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* callback to draw a single layer element (aircraft, waypoint, navaid, runway) | * callback to draw a single layer element (aircraft, waypoint, navaid, runway) | ||
* A new class (Nasal hash) that derives from the "Layer" class and implements its interface | * A new class (Nasal hash) that derives from the "Layer" class and implements its interface | ||
* A "data source" ( | * A "data source" (provider) hash that provides the data to be rendered (i.e. populates the model) | ||