code: def _oai_to_xml(marc_oai):  # TODO: move this to MARC XML parser?
      
      record = MARCXMLRecord(marc_oai)
      record.oai_marc = False
  
      return record.to_XML()
docs: Convert OAI to MARC XML.
  
      Args:
          marc_oai (str): String with either OAI or MARC XML.
  
      Returns:
          str: String with MARC XML.