All principal uses of land or buildings permitted in the various zoning districts are listed in sections 11-6-2, 11-7-2, 11-8-2, and 11-9-2 of this title. For the purpose of functional classification, and to facilitate convenient reference, individual uses are grouped into categories whereby the uses are related by having similar functions, products, or performances which provide a basis for their systematic assignment to specific zoning districts in accordance with criteria directly relevant to the health, safety, and public welfare of the citizens of Ponca City. The use categories, which are further grouped into five (5) general land use classifications, are established by the criteria described in section 11-4-2 of this chapter. (Ord. 5916, 8-9-1999)