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

        :param installation_ids: list of installations
        :type installation_ids: ``osid.id.IdList``
        :raise: ``NullArgument`` -- ``installation_ids`` is ``null``

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