Description A Message Flow is used to show the flow of messages between two participants who are prepared to send and receive them. - A Message Flow must connect separate Pools. It can be connected to the pool boundary or an element inside the pool.
- A Message Flow cannot connect two elements in the same Pool.
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Messages that are sent by a Message Flow can be displayed on a diagram in two ways: - overlapping the Message Flow
- associated with the Message Flow
However, they can also be hidden. 
Message Flows between two pools.
Messages overlapping Message Flows
Message Flows between Pools Inner elements
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