| http://www.w3.org/ns/prov#value | - The train moves in only one direction - clockwise or counter-clockwise - but a traveler who gets on the train at 6 o'clock and gets off at 12 can be said to have travelled north, whereas a traveler making the opposite journey will have traveled south.I agree, by the way, that non-instantaneous entry and exit from the box is a problem, and should cause some sort of malfunction or paradox.
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