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- Dashed arrowed line between objects enclosing substates. The Event signatures of the transitions in the two objects must match
- Dashed line from transitions between states of an object to the box enclosing its sub-states with corresponding event signatures.
- Sub-states may be or-substates (disjoint) or and-substates (concurrent)
- History indicator will allow resumption of activities held in its memory.
Ananda Amatya
11/3/1999