Wanted: All unique namespaces in a document

Hi,

I'm trying to write an XSLT sheet extracting all unique namespaces used in a
document. My processors of choice are Xalan 1.0.0 and SAXON, as current XT
does not support the namespace:: axis. The results are, err, quite random.
And I haven't tried Oracle yet :)

(1) First attempt:

		<xsl:for-each select="//namespace::*">
			<xsl:value-of select="."/>
		</xsl:for-each>

In Xerces, this yields a namespace-uri for each element with an xmlns:foo
attribute (including doublets). In SAXON it outputs many, many
namespace-uri. I guess it may return all namespaces visible from each
element.

(2) Second attempt:

		<xsl:for-each select="
			//*
				[not( namespace-uri(.) = namespace-uri(preceding::.))]
			">

			<xsl:value-of select="namespace-uri(.)"/>
		</xsl:for-each>

Fails in SAXON (illegal construct preceding::.). In Xerces it does not fail,
and returns the namespace URI string for each element in the document.

Anyone with a clue for a solution that (at least in theory) works ?

Regards,
	++im


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