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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#”
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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