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People *are* indeed always using the same prefixes (xsl, xsd, xsi...)
and declaring them in the root...
some people are but much XML isn't written by people.
If you generate a mixed namespace document with XSLT (and probably many
other systems) the natural place that the namespace declarations appear
is on each use not at the top of the document, as XSLT is designed to
allow the result document to be linearised as it is generated, so there
is no way of telling it to back up and add a namespace declaration at
the top if you discover half way through generating your XHTML document
that you need to add some svg or mathml or something. It was of course
concerns such as this that led to the namespace rec allowing
declarations mid document in the first place.
The annoying exceptions can very clearly be marked by any implementation
as not supported, and it is quite easy to turn an unsupported XML
document into a supported one (changing, moving prefixes).
Easy with a text editor, but is it easy with "XML programming languages"
such as Xquery or XSLT?
David
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