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They are agreed and published by a particular community of interest. There may be multiple versions of an exchange model e.g. IWXXM 1.1 was used by the SESAR programme but a v2.1 is now available and v3 is open for testing.
The examples above relate to three ICAO business domains. However, other exchange models exist.
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- Aeronautical Information Exchange Model (AIXM)
- EUROCAE ED-252 - this contains a chapter defining the information. It also includes a AIRM conformance statement.
- Flight Information Exchange Model (FIXM)
- Aerodrome Mapping Exchange Model (AMXM)
- ICAO Meteorological Information Exchange ModeModel (IXWWM)