code: def __process_url_wrapper_elements(self, elements):
          
          urls = ''
          for url_wrapper, articles in elements:
              urls += self.__create_url_node_for_content(
                  url_wrapper,
                  'others',
                  url=urljoin(self.url_site, url_wrapper.url),
                  modification_time=self.__get_date_key(sorted(articles, key=self.__get_date_key, reverse=True)[0])
              )
          return urls
docs: Creates the url nodes for pelican.urlwrappers.Category and pelican.urlwrappers.Tag.
          :param elements: list of wrapper elements
          :type elements: list
          :return: the processes urls as HTML
          :rtype: str