TR+ denotes a time range ?tr2 whose length is longer that ?tr1 by a duration ?duration.
(<=> (Tr+ ?Tr1 ?Duration ?Tr2)
(And (= (Time-Range.Start-Time ?Tr1)
(Time-Range.Start-Time ?Tr2))
(= (Tp+ (Time-Range.End-Time ?Tr1) ?Duration)
(Time-Range.End-Time ?Tr2))))