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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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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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