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

        :param depot_ids: list of depots
        :type depot_ids: ``osid.id.IdList``
        :raise: ``NullArgument`` -- ``depot_ids`` is ``null``

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