recursion with xsl:apply-templates

Hi,

I have a problem with a recursion and I don't have a clue, why my 
solution does not work. I did not find anything on the web, so your help 
is greatly appreciated.
The problem:
I need to perform an XML to XML transformation to augment the data with 
unique keys.
The structure is as follows:
<transformation>
  <IRF>
    <HEADER>
      <REC_IR020_01 index="1">                  
        <UNB_S002_0004>16</UNB_S002_0004>
        ...
      </REC_IR020_01>
      <REC_IR030_01 index="1">
        <UNH_0062>03081402160553</UNH_0062>
        ...
      </REC_IR030_01>
     ...
  </IRF>
  <id_list>
    <id>2003-08-25 15:36:59.534096</id>
    ...
  </id_list>
</transformation>

I do not know all tag names, but I know that I have some elements with 
an index attribute, which I need to transform to
      <REC_IR020_01>                      
        <id>2003-08-25 15:36:59.534096</id>
        <UNB_S002_0004>16</UNB_S002_0004>
        ...
      </REC_IR020_01>
So I have to strip the index attribute and fetch one unique id from the 
id_list for each occurence of an index attribute.
My Solution:
I thought it's startightforward with XSL. My code:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; 
xmlns:xalan="http://xml.apache.org/xslt";>
  <xsl:output method="xml" indent="yes" encoding="UTF-8" 
omit-xml-declaration="no" xalan:indent-amount="2" />
  <xsl:strip-space elements="*"/>
  <xsl:template match="/transformation">
    <xsl:apply-templates select="IRF"/>
  </xsl:template>
  <xsl:template match="IRF">
    <xsl:copy>
      <xsl:copy-of select="@*"/>
      <xsl:apply-templates select="descendant::*"/>
    </xsl:copy>
  </xsl:template>
  <xsl:template match="node()">
    <xsl:param name="idCount" select="1"/>
    <xsl:choose>
      <xsl:when test="@index">
        <xsl:copy>
          <xsl:element name="test"><xsl:value-of 
select="$idCount"/></xsl:element>
          <xsl:call-template name="addIdElement">
            <xsl:with-param name="idCount" select="$idCount"/>
          </xsl:call-template>
          <xsl:apply-templates select>
            <xsl:with-param name="idCount" select="$idCount + 1"/>
          </xsl:apply-templates>
        </xsl:copy>
      </xsl:when>
      <xsl:otherwise>
        <xsl:copy>
          <xsl:apply-templates>
            <xsl:with-param name="idCount" select="$idCount"/>
          </xsl:apply-templates>
        </xsl:copy>
      </xsl:otherwise>
    </xsl:choose>
  </xsl:template>
  <xsl:template name="addIdElement">
    <xsl:param name="idCount"/>
    <xsl:element name="id">
    <xsl:copy-of select="/transformation/id_list/id[$idCount]"/>
  </xsl:template>
</xsl:stylesheet>

My problem is that the lines
          <xsl:apply-templates select>
            <xsl:with-param name="idCount" select="$idCount + 1"/>
          </xsl:apply-templates>
do not call the template with the inceremnted parameter, so it always 
runs with the default value 1.
Any ideas where my brain is scrumbled?
Volker.



XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list