In the Graphical
Data Mapping editor, use the
fn:sum or a Custom XPath transform to implement
an arithmetic operation.
Procedure
Choose one of the following transforms to implement an arithmetic operation to
set the value of an output element:

Use the fn:sum transform to calculate the sum of the values of
multiple input elements.
For more information, see fn:sum.

Use the Custom XPath transform to implement any of the following
arithmetic operations: addition (+), subtraction (), multiplication (*), division (div),
or any combination of these operations.
Note: You can only use as arguments of an arithmetic operation nonrepeating simple type
input elements.
For more information, see Custom XPath.