How to get rid of some namespace declarations

Hi List,

I have some input documents (from xslt 1.0, xforms), which I want to
assemble into one single document by using the xsl:collection
function. But I seem not to be able to get rid of some namespace
declarations!

Input (many of them):
<?xml version="1.0" encoding="UTF-8"?>
<openimmo xmlns="http://www.openimmo.de"
   xmlns:xf="http://www.w3.org/2002/xforms"
   xmlns:im="http://www.openimmo.de"
   xmlns:ic="http://www.example.com">
   <ic:auftraggeber>
      <ic:name/>
   </ic:auftraggeber>
   <anbieter>
      <immobilie>
         <objektkategorie>
            <ic:objektart>wohnung</ic:objektart>
         </objektkategorie>
      </immobilie>
   </anbieter>
</openimmo>

XSLT:
<?xml version="1.0" encoding="UTF-8" ?>
<xsl:stylesheet version="2.0"
   xpath-default-namespace="http://www.openimmo.de"
   xmlns="http://www.openimmo.de"
   xmlns:im="http://www.openimmo.de"
   xmlns:ic="http://www.example.com"
   xmlns:xf="http://www.w3.org/2002/xforms"
   exclude-result-prefixes="im xf"
   xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:strip-space elements="*"/>
<xsl:output method="xml" indent="yes" omit-xml-declaration="no"/>

<xsl:template name="init">
   <xsl:result-document href="../ns-test/test_2009_06_11.xml">
      <openimmo xmlns="http://www.openimmo.de"
         xmlns:ic="http://www.example.com">
         <xsl:apply-templates
select="collection('../ns-test?select=fertig*.xml')"/>
      </openimmo>
   </xsl:result-document>
</xsl:template>

<xsl:template match="openimmo|anbieter">
   <xsl:apply-templates select="*"/>
</xsl:template>
<xsl:template match="openimmo/ic:auftraggeber"/>
<xsl:template match="immobilie[not(ic:auftraggeber)]">
   <xsl:copy>
      <xsl:copy-of select="/openimmo/ic:auftraggeber"/>
      <xsl:apply-templates select="*"/>
   </xsl:copy>
</xsl:template>
<xsl:template match="objektkategorie/ic:objektart">
      <objektart>
         <xsl:element name="{.}" namespace="http://www.openimmo.de"/>
      </objektart>
</xsl:template>
<xsl:template match="@*|node()">
   <xsl:copy>
      <xsl:apply-templates select="@*|node()"/>
   </xsl:copy>
</xsl:template>
</xsl:stylesheet>

Output (using Saxon 9.1.0.5J )
<?xml version="1.0" encoding="UTF-8"?>
<openimmo xmlns="http://www.openimmo.de"
   xmlns:ic="http://www.example.com">
   <immobilie xmlns:xf="http://www.w3.org/2002/xforms"
      xmlns:im="http://www.openimmo.de">
      <ic:auftraggeber>
         <ic:name/>
      </ic:auftraggeber>
      <objektkategorie>
         <objektart>
            <wohnung/>
         </objektart>
      </objektkategorie>
   </immobilie>
</openimmo>

What I would like to see:
<openimmo xmlns="http://www.openimmo.de"
   xmlns:ic="http://www.example.com">
   <immobilie>
...
I'm sure this can be achieved, but have been running out of ideas.

Manfred