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 to design your sequence diagrams using ConceptDraw PRO diagramming and vector drawing software. This vector stencils library contains 32 SysML symbols. ![]() This example of bank ATM sequence diagram was created using the ConceptDraw PRO diagramming and vector drawing software extended with the ATM UML Diagrams solution from the Software Development area of ConceptDraw Solution Park. In the example, the Bank timeline has an X simply as an example (presumably the Bank does continue to exist)." An X on a timeline indicates that the component ceases to exist in some sense (unsure precisely how this is meant also). The narrow rectangles apparently show when a component is active (unsure precisely what "active" means). ![]() The timelines are dotted rather than solid, and the name of the component is inside a box at the head of each timeline. Presumably the same semantic issues arise, but possibly not since UML semantics are not well-defined. "A UML sequence diagram or SD is similar to an MSC but written with a different notation. This example of automated teller machine (ATM) UML sequence diagram was created on the base of figure 5 "Sequence diagram" on the webpage "Message Sequence Charts and their Ilk" from the website of the University of California Irvine (UCI) Donald Bren School of Information and Computer Sciences.
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