@abc.abstractmethod<EOL><INDENT>def get_assignable_bank_ids(self, bank_id):<DEDENT>
return<EOL>
Gets a list of banks including and under the given banks node in which any assessment taken can be assigned.

        :param bank_id: the ``Id`` of the ``Bank``
        :type bank_id: ``osid.id.Id``
        :return: list of assignable bank ``Ids``
        :rtype: ``osid.id.IdList``
        :raise: ``NullArgument`` -- ``bank_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request

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