The words "itinerant vendor" and/or "transient merchant" shall be construed to mean and include all persons, both principal and agent, who engage in a temporary and transient business in the city selling goods, wares or merchandise from a location on the public streets or on a vacant lot or in a storeroom, store building or structure where such goods, wares or merchandise are on display for a period of not more than ninety (90) days or a place where temporary desk room is used and/or any temporary expedient is resorted to for temporary purposes as distinguished from a continuing or permanent business in the city. (Prior code § 2346)