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)