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Shallow history (shallowHistory) represents a return to only the topmost substate of the most recent state configuration, which is entered using the default entry rule.

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SysMLv1: Cameo Simulation Toolkit: StateMachine shallowHistory Pseudostate [with mini video]
Source
Unified Modeling Language 2.5.1
Copyright information
About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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INFO
UML keywords
State
StateMachine
Vertex
Pseudostate
history
PseudostateKind::shallowHistory
substate
default entry rule
state configuration
Full quote
Shallow history (shallowHistory) represents a return to only the topmost substate of the most recent state configuration, which is entered using the default entry rule.
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Two types of history Pseudostates are provided.
shallowHistory – ... this type of Pseudostate is a kind of variable that represents the most recent active substate of its containing Region, but not the substates of that substate. A Transition terminating on this Pseudostate implies rest
shallowHistory – ... A single outgoing Transition from this Pseudostate may be defined terminating on a substate of the composite State. This substate is the default shallow history state of the composite State.
shallowHistory Pseudostate can only be defined for composite States and, at most one such Pseudostate can be included in a Region of a composite State.
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