The following images show a series of MAP steps in a flow service. In this example, the value of the source variable is changed after the link to the target variable executes. This action changes the value of the target variable as well.

When this flow service executes, it returns the following results.

In Step 3, the value of the String1 in Document1 was set to “modified.” However, the value of String1 in Document2 changed also. This is because in Step 2 of the flow service, the value of Document1 was copied to Document2 by reference. Changes to the value of Document1 in later flow steps also change the value of Document2.