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Unified Modeling Language Reference Manual, The, Second Edition by Grady Booch, Ivar Jacobson, James Rumbaugh

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Composite State

A simple state has no substructure, just a set of transitions and possible entry and exit activities. A composite state is one that has been decomposed into regions, each of which contains one or more direct substates. Table 7-3 lists the various kinds of states.

Table 7-3. Kinds of States
State KindDescriptionNotation
simple stateA state with no substructure
orthogonal stateA state that is divided into two or more regions. One direct substate from each region is concurrently active when the composite state is active.
nonorthogonal state ...

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