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- From: Jonathan Borden <firstname.lastname@example.org>
- To: Uche Ogbuji <email@example.com>, Arjun Ray <firstname.lastname@example.org>
- Date: Fri, 29 Dec 2000 13:58:30 -0500
Uche Ogbuji wrote:
> Arjun Ray quotes anonymous exchange from internal W3C list:
> > : For example, if some company starts using a name space prefix but
> > : doesn't define its vocabulary in some standardized way (so that any
> > : conforming tool can interpret it and validate against it), how can
> > : you ever know if you've handled all their names if you're tryin to
> > : compete with them by providing support for their data elements? You
> > : can't.
> Ding ding ding ding! Now for all those who didn't know what Paul meant by
> "Tool X", this is but one of the possible culprits (and possibly the most
> insidious). There might also be my example of a tool that retrieves a
> schema and makes processing assumptions differently from a tool that
> doesn't molest the namespace URI. There are other faces of tool X, and
> all of them are problematic in pratice regardless of the "rightness" of
> their behavior.
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.
The point is that without some type of schema one can never know what
elements might be contained in 'the next' document produced by a particular
tool. Whether the element names are QNames or are all of the form:
is totally irrelevent. Without either a prose specification or a machine
readable schema the vocabulary is not constrained.
Suppose I state:
Documents conformant to XXX must validate against the DTD locatable by a
Documents conformant to YYY must validate against an XSD locatable by the
document element namespace URI.
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.
What is the functional difference?
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