interval started by https://www.commoncoreontologies.org/TimeOntology A Temporal Interval INT2 is started by some Temporal Interval INT1 iff there exist Temporal Instants inst1, inst2, and inst3 such that inst1 is the starting instant of both INT1 and INT2, inst2 is the ending instant of INT1, inst3 is the ending instant of INT2 and inst2 is before inst3. 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 interval starts interval contains one-dimensional temporal region