[xsl] Nested <heading> levels inside <lev>

I was able to achieve what I needed with nested <heading> within <lev> by using
 
<xsl:value-of select="count(ancestor::lev)"/>
 
 
Input:
------
 
<lev>
  <heading>Level 1</heading>
 
  <lev>
    <heading>Level 2</heading>
 
 
    <lev>
      <heading>Level 3</heading>
    </lev>
 
    <heading>Level 2</heading>
 
  </lev>
 
  <heading>Level 1</heading>
 
  </lev>
 
</lev>
 
 
 
Output:
-------
 
<pStyle:hd1>Level 1
<pStyle:hd1>Level 2
<pStyle:hd1>Level 3
<pStyle:hd1>Level 2
<pStyle:hd1>Level 1
 
                                          
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