xpath and variables

Hi All,
 
Help , help.
 
I'm working on a XSL doc 
1) which scans XML-Doc1 to construct an Xpath --
assigns to a variable
2) Gets the data from XML-Doc2 based on the generated
xpath.
 
Now in my XSL I need to use 
 
<xsl:value-of select $var1/$var2 />
 
example:
 
<xsl:variable name="docdataXML"
select="document('foo.xml')/>
<xsl:variable name="path" select="//level1/level2" />
-- Note that this is dynamically created. I've hard
coded for example
 
<xsl:value-of select="$docdataXML/$path"/>
 
$docdataXMl was evaluated to a nodelist. But $path
does not seem to act on it.
 
Any suggestion on how to get this working is
appreciated.
 
Thanks
 
 
Selvi.


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