[xsl] Read from 2 xml files and sum values!

Hi All.

I have a need to read 2 xml files and make a count of the numbers in
them and write out as a text file. Currently, I am doing it with one
xml file as input which is straight forward. I am not sure how to read
2 xml files. Can some one please educate me ?

The request xml files are identical...

request xml file - 1:
---------------------------
<MessageCounts>
     <Monitor class="CountMonitor">IncomingRequest</Monitor>
     <Total>152</Total>
</MessageCounts>

request xml file - 2:
---------------------------
<MessageCounts>
     <Monitor class="CountMonitor">IncomingRequest</Monitor>
     <Total>148</Total>
</MessageCounts>

Result text file:
---------------------
IncomingRequest : 300

Thanks.
--
Suresh