@Tom
How does TaskInstance.getAvailableTransitions() differ from 
Token.getAvailableTransitions()? If I remember correctly, if the task instance 
is allowed to signal, then its transitions correspond exactly to those of the 
token. Otherwise, none is available. Broadly speaking, would that be the 
behavior of TaskInstance.getAvailableTransitions(), or am I missing something?

@Michael
I imagine the 12-hr window corresponds to a desperate user that is shocked to 
find there's nothing he can do, which still feels like a badly designed process 
to me. I agree that there might be situations where this is unavoidable, tough. 

This leads to the conclusion that a deadlocked process is undistinguishable 
from a temporarily stalled one, under the light of a pessimistic analysis. 
Well, we still have unit tests. 

@Ronald
Is what you modeled a sort of state in-between nodes, similar to a place 
(sometimes confusingly referred to as condition) in a Petri net?

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