An Event SubProcess is an ordinary SubProcess whose Triggered By Event property is set to true. It is not a part of a normal flow of its parent process - there is no incoming or outgoing sequence flow.
An Event SubProcess may occur many times. Unlike the standard SubProcess that uses the flow of the parent process as a trigger, it has a Start Event as a trigger. Whenever the Start Event is triggered while the parent process is active, the Event SubProcess will start.
The Start Event icon of a collapsed Event SubProcess will be displayed on the top left corner of the SubProcess.
Notation
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