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   About XML document linkage and Schemas.

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  • From: "Didier PH Martin" <martind@netfolder.com>
  • To: "'XML Dev'" <xml-dev@ic.ac.uk>
  • Date: Wed, 24 Nov 1999 20:44:58 -0500


Don Box sent me a very good comment about XML fragment/document linkage to
their schemas.

That is one approach discussed in the Schema WG composition task force
report (http://www.w3.org/TR/1999/WD-xmlschema-1-19990924/composition-t
f.html). The current schema WD does not specify which (if any) of these
approaches will be used unfortunately.

BTW, overloading the xmlns attribute to locate schema docs would break
a lot of existing XML (most of my xmlns URIs have been UUIDs lately) in
addition to making it more difficult to compare two elements for type
equivalence. I am all for using a well-known XML attribute per element
to associate schema with instances, but I don't think overloading the
existing xmlns attribute is a good idea.

Didier reply:
Don is right, we have, in the field, several documents using diverse URI for
name space references. things like

URN, URL, etc..

These URI are not necessarily resolvable into a location and a schema
document stored at this place. Thus, we are still in front of the wall: How
to link an XML fragment to its schema?
And in the same vein: how do we link a document to its meta data?

Didier PH Martin

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