RE: Can RDDL and RDF coexist?
Further, the RDF Syntax spec requires that the properties namespace must not only be a label, but, in fact, must be a valid URL to an RDF Schema document (which defines what the property means, thus enabling dynamic understanding of a property). That's my understanding. Is it an incorrect understanding? Yes it is incorrect. One of the odd things about RDF is though it is full of URIs, RDF processing doesn't involve URI dereferencing. URIs are used like keys. regards Nigel Hutchison Nigel W.O Hutchison Chief Scientist, W3C AC Representative Software AG Uhlandstr 12, D-64297 Darmstadt, Germany Tel +49 6151 92 1207 > -----Original Message----- > From: Roger L. Costello [mailto:costello@m...] > Sent: Wednesday, June 05, 2002 2:33 PM > To: xml-dev@l... > Subject: Re: Can RDDL and RDF coexist? > > > Bill de hÓra wrote: > > > > With RDDL a namespace may be used as a URL to a RDDL document. > > > > > With RDF a property's namespace must point to an RDF Schema > > > document. > > > > I'll stick my neck out an say this is not true. I checked the april > > 22 edition of RDFS <http://www.w3.org/TR/rdf-schema/> and didn't > > find that specification. The RDF MT defines an RDFS vocabulary as a > > set of URI refs and doesn't say anything about RDFS documents. > > > > [Not unrelated: an RDF property doesn't have a namespace but it > > does have a name, which is a URI reference. If an RDF property is > > placed in an XML namespace for serialization that's merely an > > implementation detail of the XML serialization. RDF is not an XML > > grammar.] > > > > Consider this RDF Syntax document: > > <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" > > xmlns:book="http://www.w3.org/TR/1999/PR-rdf-schema-19990303 > /dublin-core#"> > <rdf:Description > about="http://www.xfront.com//BookCatalogue.xml"> > > <book:Creator>Roger L. Costello</book:Creator> > </rdf:Description> > </rdf:RDF> > > Read this as: "This is a Description about the BookCatalogue.xml > resource. It has a Creator whose value is Roger L. Costello." > > It is my understanding that all properties (e.g., Creator) must be > namespace-qualified. Further, the RDF Syntax spec requires that the > properties namespace must not only be a label, but, in fact, must be a > valid URL to an RDF Schema document (which defines what the property > means, thus enabling dynamic understanding of a property). That's my > understanding. Is it an incorrect understanding? /Roger > > > > ----------------------------------------------------------------- > The xml-dev list is sponsored by XML.org <http://www.xml.org>, an > initiative of OASIS <http://www.oasis-open.org> > > The list archives are at http://lists.xml.org/archives/xml-dev/ > > To subscribe or unsubscribe from this list use the subscription > manager: <http://lists.xml.org/ob/adm.pl> >
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