A boundary message event listens to a message being received while the activity upon which the event is defined is active.
A boundary message event is visualized as a circle with an envelope icon inside:

| Property | Description |
|---|---|
|
Id |
A unique identifier for this element. |
|
Name |
A name for this element. |
|
Documentation |
A description of this element. |
|
Message reference |
The message to listen to. Messages are defined on the root process definition level and are linked with this property. |