code: public NotificationChain basicSetAlternatives(AbstractElement newAlternatives, NotificationChain msgs) {
  		AbstractElement oldAlternatives = alternatives;
  		alternatives = newAlternatives;
  		if (eNotificationRequired()) {
  			ENotificationImpl notification = new ENotificationImpl(this, Notification.SET, XtextPackage.ABSTRACT_RULE__ALTERNATIVES, oldAlternatives, newAlternatives);
  			if (msgs == null) msgs = notification; else msgs.add(notification);
  		}
  		return msgs;
  	}
docs: <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated