def set_composition(self, composition_id=None):
pass<EOL>
Sets the composition.

        arg:    composition_id (osid.id.Id): a composition
        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.*