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   Re: Round 2: How an XML instance document references an XML Schema

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  • From: David Carlisle <davidc@nag.co.uk>
  • To: xml-dev@ic.ac.uk
  • Date: Wed, 5 Jan 2000 13:37:37 GMT

maybe this is a stupid question, but _why_ does
take two URI ?

What is the point of the first one giving a namespace? It seems to be
one source of the complication, and currently I don't see how
it can be used.

After namespace processing the names in both the schema and the
document are all fully expanded to (uri,local-name) pairs, so it would
seem that the only question was whether these pairs matched and so I don't
see how the namespace URI in schemaLocation may be used. Having to have
a URI makes it difficult to refer to the unnamespaced case.

> A Schema-validating parser will use the URI to fetch the schema
> document, and then will verify that the targetNamespace value matches
> the namespace in schemaLocation.

Is this the _only_ use of the first URI, to generate an error if it is


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