code: def other_seqids(self):
          
          seqids = self._xml_root.xpath('GBSeq_other-seqids/GBSeqid/text()')
          return {t: l.rstrip('|').split('|')
                  for t, _, l in [si.partition('|') for si in seqids]}
docs: returns a dictionary of sequence ids, like {'gi': ['319655736'], 'ref': ['NM_000551.3']}