• From: "Roger L. Costello" <costello@m...>
• To: xml-dev@i...
• Date: Tue, 04 May 1999 07:49:36 -0400

Consider this RDF Schema definition:

<?xml version="1.0"?> 
<rdf:RDF xmlns:rdf=?http://www.w3.org/1999/02/22-rdf-syntax-ns#?
                 xmlns:rdfs=?.../PR-rdf-schema-19990303#?>
      <rdfs:Class rdf:ID=?Camera?>
            <rdfs:subClassOf 
                      rdf:resource=?...#Resource?/>
      </rdfs:Class>
      <rdfs:Class rdf:ID=?SLR?>
            <rdfs:subClassOf rdf:resource=?#Camera?/>
      </rdf:Class>
      <rdf:Property ID=?f-stop?>
            <rdfs:domain rdf:resource=?#Camera?/>
            <rdfs:domain rdf:resource=?#SLR?/>
            <rdfs:range rdf:resource=?...#Real?/>
      </rdf:Property>
</rdf:RDF>

Note that SLR is a subClass of Camera.  In the definition of the f-stop
property I indicate what domains the property may be used in - Camera
and SLR.  My question is this: since SLR is a subclass of Camera then
can I omit the second domain property, i.e., just use:

      <rdf:Property ID=?f-stop?>
            <rdfs:domain rdf:resource=?#Camera?/>
            <rdfs:range rdf:resource=?...#Real?/>
      </rdf:Property>

f-stop can be used in any sublasses of Camera and I don't have to
specify all the subclasses that it may be used in.  Correct?  /Roger


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