How to do this without updating a variable?

Hi, 
  I have seen past postings about the fact that variables cannot be updated. But I'm not sure how
to solve the following problem without variable update!

Input:

<top>
  <a>
    <reg count="5"> A0 </reg>
    <reg count="10"> A1 </reg>
  </a>
  <a>
    <reg count="10"> A2 </reg>
  </a>
</top>

Output:

  Node : start      end
  A0   :   1    -    5
  A1   :   6    -   15
  A2   :  16    -   25

--------------------------
So basically output of any node <reg> is based on all the <reg> nodes that have been processed
before it. If I could use a temporary variable, I would have just kept a running total of the
total "count" prior to processing that node.

Could someone suggest a solution or give me some pointer?

Thanks,
Anupam.



	
		
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