aviation 1 Example IWXXM Messages Examples examples 2019-09-09T14:07:45.489Z iwxxm-extensions 2019-09-05T14:57:30.802Z 2 IWXXM Extensions Extension schemas for use with IWXXM. 2019-09-09T12:57:42.587Z 1 UK Colour States UK Military Aerodrome Colour States for Observations and Measurements used for Met Office Aviation. Aviation 2019-09-09T14:07:45.492Z 2019-07-19T10:08:31.856Z Observations organised into Categories, based on observable quantity kinds and values. 14 Categorised Observations categorisedObservations 11 Published vocabularies for use in Aviation Data