I am trying to extract values from two XML files that follow different schema
to make an HTML form. 

The following description is a simplified version of what I am trying to do.

The first file is like this: (first.xml)
   <Object>
      <Entry key="/a/b/c/d">
          defg
      </Entry>
      ....
    </Object>

The second XML file is like this (second.xml):
    <a>
      <b>
         <c>
            <d>
              this value is what I want
            </d>
          </c>
        </b>
      </a>

I am using Perl/LibXSLT/LibXML/XPath etc.

My XSL file works on the first file ...
    <xsl:template match="Object">
        <xsl:apply-templates select="Entry">
    <xsl:template>
    <xsl:template match="Entry">
         ....    ???? What do I use here to get the value of looking up @key  
                      in second.xml ????
     </xsl:template>

I have looked at the document() function in XSLT ... So, I could do:
       <xsl:value-of select=document('second.xml')/a/b/c/d>

However the problem is I need to "parameterize" the /a/b/c/d nodename that 
needs to be looked up. So, for example if the key attribute is /j/k/l/m
I need to look up the XPath expression /j/k/l/m in second.xml and output
this from the XSL file. All the documents I have researched on the net only
show the "hard-coded" lookups from the second file i.e. they assume that you 
know the name of the node that needs to be looked up.

How do I generalize the document()/.... so that it works for any value of @key
from first.xml ?

Anything I try using <xsl:variable> stuff and using document()/$variable 
gives me an invalid expression error.

---

Clarification of Question by subu62-ga on 06 Apr 2004 03:32 PDT

Regarding the comment posted:
 Once you have set a variable's value, you cannot change or modify that value!
 You can only change "parameters". However, anytime I do document(...)/$var
  I get an invalid expression error.

Hi Subu ,
First of all <xsl:variable> works in IE 6.0 and NN(Netscape)6.0 .

I think u can xsl:variable easily  intially u can store some dummy
value in variable and when u get the actual nodes(i.e /a/b/c/c or
/l/m/n/o whatever)
u can store that value in variable .

two references i'm suggesting 

http://www.w3schools.com/xsl/el_variable.asp

http://msdn.microsoft.com/library/default.asp?url=/library/enus/xmlsdk30/htm/xmcongettingstartedwithxslttutorial.asp

the msdn source is very very good also ..
www.w3schools.com have  very good tutorial and examples for xslt etc etc.

Due to time shortage i couldn't give u complete solution  to ur problem.
hope u find the solution ..

Thanxs ,
Samrat.A.Barve