Multiple Namespaces on an element with XSLT 1.0 - xslt

Question

I am using Microsoft's XSLT processor (1.0 only)
XML opening lines:
<?xml version="1.0" encoding="utf-8"?>
<Header xmlns="http:\\OldNameSpace.com">
<Detail>
Have the following XSLT template to pick up the <Header> element of my document and change its namespace.
<xsl:template match="*">
<xsl:element name="{name()}" xmlns="http:\\NewNameSpace.com">
<xsl:copy-of select="#*"/>
<xsl:apply-templates />
</xsl:element>
</xsl:template>
Which turns <Header xmlns="http:\\OldNameSpace.com"> Into <Header xmlns="http:\\NewNameSpace.com">
However I now need to add a second namespace to this so that I get the following output:
<Header xmlns="NewNameSpace.com" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
I have tried using:
<xsl:template match="*">
<xsl:element name="{name()}" xmlns="NewNameSpace.com" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<xsl:copy-of select="#*"/>
<xsl:apply-templates />
</xsl:element>
</xsl:template>
However I still only get the same output as the original XSLT template.
Can anyone enlighten to me as to why this is?

Answer 1

This transformation:
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:old="http:\\OldNameSpace.com"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
exclude-result-prefixes="old xsi">
<xsl:output omit-xml-declaration="yes" indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:param name="pNewNamespace" select="'http:\\NewNameSpace.com'"/>
<xsl:variable name="vXsi" select="document('')/*/namespace::*[name()='xsi']"/>
<xsl:template match="node()|#*">
<xsl:copy>
<xsl:apply-templates select="node()|#*"/>
</xsl:copy>
</xsl:template>
<xsl:template match="old:*">
<xsl:element name="{local-name()}" namespace="{$pNewNamespace}">
<xsl:copy-of select="$vXsi"/>
<xsl:copy-of select="#*"/>
<xsl:apply-templates />
</xsl:element>
</xsl:template>
</xsl:stylesheet>
when applied on the following XML document:
<Header xmlns="http:\\OldNameSpace.com">
<Detail/>
</Header>
produces (what I guess is) the wanted, correct result:
<Header xmlns="http:\\NewNameSpace.com"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<Detail/>
</Header>

Answer 2

xsl:element (unlike literal result elements) does not copy all in scope namespaces to the result, just the namespace required for the element name 9either implicitly from its name or as specified with the namespace argument).
xslt2 adds an xsl:namespace instruction for this case but in xslt1 the easiest thing to do is
where
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
somewhere on an ancestor (eg on xsl:stylesheet.)
that will add a spurious xsi:tmp="" to the output but also then a namespace declaration,
If you actually need an attribute in this namespace eg xsi:type use that instead of tmp in the above and you are done. If you don't mind the extra, possibly invalid attribute in the xsi namespace you are done. Otherwise do the above in a variable, then use msxsl:node-set to query in to the variable and remove the spurious extra attribute.

Answer 3

If you know statically what namespace you want to generate, then the easiest way to do it in XSLT 1.0 is using xsl:copy-of. Create a source document <dummy xmlns:xsi="http://whatever"/>,
and then do <xsl:copy-of select="document('dummy.xml')/*/namespace::xsi"/> inside your call of xsl:element.