It is a petty misdemeanor for any person to possess, keep, or allow to be kept within the area of any City park, beverage containers made partially or entirely of glass, or any other material which is breakable and results in sharp or potentially harmful pieces when broken. This section shall apply to bringing any such beverage containers into a City park, the use of such a beverage container within the City park, or the actual or constructive possession of such a beverage container within a City park. Notice shall be posted once each year in one location in each City park. (1988 Code § 10.53)