XSL Param or Attribute?

I need some help creating a dynamic variable..

I need to set up a variable that you can add to:

Can something like this be done --> This will be a for-each clause which will be looping through each set of node finding a child node, lets just say named = "amount"

so for example:


Code:
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x

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Code:
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0






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What i need to is set up a dynamic variable like this " current_value = current_value + amount "

So every time it goes through and hits the node amount it adds it to the current_value?

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