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Using AIXM, it is possible to indicate a reason, such as ‘not applicable’, ‘unknown’, etc. for each property (attribute or association) that has no assigned value in the Data Set. This is done by assigning a suitable value to the nilReason attribute. A distinction is made between properties that are identified as "mandatory" for a data set in the PANS-AIM and other properties. For the mandatory properties, a nilReason is considered also mandatory, in order to explain why the value is not provided.
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When no value is assigned, a nilReason value shall be assigned to each attribute or association that is identified as ‘mandatory’ in the Data Set Coding Rules.
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When no value is assigned, a nilReason value should be assigned to each attribute or association that is identified as ‘recommended’ in the Data Set Coding Rules.
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The AIXM XML Schema allows a nilReason attribute to be used even when an element has a value. This could lead to confusions. Therefore, a additional rules of technical nature is specified.
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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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