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The TargetTransition references a transition that is the target of a branching.
The ConditionOID references a ConditionDef element defining a condition that needs to be evaluated at the time of entering the branching state. As such, the condition must be considered as "blocking
An example may be that the target of the transition may only be executed when a lab result for a specific lab test has been received. Then, until the lab result was not received, the start of the target is "put on hold". For transitions that can must be reevaluated executed after some time or are evaluated continously ("wait until ..."), i.e. that are "non-blocking", use TransitionTimingConstrainta specfic given time, use TransitionTimingConstraint. An example may be: next test must be done after 10 minutes.