Schema for the WMO Community Core Metadata Profile. Based on XML Schema and ISO 19115 Implementation of Annex B.2.5 Maintenance Information Version 0.2 Defined by Expert Team on Integrated Data Management Second Meeting 13-16 May 2002 Shinfield England Third Meeting 15-18 December 2003 Geneva Fourth Meeting 1-3 September 2004 Geneva MD_Maintenance Lines 143-148: scope and frequency of updating 143: frequency allowing choice of MD_MaintenanceFrequencyCodeList, or WMO code list or date, time or dateTime 148: information regarding specific requirements