@abc.abstractmethod<EOL><INDENT>def set_avatar(self, asset_id):<DEDENT>
pass<EOL>
Sets the avatar asset.

        :param asset_id: an asset ``Id``
        :type asset_id: ``osid.id.Id``
        :raise: ``InvalidArgument`` -- ``asset_id`` is invalid
        :raise: ``NoAccess`` -- ``Metadata.isReadOnly()`` is ``true``

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