Specifying xml source in xsl stylesheet

Is there any way to hard-code the xml file to be parsed by a particular 
xsl stylesheet?  I want to associate a menu.xml file with a menu.xsl 
stylesheet and then be able to include the menu.xsl in another xsl file. 
 The idea is to have the same menu always available for multiple files.
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"Firing people can give you a pretty good buzz, but it's a poor, poor 
substitute for killing.  I realize that now" - Dale Gribble

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