UML22 — UML SuperStructure - Inconsistency re State Machine terms

think there is some inconsistency in your usage of terms
in chapter 15 State Machines.

It isn't really clear (I think) what you mean sometimes when
you use the terms "state machine" "behavioral state machines"
and "protocol state machines".

In my (humble) opinion you should never use only the term
"state machine" when you do not mean both "behavioral state
machine" and "protocol state machine".

15.3.12 is a perfect example where I think there is confusion,
or at least lack of clarity, since you talk about "state machines" executing "activities". Clearly, not all state machines do--
more precisely--protocol state machines don't.

Discussion
This issue was resolved by the UML 2.5 convention of using explicit meta-class names (e.g., StateMachine and ProtocolStateMachine)
and by isloating the two types of state machines into distinct sections of the spec.
Disposition: Closed - No Change