docs: public NotificationChain basicSetExtends(JvmParameterizedTypeReference newExtends, NotificationChain msgs)
  	{
  		JvmParameterizedTypeReference oldExtends = extends_;
  		extends_ = newExtends;
  		if (eNotificationRequired())
  		{
  			ENotificationImpl notification = new ENotificationImpl(this, Notification.SET, SarlPackage.SARL_ARTIFACT__EXTENDS, oldExtends, newExtends);
  			if (msgs == null) msgs = notification; else msgs.add(notification);
  		}
  		return msgs;
  	}