attempt at dynamic sizing a table

If given the XML below how could you determine the max-string-length for
each column and then how would you convert that to cm or in?  I hope I am
clear enough

--XML--
<table>
 <row>
  <cell>
   A.
  </cell>
  <cell>
   B.
  </cell>
  <cell>
   C.
  </cell>
 </row>
 <row>
  <cell>
   There is some text here
  </cell>
  <cell>
   More text
  </cell>
  <cell/>
 </row>
 <row>
  <cell>
   A little text
  </cell>
  <cell>
   This cell contains more text than the one before
  </cell>
  <cell>
   Something goes here!!
  </cell>
 </row>
</table>

--Desired Output--
<table>
 <table-column column-width="5cm" /> <!-- Second widest -->
 <table-column column-width="8cm" /> <!-- Widest -->
 <table-column column-width="4cm" /> <!-- Smallest -->
    ...


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