@abc.abstractmethod<EOL><INDENT>def get_assignable_configuration_ids(self, configuration_id):<DEDENT>
return<EOL>
Gets a list of configurations including and under the given configuration node in which any parameter can be
        assigned.

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

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