VOICP — Variability in notation

Allow usage of activity diagrams as alternative to state machine
when not available

After section 9.2 Stereotypes of the UML Voice Profile, add a section: "Using Activity diagrams to represent dialog behavior" with the following content.

For more flexibility in the implementation, the dialog behavior which, from a semantic point of view is defined by a state machine, can however be rendered by an activity diagram following some conventions.

When this variation in notation is used the following mappings should apply:

• An ActivityGraph replaces a StateMachine.
• A InitialNode replaces a Pseudostate with kind=initial
• A DecisionNode replaces a Pseudostate with kind=choice
• A MergeNode replaces a Pseudostate with kind=junction
• An ActivityFinalNode replaces a FinalState
• An Action replaces a State

The base classes for the stereotypes are changed according to these mappings.