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Two types of history Pseudostates are provided.

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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
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INFO
UML keywords
State
StateMachine
Vertex
Pseudostate
history
PseudostateKind::deepHistory
PseudostateKind::shallowHistory
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Two types of history Pseudostates are provided.
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Deep history (deepHistory) represents the full state configuration of the most recent visit to the containing Region.
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deepHistory – This type of Pseudostate is a kind of variable that represents the most recent active state configuration of its owning Region. ... a Transition terminating on this Pseudostate implies restoring the Region to that same state ...
deepHistory – ... The entry Behaviors of all States in the restored state configuration are performed in the appropriate order starting with the outermost State
A deepHistory Pseudostate can only be defined for composite States and, at most one such Pseudostate can be contained in a Region of a composite State.
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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Deep history (deepHistory) represents the full state configuration of the most recent visit to the containing Region.
The effect is the same as if the Transition terminating on the deepHistory Pseudostate had, instead, terminated on the innermost State of the preserved state configuration, including execution of all entry Behaviors encountered along the way.
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.
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 ...
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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