if (this.callback.onObligation(parent, expression, ob) == CallbackResult.STOP) { return CallbackResult.STOP;
if (this.callback.onObligation(parent, expression, ob) == CallbackResult.STOP) { return CallbackResult.STOP;
if (this.callback.onObligation(parent, expression, ob) == CallbackResult.STOP) { return CallbackResult.STOP;
if (this.callback.onObligation(parent, expression, ob) == CallbackResult.STOP) { return CallbackResult.STOP;