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- From: "Roger L. Costello" <costello@mitre.org>
- To: xml-dev@ic.ac.uk
- 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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