Multiple XML into one XSL and sorting the result

I have a XML and XSL.  The XSL displays records from the XML based on some
criteria entered by the user in a form.  The XSL gets that criteria from
the  URL parameters and is stored in <xsl:param>.  This part is working
fine.  But i don't know how to do the following...

1)  After getting the initial result, have the XSL search another 2 XML
documents using the same criteria entered by the user.
2) After getting the results from all the 3 XML documents it sorts the
output based on date.  (Date is a element of each record retrieved).

Thanks for your help.

Nehal



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