“Stall spaces” are: inside market buildings; protected from the elements by roofs over the market buildings; and designated and identified on plats of the several markets kept up to date by the Mayor or his authorized agent. City Code, 1966, art. 16, §1(a) 1976/83, art. 16, §1(a) Ord. 56-421 Ord. 75-783 Ord. 83-1074