code: def _clean_for_xml(data):
      
  
      # If data is None or an empty string, don't bother
      if data:
          # This turns a string like "Hello…" into "Hello&#8230;"
          data = data.encode("ascii", "xmlcharrefreplace").decode("ascii")
          # However it's still possible that there are invalid characters in the string,
          # so simply remove any of those characters
          return _illegal_xml_chars_re.sub("", data)
      return data
docs: Sanitize any user-submitted data to ensure that it can be used in XML