System Process Sequence Flows, Events and Message Flows
Sequence flows
Organization of tasks in the system process is represented by sequence flows between tasks.
A sequence flow is used to show the order in which steps of an exchange contract will be performed. A sequence flow has only one source and only one target.
Events
Events represent facts occurring during process execution.
An event represents a fact or an action occurring in the system, such as updating client information. It is managed by a broker. An application indicates that it can produce the event by declaring that it publishes it. If an application is interested in an event, it declares that it subscribes to the event.An example is the start or end of the system process.
Start
Final
The event can also be sending or receiving a message flow.
Message flows
Message flows represent exchanges between the system process and the exterior.
A message flow represents circulation of information within an exchange contract. A message flow transports its content.
A message flow can be linked to an event of message type.