EnterExit points
EnterExit points are used to represent the entry to / exit from sub-statecharts.
At the level of the parent state, these points represent entry to / exit from the various contained substates without revealing any information about the specific substate that the transition connects to.
At the level of the sub-statechart, these points represent the entries to / exits from the parent state vis-a-vis the other elements in the statechart.
When you create a sub-statechart from a parent that contains deep transitions (that is, transitions entering one of the substates), EnterExit points are automatically created on the borders of the parent state in both the sub-statechart and the original statechart.