The element <zoneRef> contains the zoning information (one or more), as described in Chap 3.4. For the use of the element <zoneRef> in connection with common information repositories, refer to Chap 4.13.1.This element is available in the product management data within the element <productionMaintData> of preliminary requirements (refer to Chap 3.9.5.2.1.9) and within the element <para> of descriptive data modules.