Supporting material for ICAO Aerodrome Mapping Data Sets
v1.0.6
ED-99/DO-272 states that if "a particular attribute is "null," "unknown," "not entered," or "not applicable", it shall be listed as such". AIXM 5.1.1 makes use of GML's nilReason codelist in order to capture such details.
These values can be mapped as follows:
ED-99/DO-272 | AIXM 5.1.1 |
---|---|
null | Note: AIXM allows empty attributes |
unknown | unknown |
not entered | missing |
not applicable | inapplicable |
ED-119/DO-291 goes on to provide the exact encoding of the default values to be used in an AMDB.
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