Re: Restriction, DeprecatedClass in OWL Language Reference 31 March 2003

Richard H. McCullough wrote:

> Appendix B declares two Classes (Restriction, Deprecated Class)
> to be subClasses of Class.
> 
> <rdfs:Class rdf:ID="Restriction">
>   <rdfs:label>Restriction</rdfs:label>
>   <rdfs:subClassOf rdf:resource="#Class"/>
> </rdfs:Class>
> <rdfs:Class rdf:ID="DeprecatedClass">
>   <rdfs:label>DeprecatedClass</rdfs:label>
>   <rdfs:subClassOf rdf:resource="&rdfs;Class"/>
> </rdfs:Class>
> 
> I think this is an error.
> If it's not an error, what is the explanation?

Thanks for your comment.

We do not think it is an error. These are built-in metaclasses, the 
instances of which are classes. Thus, owl:Restriction and 
owl:DeprecatedClass are defined as a subclass of the general metaclass 
rdfs:Class (owl:Class is a subclass of rdfs:Class).

Please let us know whether this response is satisfactory.

Guus Schreiber

> ============ 
> Dick McCullough 
> knowledge := man do identify od existent done;
> knowledge haspart proposition list;
> 
> 

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