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Submachine State
A submachine state is semantically equivalent to a composite state but adds the mechanism for the submachine state to be reused in different contexts through the provision of entry and exit point connection references. Entry and exit to the submachine state is always through the connection point references which are part of the submachine state definition. A state is not permitted to have both regions and submachine states.
Explanation
A submachine state is a mechanism to decompose and reuse portions of a state machine in different contexts. The submachine state is similar to a composite state but defines connection point references which provide targets for incoming transitions and sources for outgoing transitions. This mechanism makes the submachine state a modular unit within a state machine allowing it to be reused and giving the modeler the mechanism to create decomposition hierarchies.
