docs: private static void speedUpDcoumentBuilderFactory() {
          if (System.getProperty(DOCUMENT_BUILDER_FACTORY_PROP_NAME) == null) {
              DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
              if (DOCUMENT_BUILDER_FACTORY_IMPL_CLASS_NAME.equals(factory.getClass().getName())) {
                  // This would avoid the file system to be accessed every time
                  // the internal DocumentBuilderFactory is instantiated.
                  System.setProperty(DOCUMENT_BUILDER_FACTORY_PROP_NAME,
                          DOCUMENT_BUILDER_FACTORY_IMPL_CLASS_NAME);
              }
          }
      }