sort and sum

Hi ,
i want to get the sum for elements after 10 top  elements

my xml is like this
< sproot >
      <row num='1'>
          <col num='1'>19</col>
     </row>
      <row num='2'>
          <col num='1'>11</col>
     </row>
    ...

</sproot>

i want to get the sum on col after the 10th top position
means i want to sort first on col , after that i want to get sum after 10 position


plz any body can help me in that





Maneshi Tuli
  212-454-1646 (O)
  732 -882-0353(H)



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