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
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