Messages, written with horizontal arrows with the message name written above them, display interaction. Leaving the instance name blank can represent anonymous and unnamed instances. If the lifeline is that of an object, it demonstrates a role. This allows the specification of simple runtime scenarios in a graphical manner. "A sequence diagram shows, as parallel vertical lines (lifelines), different processes or objects that live simultaneously, and, as horizontal arrows, the messages exchanged between them, in the order in which they occur. Use it for object-oriented modeling of your bank information system. The vector stencils library "Bank UML sequence diagram" contains 34 shapes for drawing UML sequence diagrams.
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