This panel specifies how the output map element is to loop. Typically, this specification is automatically generated as you map elements from the input to the output. The loop expression panel appears only when you select an output map element that can loop.
The root of the loop expression must be a loop function. The main loop function is SimpleLoop which requires the specification of an input map element that defines the looping for the output map element that contains the loop expression. See the Looping Expressions section for more details.