@abc.abstractmethod<EOL><INDENT>def register_for_changed_bank_hierarchy(self):<DEDENT>
pass<EOL>
Registers for notification of an updated bank hierarchy structure.

        ``BankReceiver.changedChildOfBanks()`` is invoked when a node
        experiences a change in its children.

        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*