Re: [xsl] Identifier attribute (was: Re: [xsl] Creating Hierarchy)

["Rowan Sylvester-Bradley" <rowan@xxxxxxxxxxxxxxxxxxxxx>]

Thanks for your help with this. Using the technique you've suggested I've 
been able to successfully add the id values with two separate XSL transform 
documents, but I can't get it to work as a two-pass process in a single 
stylesheet. My input file is this:
<?xml version="1.0"?>
<mytree>
<node>
  <name>Root of my tree</name>
  <level>0</level>
</node>
<node>
  <name>Child of root</name>
  <level>1</level>
</node>
<node>
  <name>Another child of root</name>
  <level>1</level>
</node>
<node>
  <name>Grandchild of root</name>
  <level>2</level>
</node>
<node>
  <name>Yet another child of root</name>
  <level>1</level>
</node>
</mytree>

My fisrt transform is:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; 
version="2.0">
  <xsl:output method="xml" indent="yes"/>
  <xsl:template match="/">
        <xsl:call-template name="next-level">
              <xsl:with-param name="level" select="0"/>
              <xsl:with-param name="nodes" select="//node"/>
        </xsl:call-template>
  </xsl:template>
  <xsl:template name="next-level">
     <xsl:param name="level"/>
     <xsl:param name="nodes"/>
     <xsl:if test="$nodes/level[.=$level]">
        <!-- then group the nodes at this level -->
        <xsl:for-each-group select="$nodes" 
group-starting-with="node[level[.=$level]]">
           <!-- act on the first of each group only, passing others to next 
level -->
           <newnode id="">
              <xsl:copy-of select="name"/>
              <!-- group at the next level assuming monotonically 
increasing level -->
              <xsl:call-template name="next-level">
                 <xsl:with-param name="level" select="$level + 1"/>
                 <xsl:with-param name="nodes" 
select="current-group()[position()&gt;1]"/>
              </xsl:call-template>
           </newnode>
        </xsl:for-each-group>
     </xsl:if>
  </xsl:template>
</xsl:stylesheet>

Which produces:
<?xml version="1.0" encoding="UTF-8"?>
<newnode id="">
  <name>Root of my tree</name>
  <newnode id="">
     <name>Child of root</name>
  </newnode>
  <newnode id="">
     <name>Another child of root</name>
     <newnode id="">
        <name>Grandchild of root</name>
     </newnode>
  </newnode>
  <newnode id="">
     <name>Yet another child of root</name>
  </newnode>
</newnode>

My second transform is:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; 
version="2.0"
 xmlns:xsd="http://www.w3.org/2001/XMLSchema";>
  <xsl:output method="xml" indent="yes"/>
  <xsl:template match="*[@id]">
    <xsl:copy>
      <xsl:attribute name="id">
        <xsl:number level="any" count="*[@id]"/>
      </xsl:attribute>
      <xsl:apply-templates/>
    </xsl:copy>
  </xsl:template>
  <xsl:template match="@*|node()">
    <xsl:copy>
      <xsl:apply-templates select="@*|node()"/>
    </xsl:copy>
  </xsl:template>
</xsl:stylesheet>

Which when run on the intermediate result produces:
<?xml version="1.0" encoding="UTF-8"?>
<newnode id="1">
  <name>Root of my tree</name>
  <newnode id="2">
     <name>Child of root</name>
  </newnode>
  <newnode id="3">
     <name>Another child of root</name>
     <newnode id="4">
        <name>Grandchild of root</name>
     </newnode>
  </newnode>
  <newnode id="5">
     <name>Yet another child of root</name>
  </newnode>
</newnode>

This is the correct result.

How do I combine these two transforms into a single stylesheet using the 
two-pass approach? I can't get this to work...

Many thanks - Rowan