Sum of Multiplied Values

Question

I have a fairly convoluted XML file and I need to do a weighted average of a few values within it using XSL. I am able to complete a sum of the weights OR of the values, but I c

Answer 1

For completeness, if you want to sum over a computed quantity in XSLT 1.0, there are three ways of doing it:

(a) recursion: write a recursive template that processes the items in the sequence one by one, computing the total as it goes.

(b) create an XML tree in which the computed quantities are node values, and then process this tree using the sum() function. To do this in a single stylesheet you will need the exslt:node-set() extension function.

(c) use an extension function provided by the XSLT vendor, or user-written using the facilities provided by the vendor for calling external functions.

In XSLT 2.0, it can always be done using the construct

sum(for $x in node-set return f($x))

where f is a function that computes the quantity.