Looping Contexts: Enclosing and Nested

A loop expression specifies how a given output map element loops. It refers in some way to an input map element. Therefore, any input map element that is used in any subordinate (descendant) element of this output map element refers to a value from the looping input map element.

Looping contexts are specified using the NestedContext or EnclosingContext functions with the Contexts argument of the loop function.