29.8. Additional Statechart Diagram Notation
The UML notation for statechart diagrams contains a rich set of features that are not exploited in this introduction. Three significant features are:
transition actions
transition guard conditions
nested states
Transition Actions and Guards
A transition can cause an action to fire. In a software implementation, this may represent the invocation of a method of the class of the statechart diagram.
A transition may also have a conditional guard—or boolean test. The transition only occurs if the test passes.
Figure 29.4. Transition action and guard notation.
Nested States
A state allows nesting to contain ...
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