XSL - sum multiplication of elements

Question

I have a few items like this one:

    172
    42         


        

Answer 1

In addition to the correct answer by Kirill:

I. XPath 2.0 (XSLT 2.0) solution:

Use this single XPath 2.0 expression from any language hosting XPath 2.0:

sum(/*/*/(quantity*unit-price))

Here is a complete example using XSLT 2.0 as the host of XPath 2.0:

when applied on the following XML document:

    
        1
        2
        7
    
    
        10
        20
        7
    
    
        100
        200
        7
    

the wanted, correct result is produced:

20202

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II. XSLT 1.0 solution using the transform-and-sum template/function of FXSL 1.x

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

20202

Do note: Using FXSL one doesn't need to implement explicit recursion "for the Nth time", the solution is compact and potential errors writing the recursion are eliminated altogether.

As a whole the total development time, readability and flexibility are dramatically improved.