UML Diagrams Zicomi Systems publishes some UML example diagrams online from the world famous UML dictionary. more...
Version 2.5 Released Zicomi Systems is delighted to announce that version 2.5 of Zicomi Mentor is released. With support for UML 2.0 and all thirteen UML diagrams more...
Zicomi Systems' Director speaks about the UML at Objects by Design - an informative interview more...
Partner Programme Zicom Systems is delighted to announce a new world wide partner programme, become a partner today. more...
OMG Member Zicom Systems is made a member of the OMG!
Deep History
A deep history is a kind of pseudostate that acts as a marker or placeholder. It represents the most recent active substate of the containing composite state, and the substates of that substate. It is not a state itself but a diagrammatic representation or marker for the "condition" of the composite state down to any level, at the time it was last exited.
Explanation
A deep history is like the shallow history with the added behavior that it can remember to any level of nesting of the composite states.
Important Points
A deep history acts as a placeholder down to any level of nested substates without restriction.
A deep history has got a deep "memory". The marker can recall the state of every nested substate of the enclosing substate, down to any level of nesting.
A shallow history is related to a deep history in the sense that it is has the same fundamental meaning except that it is more limited. While a deep history represents the condition of a composite state when it was last exited down to any level of nesting, a shallow history only 'remembers' the state of the composite state in which it is enclosed.
