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Entry Connection Point Reference
An entry connection point reference represents the entry point to a submachine state. It provides a target for a transition to a submachine state and is the only way that a submachine state can be referenced. A submachine state may have any number of entry connection point references and these represent entry point pseudostates defined in the submachine state.
Explanation
A submachine state is a mechanism for reusing or structuring states and is typically included in higher-level diagrams, an entry connection point reference provides a way to connect to the submachine state. It has the same appearance as an entry point pseudostate but lies on the border of the submachine state. Transitions that target an entry connection point reference are effectively targeting an entry point pseudostate that is defined in the submachine state. It is an analogous (but different) concept to a port for a class: it acts as an external point of connection and limits the modeler's need to know about the internal structure of the submachine state.
An exit connection point reference is related to an entry connection point reference because they are paired elements and typically appear together, one used to mark the points of exit and the other marking the single point of entry to a submachine state.
A submachine state is related to an entry connection point reference because they are used together. The entry connection point reference provides a way for a modeler to reuse the submachine state targeting this node as the entry point without the need to know the internal working of the submachine state.