Sequence diagrams should be kept as simple as possible, and any message that is insignificant need not be shown. Figure A shows a sample sequence diagram with the following primary components: ...

UML is used as a representation of the Java programming language. Using sample class and sequence diagrams, you can see how UML conveys unambiguous code-mapping information to developers.

Figure 1 shows a simple Rhapsody (a UML tool from I-Logix) class diagram that illustrates the UML 2.0 structured class concept. An "ElevatorCar" is made up of a number of parts.