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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.