[ZIZope] Calculate a sum of values with dtml

Hi all.
My answer is: is it possible to make a sum of a sequence of numbers with 
dtml?
That is: I have a result of a ZSQL method which a field is a 
floating-point data.
I would like to do that

<dtml-in sql_sequence>
... total calculation in some manner...
</dtml-in>

<dtml-var total_is fmt="%.2f">

Any idea?

Thanks to all

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