OMG Exam OMG-OCUP2-ADV300 Topic 5 Question 31 Discussion

In UML, a simple State can indeed be redefined, but the specifics of how it is redefined matter:

A is incorrect as redefinition of States, including simple States, is permitted.

B is correct. A simple State can be effectively removed or altered through redefinition in a derived StateMachine, which could include changing its type or characteristics.

C suggests that a simple State can be turned into a composite State. While theoretically possible in the context of redefinition, this option might be considered a significant alteration that could be misleading without additional context.

D is incorrect; UML does support State Redefinition.

UML Specification, particularly the sections on Redefinition and StateMachines.

Detailed rules on state redefinition are outlined in the UML 2.5 Documentation, specifically under StateMachine specializations.