Added comment to make binary operator more clear.

    throw  IException(IException::User, msg, _FILEINFO_);

  }

  // If isMosaic is true, targetGroup will reference the Mosaic group.

  // Else, targetGroup will reference the Instrument group.

  PvlGroup &targetGroup = isMosaic ? label->findObject("IsisCube").findGroup("Mosaic")

                                   : label->findObject("IsisCube").findGroup("Instrument");

  // Add the ProductId keyword for translation. If a product id is not specified

  // by the user, set it to the Observation Id.

  // This is added before the translation instead of adding it to the exported xml

  // because of the ease of editing pvl vs xml.

  PvlGroup &targetGroup = isMosaic ? label->findObject("IsisCube").findGroup("Mosaic")

                                   : label->findObject("IsisCube").findGroup("Instrument");

  PvlKeyword productId = PvlKeyword("ProductId");

  if ( ui.WasEntered("PRODUCTID") ) {

    productId.setValue( ui.GetString("PRODUCTID") );