code: public NotificationChain basicSetGuardCondition(Condition newGuardCondition, NotificationChain msgs) {
  		Condition oldGuardCondition = guardCondition;
  		guardCondition = newGuardCondition;
  		if (eNotificationRequired()) {
  			ENotificationImpl notification = new ENotificationImpl(this, Notification.SET, XtextPackage.GROUP__GUARD_CONDITION, oldGuardCondition, newGuardCondition);
  			if (msgs == null) msgs = notification; else msgs.add(notification);
  		}
  		return msgs;
  	}
docs: <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated