Re: Setting values for variable

  Thanks for the solution David, but I forget to mention
  if There is no Balance tag coming back or Balance tag value is 0, instead of 
  calculating the Payment using 2% of Balance, we will substitute it with $10


<xsl:value-of 
  select="sum(Record/Payment) +
           0.02 * sum(Record[not(Payment)]/Balance[not(.=0)) +
           10 * count(Record[not(Payment)][not(Balance) or Balance=0])"/>


Ie: just write the thing in Xpath instead of English.
It really is easier to use declarative programming instead of imperative
programming: you just have to think like a normal person and not like a
FORTRAN programmer. If describing the sum of a certain class of elements
to a person you would never use this rather strange notion of "updatable
variables" You wouldn't say start with the sum being zero and then
iterate over the class of elements incrementing the sum with a new
value, You'd just describe the final result as a function of the input
not as a series of imperative programming steps. That is the essence of
declarative programming, you just describe the desired result and leave
it up to the compiler implementors what happens at the machine level.



David

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