Process Developer generates BPEL XML source code for each construct you add to the Process Editor. You do not need to save your file to see the source. Select the Source tab of the Process Editor to view or edit the source code.
You may notice that Process Developer automatically wraps process-level activities in a flow container if you do not and if a sequence or other container is not present. If Process Developer adds a top-level container for you, it does not appear on the Process Editor canvas or in the Outline view.