the expression “restricted development provision” means a provision contained under this Part of this Act in a planning scheme in relation to any specified land in the area to which such planning scheme relates that the development of such land wholly or mainly by the erection of buildings of one or more specified classes shall be restricted; the word “development” when used without qualification means the development of land wholly or mainly by the erection of buildings of the class or of any one or more of the classes specified in the relevant restricted development provision.
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