Description A Message Boundary Event is triggered by an arrived message. Once triggered, it changes a normal flow into an exception flow or parallel. A Message Boundary Event displays any of the following on the diagram: - A Message Boundary Event name if the name is specified.
- A Message Ref property value if the name is unspecified.
- An Operation Ref property if the name and Message Ref are not specified.
Notation - Message Boundary Event (Cancel Activity - True)
 - Message Boundary Event (Cancel Activity - False)
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