[jelly] bringing a jelly::core variable into an jelly::xml xpath

[Dan Ochs]

I'm trying to figure out a way to pass a variable from a jelly::core var 
into a jelly::xml XPath expression.  The document loading and parsing is 
working correctly. The following code does not raise an exception, but also 
does not return anything.  Any other combination I try rasises various 
exceptions, null pointer being the most common.
thanks for the help, dan

xml:
<groups>
  <group desc="I am your content description" name="content"/>
</groups>
jelly:
<xml:parse var="groups" xml="groups.xml"/>
<jelly:set var="input">$groups//[EMAIL PROTECTED]'content']/@desc</jelly:set>
<jelly:set var="desc">
  <xml:expr select="${input}"/>
</jellt:set>
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