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Re: Can RDDL and RDF coexist?

• To: xml-dev@l...
• Subject: Re: Can RDDL and RDF coexist?
• From: "Roger L. Costello" <costello@m...>
• Date: Wed, 05 Jun 2002 08:32:39 -0400
• Organization: The MITRE Corporation
• References: <000f01c20c22$3c29d0f0$887ba8c0@mitchum>

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

• Follow-Ups:
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    • From: "Thomas B. Passin" <tpassin@c...>
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    • From: Bill de hÓra <dehora@e...>

• References:
  • RE: Can RDDL and RDF coexist?
    • From: Bill de hÓra <dehora@e...>

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