code: protected function getItemUriFromRefId($itemId)
      {
          $ref = $this->getServiceManager()->get(CatService::SERVICE_ID)->getAssessmentItemRefByIdentifier(
              $this->getCompilationDirectory()['private'],
              $itemId
          );
          return explode('|', $ref->getHref())[0];
      }
docs: Get item uri associated to the given $itemId.
  
  @return string The uri