<xsl:text disable-output-escaping="yes">
 <![CDATA[
<myheader xsi:schemaLocation="www.abc.org/schema/mainschema.xsd"


using d-o-e is almost always the wrong thing to do.

the namespace name is part of the name of the element so
you don't want to 
<xsl:copy-of select="$imported-xml"/>
You want to do as you would have done with any other name change: apply
templates to these nodes that make the change,

<xsl:apply-templates select="$imported-xml/*" mode="x"/>

(you don't need a variable you could just as well go

<xsl:copy-of select="document('imported.xml')/*" mode="x"/>

then something like

<xsl:template mode="x" match="*">
 <xsl:element namespace="www.abc.org" name="local-name()">
  <xsl:copy-of select="@*"/>
  <xsl:apply-templates mode="x"/>
 </xsl:element>
</xsl:template>

the "x" mode just renames any element it finds into the "www.abc.org"
namespace.

Alternatively of course you could add xmlns="www.abc.org" to the top
level element of your imported.xml so the elements were in the right
namespace to start with, then your original stylesheet would work.

David

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