When you copy between variables, you copy directly from one variable (or part) to another variable of a compatible type, without needing to specify a particular field within either variable. In other words, you do not need to specify an XPath query.

You perform variable copying in the Copy Rules tab of the Edit Assign dialog, as shown in Figure 6-25.

For more information about the Copy Rules tab, see Manipulating XML Data with bpelx Extensions and Assign Activity.