code: def translate_identifier(self, identifier, target_namespaces=None, translate_ncbi_namespace=None):
          
          namespace, alias = identifier.split(nsa_sep) if nsa_sep in identifier else (None, identifier)
          aliases = self.translate_alias(alias=alias,
                                         namespace=namespace,
                                         target_namespaces=target_namespaces,
                                         translate_ncbi_namespace=translate_ncbi_namespace)
          return [nsa_sep.join((a["namespace"], a["alias"])) for a in aliases]
docs: Given a string identifier, return a list of aliases (as
          identifiers) that refer to the same sequence.