protocol state machine
A state machine used to specify the legal sequences of operation calls and signals received by an object.
Semantics
A behavioral state machine is an executable specification that converts events recognized by an object into a sequence of effects. Any sequence of events produces an outcome. By contrast, a protocol state machine specifies the legal sequences of events that may occur within the context of a classifier. It is not responsible for ensuring that a legal sequence occurs; the responsibility may lie with the caller or may be distributed over the design of a system. A protocol state machine merely defines the legal sequences, often to facilitate the design of the overall system that ensures that valid sequences occur. ...
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