Max value from a table

I need to find the largest value from a table and use that in calculating percentage values in my target XML document.

eg.
---- FROM ------
<?xml version="1.0"?>
<table>
   <row><col>25</col><col>7</col></row>
   <row><col>1</col><col>100</col></row>
</table>

-- 100 is the largest value in the table - now used to calculate each new cell as x / 100.

---- TO ------
<?xml version="1.0"?>
<table>
   <row><col>.25</col><col>.07</col></row>
   <row><col>.01</col><col>1</col></row>
</table>


Any ideas?
Thanks!
-- 

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