Hi all,
the resource shape spec states that a Shape resource has zero-or-more
oslc:Property's
an oslc:Property has a (Resource, exactly-one) "rdf:type".
This is a category error in the RDF model. The rdf:type is the type of
the instance, not the type of the RDF predicate which is modelling the
oslc:Property.
To be concrete - here is an example from the draft:
<oslc:property>
<oslc:Property>
<oslc:name>modified</oslc:name>
<oslc:occurs>exactly-one</oslc:occurs>
<oslc:namespace rdf:resource="http://purl.org/dc/terms#"; />
<rdf:type rdf:resource="http://purl.org/dc/terms#modified"; />
<oslc:valueType rdf:resource="
http://www.w3.org/2001/XMLSchema#dateTime"; />
</oslc:Property>
</oslc:property>
This asserts that there is a resource, of rdf:type oslc:Property AND also
of rdf:type http://purl.org/dc/terms#modified
We don't mean this. We mean that the oslc:Property is indicated by an
RDF predicate http://purl.org/dc/terms#modified.
I suggest we change this part of the spec. to use rdf:predicate rather
than rdf:type. So the example becomes:
<oslc:property>
<oslc:Property>
<oslc:name>modified</oslc:name>
<oslc:occurs>exactly-one</oslc:occurs>
<oslc:namespace rdf:resource="http://purl.org/dc/terms#"; />
<rdf:predicate rdf:resource="
http://purl.org/dc/terms#modified"; />
<oslc:valueType rdf:resource="
http://www.w3.org/2001/XMLSchema#dateTime"; />
</oslc:Property>
</oslc:property>
-ian
[email protected] (Ian Green1/UK/IBM@IBMGB)
Chief Software Architect, Requirements Definition and Management
IBM Rational
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