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

        Multiple retrievals produce a nested ``OR`` term.

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