You specify whether a superstate contains parallel (AND) states or exclusive (OR) states by setting its decomposition. A state whose substates are all active when it is active has parallel (AND) decomposition. A state in which only one substate is active when it is active has exclusive (OR) decomposition. An empty state's decomposition is exclusive.
To alter a state's decomposition, select the state, right-click to display the state's Decomposition context menu, and select OR (Exclusive) or AND (Parallel) from the menu.
You can also specify the state decomposition of a chart. In this case, the Stateflow chart treats its top-level states as substates. The chart creates states with exclusive decomposition. To specify a chart's decomposition, deselect any selected objects, right-click to display the chart's Decomposition context menu, and select OR (Exclusive) or AND (Parallel) from the menu.
The appearance of a superstate's substates indicates the superstate's decomposition. Exclusive substates have solid borders, parallel substates, dashed borders.
A parallel substate also contains a number in its upper right corner. The number indicates the activation order of the substate relative to its sibling substates.
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