The ID of the property assignment or method call that caused the change.
AppearanceOnly
A Boolean value.
If True, then the property changed affects only the display of the feature(s), not the interpretation of their contents.
FeatureAffected
A Long value.
The feature index of the feature affected by the property assignment or -1 if more than one or all features are affected. The value may be -1 for some assignments even if the McFeatures object only holds one feature.