UML14 — In v1.4, section 3.84.1 the paragraph on semantics

"An Activity Diagram is a special case of a state machine in which the
states represent performance of actions or subactivitities and the
transitions are triggered by the completion of actions or subactivities. It
represents the state machine of a procedure itself."

But in Section 2.13.1 it says:

"An activity graph is a special case of a state machine that is used to
model processes involving one or more classifiers. Its primary focus is on
the sequence and conditions for the actions that are taken, rather than on
which classifiers perform those actions. Most of the states in such a graph
are action states that represent atomic actions; that is, states that invoke
actions and then wait for their completion. Transitions into action states
are triggered by events, which can be

• the completion of a previous action state (completion events),
• the availability of an object in a certain state,
• the occurrence of a signal, or
• the satisfaction of some condition.
  "

The latter statement implies that (a) events other than completion of prev
activity can be triggers and (b) entire processes, not just procedures can
be modeled in ADs.

Which one is it?

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