This “HowTo” is a short guideline, what addon-designer should be consider, when they want to use the underlying navdata (default ones or from some other provider).
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You should try to split your scenery from the navdata. The reason for that is, that whenever something changed in the navdata, you must also update your scenery on-time not be outdated (and also your user must update his scenery file). To include terminal-waypoints, terminal-procedures, … is a more or less bad design and should be avoided. ASOBO/MS and we too, update the navdata all 28 days as in real-world.
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It is highly recommanded, to use the “DeleteAirport” element, even when the airport doesn´t exist in the default data. You can´t be sure, that someone else build the same airport and when you don´t include it, you see the “double scenery” effect (double runways, markings, lights, …).
To avoid this, add following in your airport project:
<DeleteAirport deleteAllApronLights="TRUE" deleteAllAprons="TRUE" deleteAllHelipads="TRUE" deleteAllRunways="TRUE" deleteAllStarts="TRUE" deleteAllTaxiways="TRUE" deleteAllBlastFences="TRUE" deleteAllJetways="TRUE" deleteAllControlTowers="TRUE" deleteAllPaintedElements="TRUE" deleteAllLightSupports="TRUE" deleteAllTaxiwaySigns="TRUE" />
With this statement, you can be sure, that your scenery (if it´s high enough in the scenery-hierarchy) overrule all other sceneries which are lower but your scenery uses the navdata which are installed (3rd party or the default data).