Schema for the WMO Community Core Metadata Profile. Based on XML Schema and ISO 19115 Implementation of Annex B.3.1 Extent 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 EX_Extent Lines 335-338 Added by ET-IDM-4. Eventually this should be a list of coordinate types and references, but at present it is left as a free string with a default EX_GeographicExtent Lines 340-349: geographic area of the dataset EX_GeographicBoundingBox Lines 344-347 Note that W3CXMLSchema on its own cannot enforce correctness bewteen west < east or south < north Also west and east numeric domains are restricted to +/- 180. EX_TemporalExtent: time period covered by the dataset EX_VerticalExtent Lines 355-358 specifically the minimum must be less than or equal to the maximum value (although this caanot be enforced solely by W3CXMLSchema). Negative values reflect below the datum which can be the surface or MeanSeaLevel etc. Non meteorologists should note that the third geometric co-ordinate may not literally be a vertical co-ordinate, but can be a parametric measure. set of points to define a polygon Latitude and longitude value 349: geographic identifier extended to allow an attribute link to a gazetteer 342: set of points defining the bounding polygon ET-IDM-4 addition (set of) point(s) with no implied connectivity added by ETIDM: reference time of data This could be the creation date and time of a forecast with a different beginning and ending (Note this type is extended to allow different date or time types) added by ETIDM: start time of data (Note this type is extended to allow different date or time types) added by ETIDM: end time of data. If not present implies continuing/no end time (Note this type is extended to allow different date or time types) added by ETIDM: Temporal repetition of data (e.g. hourly etc) 355: lowest vertical extent 356: highest vertical extent 357: units of measure, e.g. metres, feet, hectopascal and type of vertical measure being used (e.g. height, geopotential, pressure or othewise) additional element to allow redefinition of the datum level for vertical measurements single point with latitude and longitude