This keyword indicates that the interface should be accessible outside of it's module, but does not need all methods exported. It exports only the autogenerated methods required for Cast<>, etc... to work.
Blueprintable
Specifies that this interface can be directly implemented by blueprints, this is implied if the interface has any blueprint events.
NotBlueprintable
Specifies that this interface cannot be implemented by blueprints, equivalent to CannotImplementInterfaceInBlueprint metadata.
ConversionRoot
Sets IsConversionRoot metadata flag for this interface.