Defining a key for a string in another xml document

Hi,
 I've to define a key to get the content of a tag from another xml file.
I've defined a key to retrieve the content in the current xml document
like this:

<xsl:key name="CurrentGroupByIdentifier" match="group"
use="identifier[1]"/>
 
 But how to do this for another xml file?
 
 Jarno suggested how to search a string in another xml file like:

document($filename, /)/descendant::text()[contains(., $yourString)]

Any idea?

Thanks and regards,
Ram



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