> I have xml document like following...  
> ==========
> 
> <de>German Text</de>
> <en>English Text</en>
> 
> ==========
> I have an variable "$lang" which can be "de" or "en".
> 
> Now I want to extract /de or /en
> depending on variable $lang.
> 
> I am trying something like
>  <xsl:value-of select="node($lang)"/>
> 
> But I cant get the result!!

Guessing the syntax of a programming language is not a particularly
productive strategy. Get yourself a book that introduces XSLT and XPath, and
follow the instructions.

You want select="*[name()=$lang]".

Michael Kay