public static function serializeDraft( eZUser $user )
    {
        return json_encode(
            array(
                 'login' => $user->attribute( 'login' ),
                 'password_hash' => $user->attribute( 'password_hash' ),
                 'email' => $user->attribute( 'email' ),
                 'password_hash_type' => $user->attribute( 'password_hash_type' )
            )
        );
    }