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RDF Schema Question: adding new domains to a property?

• From: "Roger L. Costello" <costello@m...>
• To: xml-dev@i...
• Date: Tue, 04 May 1999 11:18:30 -0400

As a followup to my last question, where I had the Camera example:

<?xml version="1.0"?> 
<rdf:RDF xmlns:rdf=?http://www.w3.org/1999/02/22-rdf-syntax-ns#?
                 <?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>

Here I show (using the rdfs:domain definitions) f-stop as being usable
by Camera and SLR objects.  Suppose that I create a new Class (not a
subclass of Camera), and I wish to be able to use the f-stop property
with that new Class.  What do I need to do?  Add a new line to the
f-stop property definition?  In general, what advantage is there in
forcing a property to be used specifically with a Class?  When would you
ever want to do this?  It seems like there would not be many, if any,
cases where you would want to restrict where a property could be used. 
/Roger


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