Future development zones' may only be determined as a consecutive zoning under § 12 section 4 or in the case of rezonings, ruled in § 23 sec. 2 lit. a, Code of Spatial Planning of Vorarlberg. Land, that is not suitable as building zones, must not be zoned in future development zones. Future development zones can be subdivided into core-, residential-, mixed- or operating areas. Category II operating areas are areas, which are primarily destined for operating facilites, that must not be be errected in category I operating areas. In category II operating areas must not be built a) appartments, with the exception of operationally necessary appartments for the supervisory- and maintenance staff, if they are integrated into the business, b) buildings and facilities for sports or leisure purposes c) buildings and facilities for the purpose of trade, provided that the trade does not take place exclusively for the resale of non-basic goods or subordinately in production plants for the sale of goods of predominantly own production.