Required waiting period. Whenever any application or petition presented under Section XXVIII has been finally acted upon by the board of aldermen under the provisions of this ordinance and the decision of the board of aldermen has been adverse to the applicant, said board of aldermen shall not, for a period of six months from the date of its decision, receive or entertain, nor shall it refer to the planning and zoning board consideration, an identical or similar application seeking the same or similar relief as prayed for in the application first denied.