Dave, This is a very old issue. rdf:predicate is not appropriate here since it implies that its subject is an rdf:Statement. See [1]. That is why we introducing an oslc property here.
I see that Dave Steinberg picked up the same problem. [1] http://www.w3.org/TR/rdf-schema/#ch_reificationvocab Regards, ___________________________________________________________________________ Arthur Ryman, PhD, DE Chief Architect, Project and Portfolio Management IBM Software, Rational Markham, ON, Canada | Office: 905-413-3077, Cell: 416-939-5063 Twitter | Facebook | YouTube From: Dave <[email protected]> To: oslc-core <[email protected]> Date: 05/26/2010 08:39 AM Subject: Re: [oslc-core] Comment on ResourceShape resources Sent by: [email protected] Thanks for the excellent feedback Ian and I agree pdf:predicate seems a much better fit here. I captured this issue on the issues page and applied your suggested change to the Resource Shape resource definition in appendix A. So far we are using two notions from RDFS: the notion of a resource definition, known as a class in the RDFS terminology, and rdf:predicate. Perhaps I should add RDFS to the list of references at the end of the spec. - Dave On Wed, May 19, 2010 at 8:02 AM, Ian Green1 <[email protected]> wrote: > 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 > > > > > > Unless stated otherwise above: > IBM United Kingdom Limited - Registered in England and Wales with number > 741598. > Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU > > > > > > > > _______________________________________________ > Oslc-Core mailing list > [email protected] > http://open-services.net/mailman/listinfo/oslc-core_open-services.net > _______________________________________________ Oslc-Core mailing list [email protected] http://open-services.net/mailman/listinfo/oslc-core_open-services.net
