Passenger services accepts (4) the request, generates the passenger list, and sends the passenger list back to baggage transportation (6). Reading Sequence Diagrams Figure 5.10 Sequence diagramįigure 5.10 shows that as soon as the prerequisite (2) is fulfilled, baggage transportation requests a passenger list from passenger services (1). However, the sequence diagram adds the chronological aspect. In the system integration model, the message flow of the sequence diagram corresponds to the object flow of the activity diagram: The message flow goes from the sender of the message to the receiver. Information is transferred as arguments:Īrguments can be business objects (see Messages in UML). In sequence diagrams, messages are understood as operations of events. In the system integration model, these objects represent the interacting IT systems: Message Objects exchange messages with each other. In sequence diagrams as shown in Figure 5.9 we work with the following elements: Object The system integration model illustrates the message exchange between IT systems: Figure 5.8 Sequence diagram “No Boarding” Figure 5.9 Elements of the sequence diagram The focus of sequence diagrams lies in the illustration of the chronological sequence of message exchange between objects as shown in Figure 5.8.
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