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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 state that contains one or more regions, each containing one or more direct substates.

See also complex transition, orthogonal region, orthogonal state, region, simple state, state.

Semantics

A composite state is a state with substates. A composite state can be decomposed, using and-relationships, into one or more regions, each of which is decomposed, using or-relationships, into one or more mutually exclusive direct substates. If a composite state is active, exactly one direct substate in each of its regions is active. The net effect is an and-or tree of active states. Each state machine has a top-level state, which is a composite state.

A composite state with exactly one region is a nonorthogonal state. If it is active, exactly ...

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