In cases where a Transition terminates on a history Pseudostate when the State has not been entered before (i.e., no prior history) or it had reached its FinalState, there is an option to force a transition to a specific substate, using the default ...

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Pseudostates - deepHistory and shallowHistory
Source
Unified Modeling Language 2.5.1
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
Snippet kind
INFO
UML keywords
State
StateMachine
Vertex
Pseudostate
history
PseudostateKind::deepHistory
PseudostateKind::shallowHistory
default history mechanism
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In cases where a Transition terminates on a history Pseudostate when the State has not been entered before (i.e., no prior history) or it had reached its FinalState, there is an option to force a transition to a specific substate, using the default history mechanism.
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This is a Transition that originates in the history Pseudostate and terminates on a specific Vertex (the default history state) of the Region containing the history Pseudostate. This Transition is only taken if execution leads to the history Pseudostate a
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Two types of history Pseudostates are provided.
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This is a Transition that originates in the history Pseudostate and terminates on a specific Vertex (the default history state) of the Region containing the history Pseudostate. This Transition is only taken if execution leads to the history Pseudostate a
Otherwise, the appropriate history entry into the Region is executed (see above). If no default history Transition is defined, then standard default entry of the Region is performed ....
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