@abc.abstractmethod<EOL><INDENT>def search_among_locations(self, location_ids):<DEDENT>
pass<EOL>
Execute this search among the given list of locations.

        :param location_ids: list of locations
        :type location_ids: ``osid.id.IdList``
        :raise: ``NullArgument`` -- ``location_ids`` is ``null``

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