In hierarchical state machines, the states can be ordinary states or superstates which are state machines themselves. The notion of hierarchical state machines was popularized by the introduction of Statecharts, and exists in various object-oriented software...
CITATION STYLE
Alur, R. (2003). Formal Analysis of Hierarchical State Machines (pp. 42–66). https://doi.org/10.1007/978-3-540-39910-0_3
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