code: private function createRequest(LocatorRequest $locatorRequest, $requestOption)
      {
          $xml = new DOMDocument();
          $xml->formatOutput = true;
  
          $trackRequest = $xml->appendChild($xml->createElement('LocatorRequest'));
          $trackRequest->setAttribute('xml:lang', 'en-US');
  
          $request = $trackRequest->appendChild($xml->createElement('Request'));
  
          $node = $xml->importNode($this->createTransactionNode(), true);
          $request->appendChild($node);
  
          $request->appendChild($xml->createElement('RequestAction', 'Locator'));
          $request->appendChild($xml->createElement('RequestOption', $requestOption));
  
          // Origin Address
          $trackRequest->appendChild($locatorRequest->getOriginAddress()->toNode($xml));
  
          // Translate
          $trackRequest->appendChild($locatorRequest->getTranslate()->toNode($xml));
  
          // Unit of measurement
          if ($locatorRequest->getUnitOfMeasurement()) {
              $trackRequest->appendChild($locatorRequest->getUnitOfMeasurement()->toNode($xml));
          }
  
          // LocationSearchCriteria
          if ($locatorRequest->getLocationSearchCriteria()) {
              $trackRequest->appendChild($locatorRequest->getLocationSearchCriteria()->toNode($xml));
          }
  
          return $xml->saveXML();
      }
docs: Create the TimeInTransit request.
  
  @param LocatorRequest $locatorRequest The request details. Refer to the UPS documentation for available structure
  @param integer $requestOption
  
  @return string