@abc.abstractmethod<EOL><INDENT>def set_composition(self, composition_id):<DEDENT>
pass<EOL>
Sets the composition.

        :param composition_id: a composition
        :type composition_id: ``osid.id.Id``
        :raise: ``InvalidArgument`` -- ``composition_id`` is invalid
        :raise: ``NoAccess`` -- ``Metadata.isReadOnly()`` is ``true``
        :raise: ``NullArgument`` -- ``composition_id`` is ``null``

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