Currently supported elements:
Embedded Sub Process
An embedded sub process can be used to group workflow elements. It must have a single none start event. When activated, execution starts at that start event. The sub process only completes when all contained paths of execution have ended.
<bpmn:subProcess id="shipping" name="Shipping"> <bpmn:startEvent id="shipping-start" /> ... more contained elements ... </bpmn:subProcess>
When a subprocess completes, the payloads of each executed end event are merged into the result document of the subprocess. See the end events section for how to configure the merge.