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   RDF Question: just need to reference the parent class for domain?

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  • From: "Roger L. Costello" <costello@mitre.org>
  • To: xml-dev@ic.ac.uk
  • 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#”
      <rdfs:Class rdf:ID=“Camera”>
      <rdfs:Class rdf:ID=“SLR”>
            <rdfs:subClassOf rdf:resource=“#Camera”/>
      <rdf:Property ID=“f-stop”>
            <rdfs:domain rdf:resource=“#Camera”/>
            <rdfs:domain rdf:resource=“#SLR”/>
            <rdfs:range rdf:resource=“...#Real”/>

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”/>

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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