Add key to this index which inherits its value set from the most specific super-class which is known.
Add key to this index which inherits its value set from the most specific super-class which is known.
Add value to all keys which are subclasses of the given key.
Add value to all keys which are subclasses of the given key. If the key is not known yet, it is inserted as if using addKey.
Remove value from all keys in the index.
Remove value from all keys in the index.
Remove value from all keys which are subclasses of the given key.
Remove value from all keys which are subclasses of the given key.