an Entity references as follows:
The domestic association football season in countries that association football is played around the world varies in length and time of year contested. Most employ a single period in which the main league competition is contested alongside any cup competitions, although many Latin American leagues have two competitions contested in one season under the Apertura and Clausura system. In many leagues, the dates of the domestic season dictate the opening and closing of a transfer window, the periods when players can be transferred.