private function sayDateLiteral(RdfWriter $writer, TimeValue $value)
{
$dateValue = $this->dateCleaner->getStandardValue($value);
if (!is_null($dateValue)) {
// XXX: type should perhaps depend on precision.
$writer->value($dateValue, 'xsd', 'dateTime');
} else {
$writer->value($value->getTime());
}
}