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Either one of TimePointRelativeTarget or MethodOID must be present, and both must not be present at the same time.
If the value of TimePointRelativeTarget or the value returned by the method referenced by the MethodOID is a "zero time duration", the transition must be executed immediately, or within the provided time window, when provided.
Examples of "zero time duration" are "P0D", "PT0H", "PT0S".
The TimepointPreWindow attribute describes the amount of time, expressed as an ISO 8601 duration, to which the relative time between the two activities may be shortened with respect to the value in TimepointRelativeTarget or as delivered by the method referenced by MethodOID.
The TimepointPostWindow attribute describes the amount of time, expressed as an ISO 8601 duration, to which the relative time between the two activities may be elongated with respect to the value in TimepointRelativeTarget or as delivered by the method referenced by MethodOID.
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