A relation between entities, expressing a 'sequence' schema. E.g. 'year 1999 precedes 2000', 'deciding what coffee to use' precedes 'preparing coffee', 'World War II follows World War I', 'in the Milan to Rome autoroute, Bologna precedes Florence', etc. It can then be used between tasks, processes, time intervals, spatially locate objects, situations, etc. Subproperties can be defined in order to distinguish the different uses.