interval disjoint interval is before https://www.commoncoreontologies.org/TimeOntology A TemporalInterval INT1 is before some TemporalInterval INT2 iff there exists TemporalInstants inst1, inst2 such that inst1 is the ending instant of INT1 and inst2 is the starting instant of INT2 and inst1 is before inst2. J. F. Allen and J. A. G. M. Koomen. Planning using a temporal world model. In Proceedings of the 8th International Joint Conference on Artificial Intelligence (IJCAI-1983) pages 741–747. Available at: https://www.ijcai.org/Proceedings/83-2/Papers/036.pdf one-dimensional temporal region