code: def dumps_etree(pid, record, **kwargs):
      
      from dojson.contrib.to_marc21 import to_marc21
      from dojson.contrib.to_marc21.utils import dumps_etree
  
      return dumps_etree(to_marc21.do(record['_source']), **kwargs)
docs: Dump MARC21 compatible record.
  
      :param pid: The :class:`invenio_pidstore.models.PersistentIdentifier`
          instance.
      :param record: The :class:`invenio_records.api.Record` instance.
      :returns: A LXML Element instance.