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

        :param qualifier_ids: list of qualifiers
        :type qualifier_ids: ``osid.id.IdList``
        :raise: ``NullArgument`` -- ``qualifier_ids`` is ``null``

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