Aggregate-function for sum and product in XPath

Question

Similar to this question (http://stackoverflow.com/q/1333558/948404) I want to use XPath to calculate a sum over products in a structure like this:

Answer 1

Use this XPath 2.0 expression:

sum(/items/item/(value * quantity))

Here is an XSLT 2.0 transformation as verification:

When this transformation is applied on the provided XML document:

    
        1.0
        3
    
    
        2.5
        2
    
    

the XPath expression is evaluated and the result of this evaluation is output:

8

Explanation:

In XPath 2.0 it is legal for a location step to be

/(expression),

or even

/someFunction(argumentList)

---

II. XSLT 1.0 solution:

when this transformation is applied on the provided XML document (above), again the wanted, correct result is produced:

8

Do note: Such kind of problems are easy to solve using the FXSL library. The template to call is transform-and-sum .