def METHOD_NAME(self):
    # Write the <futureMetadata> element.
    attributes = [
        ("name", "XLDAPR"),
        ("count", 1),
    ]
    self._xml_start_tag("futureMetadata", attributes)
    self._xml_start_tag("bk")
    self._xml_start_tag("extLst")
    # Write the ext element.
    self._write_ext()
    self._xml_end_tag("extLst")
    self._xml_end_tag("bk")
    self._xml_end_tag("futureMetadata")