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The following values shall be used for the nilReason attribute: - inapplicable - there is no value. It is normal that a value is not assigned because the corresponding real world artifact does not have this kind of property);
- unknown - the correct value is not known to, and not computable by, the sender of this data;
- withheld - the value is not divulged. A value exists, but it cannot be provided because it is subject to restricted use (for example, it is a military restricted data, it is commercially sensitive, etc.). Access to this data might be possible through direct contact with the data provider, in special circumstances.
- other:NOTAM - the value is not provided as part of the BASELINE. A value is allocated and provided through NOTAM, when operationally necessary;
other:invalidValueCopiedAsNote - the actual value is in a Note because it does not fit in the constraints for the element type in the current AIXM version. Typically, this is used when the original data comes from a future AIXM version, which is backwards mapped.
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Note: the list of values for the nilReason attribute, inherited from the Geographical Markup Language (GML) Schema, also contains two values ("missing" and "template") for which no operational usage was identified in relation with aeronautical data. Therefore, these shall not be used in digital AIS data sets.
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The following values shall not be used for the nilReason attribute: - missing - the correct value is not readily available to the sender of this data. Furthermore, a correct value may not exist
- template - the value will be available later
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