docs: private static void speedUpDTMManager() throws Exception {
          // https://github.com/aws/aws-sdk-java/issues/238
          // http://stackoverflow.com/questions/6340802/java-xpath-apache-jaxp-implementation-performance
          if (System.getProperty(DTM_MANAGER_DEFAULT_PROP_NAME) == null) {
              Class<?> XPathContextClass = Class.forName(XPATH_CONTEXT_CLASS_NAME);
              Method getDTMManager = XPathContextClass.getMethod("getDTMManager");
              Object XPathContext = XPathContextClass.newInstance();
              Object dtmManager = getDTMManager.invoke(XPathContext);
  
              if (DTM_MANAGER_IMPL_CLASS_NAME.equals(dtmManager.getClass().getName())) {
                  // This would avoid the file system to be accessed every time
                  // the internal XPathContext is instantiated.
                  System.setProperty(DTM_MANAGER_DEFAULT_PROP_NAME,
                          DTM_MANAGER_IMPL_CLASS_NAME);
              }
          }
      }