numbering the result tree

hi
I have a simple xml tree like this :
<main>
	<list>
	      <objects> </objects>
	      <objects> </objects>
	      <objects> </objects>
	      <objects> </objects>
		<list>
	           <objects> </objects>
	           <objects> </objects>
	           <objects> </objects>
	           <objects> </objects>
		     <list>
	               <objects> </objects>
   	               <objects> </objects>
	               <objects> </objects>
	               <objects> </objects>
		     </list>
		</list>
	</list>
</main>
each list have its objects and other lists that can have lists that can have
lists .......
I built a simple xsl that transfer this xml to another xml but I need to
give the result tree numbers that will define the tree ! .
I need that the first list will be 1, 2, 3... N  and all the nodes under a
certain list will be X_1, X_2, X_3 ... X_N
(where x is the father number) etc.
my result tree should be unlimited in his depth (as deep as the source tree)
this is my xsl :
----------------
<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/TR/WD-xsl">

<xsl:template match="/">
   <xsl:apply-templates />
</xsl:template>

<xsl:template match="main">
   <xsl:apply-templates />
</xsl:template>

<xsl:template match="list">
   <!-- this is where i need to put the number that represent the node -->
  <xsl:apply-templates/>
</xsl:template>


<xsl:template match="object">
   <!-- irrelevant  -->
	<xsl:apply-templates/>
</xsl:template>


</xsl:stylesheet>


hope I made my self clear, and thanks for the help
shlomi











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