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Re: comments on wine.owl

From: Peter F. Patel-Schneider <pfps@research.bell-labs.com>
Date: Fri, 01 Nov 2002 15:52:20 -0500 (EST)
Message-Id: <20021101.155220.44829363.pfps@research.bell-labs.com>
To: michael.smith@eds.com
Cc: www-webont-wg@w3.org

From: "Smith, Michael K" <michael.smith@eds.com>
Subject: RE: comments on wine.owl
Date: Fri, 1 Nov 2002 14:37:33 -0600 

> So, to confirm some XML syntax.
> 
> SubClassOf( TableWine,
>             intersectionOf( Wine, 
> 	                      restriction( hasSugar, hasValue( #Dry ))))
>             
> Becomes:
> 
> <owl:Class rdf:ID="TableWine">
>  <owl:subClassOf>
>   <owl:Class>
>     <owl:intersectionOf rdf:parseType="Collection">
>       <owl:Class rdf:about="#Wine" />
>       <owl:Restriction>
>         <owl:onProperty rdf:resource="#hasSugar" />
>         <owl:hasValue rdf:resource="#Dry" />
>       </owl:Restriction>
>     </owl:intersectionOf>
>   </owl:Class>
>  </owl:subClassOf> 
> </owl:Class>
> 
> Which seem oddly asymmetric with 
> 
> EquivalentClasses( TableWine,
>             intersectionOf( Wine, 
> 	                    restriction( hasSugar, hasValue( #Dry ))))
> 
> <owl:Class rdf:ID="TableWine">
>   <owl:intersectionOf rdf:parseType="Collection">
>     <owl:Class rdf:about="#Wine" />
>     <owl:Restriction>
>       <owl:onProperty rdf:resource="#hasSugar" />
>       <owl:hasValue rdf:resource="#Dry" />
>     </owl:Restriction>
>   </owl:intersectionOf>
> </owl:Class>

Yes, it is asymmetric.  Welcome to the wonderful world of RDF.
If it makes you happier you could consider the second to be an
abbreviation.

> Which could equivalently be written (?)
> 
> <owl:Class rdf:ID="TableWine">
>  <owl:sameClassAs>
>   <owl:Class>
>     <owl:intersectionOf rdf:parseType="Collection">
>       <owl:Class rdf:about="#Wine" />
>       <owl:Restriction>
>         <owl:onProperty rdf:resource="#hasSugar" />
>         <owl:hasValue rdf:resource="#Dry" />
>       </owl:Restriction>
>     </owl:intersectionOf>
>   </owl:Class>
>  </owl:sameClassAs>
> </owl:Class>

Yes.


The first example would more likely be written

 <owl:Class rdf:ID="TableWine">
  <owl:subClassOf rdf:resource="#Wine" />
  <owl:subClassOf>
       <owl:Restriction>
         <owl:onProperty rdf:resource="#hasSugar" />
         <owl:hasValue rdf:resource="#Dry" />
       </owl:Restriction>
  </owl:subClassOf> 
 </owl:Class>


peter
Received on Friday, 1 November 2002 15:52:29 GMT

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