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

        ``BankReceiver.changedChildOfBanks()`` is invoked when the
        specified node or any of its descendants experiences a change in
        its children.

        :param bank_id: the ``Id`` of the ``Bank`` node to monitor
        :type bank_id: ``osid.id.Id``
        :raise: ``NullArgument`` -- ``bank_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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