def get_composition_query(self):
raise errors.Unimplemented()<EOL>
Gets the query for a composition.

        Multiple queries can be retrieved for a nested ``OR`` term.

        return: (osid.repository.CompositionQuery) - the composition
                query
        raise:  Unimplemented - ``supports_composition_query()`` is
                ``false``
        *compliance: optional -- This method must be implemented if
        ``supports_composition_query()`` is ``true``.*