returns a dictionary of sequence ids, like {'gi': ['319655736'], 'ref': ['NM_000551.3']}

def other_seqids(self):
        """returns a dictionary of sequence ids, like {'gi': ['319655736'], 'ref': ['NM_000551.3']}"""
        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]}