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

        :param composition_ids: list of compositions
        :type composition_ids: ``osid.id.IdList``
        :raise: ``NullArgument`` -- ``composition_ids`` is ``null``

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