code: def warn_if_element_not_of_class(element, class_suffix, special_ui_components_prefix):
      
      valid_class_names = ["%s%s" % (DEFAULT_UI_COMPONENTS_PREFIX, class_suffix)]
      if special_ui_components_prefix is not None:
          valid_class_names.append("%s%s" % (special_ui_components_prefix, class_suffix))
  
      if (not element.hasAttribute('customClass')) or element.attributes['customClass'].value not in valid_class_names:
          logging.warn("WARNING: %s is internationalized but isn't one of %s",
                       extract_element_internationalized_comment(element), valid_class_names)
docs: Log a warning if the element is not of the given type (indicating that it is not internationalized).
  
      Args:
          element: The xib's XML element.
          class_name: The type the element should be, but is missing.
          special_ui_components_prefix: If provided, will not warn about class with this prefix (default is only 'JT')