["< sod > there are relational [ [ classification classification rule ] ] s, relational [ [ decision tree learning | linear regression tree ] ], < eod > < sod > there are relational [ [ classification rule ] ] s ('''of relational classification'''), relational [ [ decision tree learning | object regression analysis tree ] ], and finally relational [ [ association rule ] ] s <! - -... minor weasel words should follow but left here as a prompt in case some one can add actual node information :, and so on - - >. < eod >"]