nl_tokens: Adds error messages to a given attribute and sends becameInvalid event to the record .
pl_tokens: function ( <mask> , messages ) { var wasEmpty = get ( this , 'isEmpty' ) ; messages = this . _findOrCreateMessages ( attribute , messages ) ; get ( this , 'content' ) . addObjects ( messages ) ; this . notifyPropertyChange ( attribute ) ; this . enumerableContentDidChange ( ) ; if ( wasEmpty && ! get ( this , 'isEmpty' ) ) { this . trigger ( 'becameInvalid' ) ; } }