code: private String getDefaultSortOrderXml() throws IOException {
          CheckedSupplier<InputStream, IOException> createStreamFunc = () -> {
              if (customSortOrderFile != null) {
                  UrlWrapper urlWrapper = new UrlWrapper(customSortOrderFile);
                  if (urlWrapper.isUrl()) {
                      return urlWrapper.openStream();
                  } else {
                      return openCustomSortOrderFile();
                  }
              } else if (predefinedSortOrder != null) {
                  return getPredefinedSortOrder(predefinedSortOrder);
              }
              return getPredefinedSortOrder(DEFAULT_SORT_ORDER_FILENAME);
          };
  
          try (InputStream inputStream = createStreamFunc.get()) {
              return IOUtils.toString(inputStream, encoding);
          }
      }
docs: Retrieves the default sort order for sortpom
  
  @return Content of the default sort order file