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At 12:44 PM -0800 3/10/04, Tim Bray wrote:
>Er, I thought that canonical XML required that namespace names be
>declared only at the first point they're used. Am I wrong?
>If I'm right, it's a big problem; it means you can't have a qname in
>an attribute value unless that namespace has already been used in a
>containing element or one of its attributes. So I'm probably wrong.
You're wrong. :-) Namespaces are output when they first come into
scope, not when they're first used. This is covered in section 2.3 of
the canonical XML spec. The key thing is to remember that in the
XPath data model on which canonical XML is based, the namespace axis
contains all namespaces in scope on the element, not simply those
declared or used.
Elliotte Rusty Harold
Effective XML (Addison-Wesley, 2003)