory.
> >>
> >>  Thanks again for your comment,
> >>  Guus Schreiber
> >>
> >>   >
> >>   > ============
> >>   > Dick McCullough <mailto:rhm@cdepot.net>
> >>   > knowledge <http://rhm.cdepot.net/> *:=* man *do* identify *od*
> >>  existent *done;*
> >>   > knowledge <http://www.volcano.net/~rhm/knowledge> *haspart*
> >>  proposition list;
> >>
> >>
> >>  --
> >>  NOTE: new affiliation per April 1, 2003
> >>
> >>  Free University Amsterdam, Computer Science
> >>  De Boelelaan 1081a, 1081 HV Amsterdam, The Netherlands
> >>  Tel: +31 20 444 7739/7718
> >>  E-mail: schreiber@cs.vu.nl
> >>  Home page: http://www.cs.vu.nl/~guus/ [under construction]
> >>
> >>
> 
> -- 
> 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	  *** 240-277-3388 (Cell)
> http://www.cs.umd.edu/users/hendler      *** NOTE CHANGED CELL NUMBER ***
> 



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Received on Friday, 20 June 2003 13:39:19 GMT

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