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The EndConditionOID references a ConditionDef defining the condition under which the transition can be completed. As long as the condition is not met, the transition to the next actitivity or event must be considered to be temporary blocked. When the target structural element can be considered to be a "visit", the condition can be regarded as a visit entry criterion.
When the execution of the transition is depending on a timing constraint that is either directly defined or calculated, a TransitionTimingConstraint must be defibed and referencing the current Transition.