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   Re: [xml-dev] Can RDDL and RDF coexist?

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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#”

      <rdf:Description about=“http://www.xfront.com//BookCatalogue.xml”>

            <book:Creator>Roger L. Costello</book:Creator>

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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