Description A Message Start Event means that a message from a participant has arrived and triggered the start of a process. A Message Start Event displays any of the following on a diagram: - A Message Start 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 - Interrupting Message Start Event
 - Non-interrupting Message Start Event
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