ebene Struktur in Baumstruktur

[Alex Schneider]

Ich habe es nun doch selber lösen können.
Hier das XSLT-Skript:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fo="http://www.w3.org/1999/XSL/Format">
 <xsl:template match="/">
  <VERZEICHNIS>
   <xsl:apply-templates select="//object[attribute::level=1]" mode="NEXT">
   <!-- This selects ALL elements <object level="1"> -->
    <xsl:with-param name="LIMES" select="number(1)"/>
    <!-- start-value of the parameter $LIMES is 1 -->
   </xsl:apply-templates>
  </VERZEICHNIS>
 </xsl:template>

<xsl:template match="object" mode="NEXT">
 <xsl:param name="LIMES"/>
  <xsl:if test="@level = $LIMES">
  <!-- These are the searched elements -->
   <xsl:element name="DING">
     <xsl:attribute name="EBENE">
      <xsl:value-of select="./@level"/>
     </xsl:attribute>
     <xsl:if test="$LIMES + 1 = following-sibling::object[1]/@level">
     <!-- Is the next object-element one level higher? -->
      <xsl:apply-templates select="following-sibling::object[1]" mode="NEXT">
      <!-- recursion, search on -->
       <xsl:with-param name="LIMES" select="$LIMES + 1"/>
       <!-- In XSL, the variables are only valid inside their frame, C++ like! -->
      </xsl:apply-templates>
     </xsl:if>
   </xsl:element>

</xsl:if>
   <xsl:if test="$LIMES <= following-sibling::object[1]/@level">
   <!-- Is the next object-element on the same level? -->
    <xsl:apply-templates select="following-sibling::object[1]" mode="NEXT">
    <!-- recursion, search on -->
     <xsl:with-param name="LIMES" select="$LIMES"/>
    </xsl:apply-templates>
   </xsl:if>
</xsl:template>
</xsl:stylesheet>