xslt to process two xml documents?

Hi XML Gurus,

I  have two xml documents which need to be processed and the output xml is
to be 
created from a combination of elements of the two xmls  mostly using copy
function and with some additions during XSLT.

I have been creating an xslt and applying it to a xml document to obtain the
result.

Any pointers to documentation will be highly appreciated.


thanks for help in advance
Harsha 

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