BPEL often requires nested activities, such as those in a
, if, while, or
. BPMN (on the left below) represents nesting with control flow arrows. In the
example, note also that the control flow contains an embedded (hidden) sequence. The sequence contains start and end events, and you can add activities in between. The start and end events are considered good style in BPMN, but are not strictly required, so they can be deleted if desired. Process Developer Classic displays a
container with an embedded, visible scope into which you add all activities manually.