code: def try_sort_fmt_opts(rdf_format_opts_list, uri):
      filename, file_extension = os.path.splitext(uri)
      if file_extension == ".ttl" or file_extension == ".turtle":
          return ['turtle', 'n3', 'nt', 'json-ld', 'rdfa', 'xml']
      elif file_extension == ".xml" or file_extension == ".rdf":
          return ['xml', 'turtle', 'n3', 'nt', 'json-ld', 'rdfa']
      elif file_extension == ".nt" or file_extension == ".n3":
          return ['n3', 'nt', 'turtle', 'xml', 'json-ld', 'rdfa']
      elif file_extension == ".json" or file_extension == ".jsonld":
          return [
              'json-ld',
              'rdfa',
              'n3',
              'nt',
              'turtle',
              'xml',
          ]
      elif file_extension == ".rdfa":
          return [
              'rdfa',
              'json-ld',
              'n3',
              'nt',
              'turtle',
              'xml',
          ]
      else:
          return rdf_format_opts_list