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- From: "Simon St.Laurent" <simonstl@simonstl.com>
- To: xml-dev@lists.xml.org
- Date: Fri, 29 Dec 2000 14:25:28 -0500
At 01:58 PM 12/29/00 -0500, Jonathan Borden wrote:
> I'm not sure that anything in this argument is unique to either
>namespaces or whether a schema is retrieved by URL. Isn't this simply a
>question: given a document how can you define its vocabulary?
>
>1) look at the DTD indicated by a doctypedef.
>2) look at an XML Schema indicated by a schemaLocation URI
>3) look at an RDF Schema indicated by a namespace URI.
Perhaps, though you left out the possibility someone mentioned here earlier
of multiple definitions for a single namespace - the three DTDs for XHTML
case, for instance.
>Documents conformant to XXX must validate against the DTD locatable by a
>DOCTYPE definition.
>
>-or-
>
>Documents conformant to YYY must validate against an XSD locatable by the
>document element namespace URI.
DOCTYPEs and namespaces exist independently (even in contradiction) at
present...
>Leaving aside the public id FPI and assuming we are talking about a system
>identifier (for the purposes of constraining this discussion) each mechanism
>provides a single system identifier by which a schema is to be located.
Again, that 'single' business is troubling...
Simon St.Laurent
XML Elements of Style / XML: A Primer, 2nd Ed.
XHTML: Migrating Toward XML
http://www.simonstl.com - XML essays and books
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