code: def NewFd(self, fd, URL, encoding, options):
          
          ret = libxml2mod.xmlReaderNewFd(self._o, fd, URL, encoding, options)
          return ret
docs: Setup an xmltextReader to parse an XML from a file
            descriptor. NOTE that the file descriptor will not be
            closed when the reader is closed or reset. The parsing
            flags @options are a combination of xmlParserOption. This
             reuses the existing @reader xmlTextReader.