XSLT grouping and summing

Question

I am new to XSLT and need to sum the total price (Quantity * UnitPrice) of items based on ID from each orders, and print it at the end of each Item\'s group using XSLT 1.0. Here

Answer 1

There are two problems here: (1) group the items by order and by item ID, and (2) calculate the subtotal for each such group.

The first problem is relatively easy and can be solved using the Muenchian grouping method. The second problem is more difficult, since XSLT 1.0 does not allow summing the result of a calculation.

The following stylesheet starts by pre-calculating the extended price of each item and storing the results in a variable. Then it operates on the variable, grouping the items and subtotaling each group.

XSLT 1.0

Demo: http://xsltransform.net/jz1PuPz