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TN-Air: AerodromeNode - no bidirectional reference to AerodromeType and AerodromeCategory

In the current data model it is not possible to navigate to the aerodrome type or the aerodrome category when identifying an AerodromeNode. If one would like to know the aerodrome type or aerodrome category the whole dataset of the AerodromeType/AerodromeCategory has to be searched to find the reference to the desired AerodromeNode. A reference from the AerodromeNode to the AerodromeType/AerodromeCategory is currently not foreseen in the data model and is a major obstacle to use the INSPIRE TN-Air data. Other featuretypes in TN-Air might have the same issue. We kindly propose to think about that issue and preferable change the data model accordingly.