protected function retrieveAndLoadData($revId = null)
{
$revision = $revId ? Revision::newFromId($revId) : null;
$contentParser = new ContentParser($this->title);
$parserOutput = $contentParser->setRevision($revision)->parse()->getOutput();
if ($parserOutput instanceof ParserOutput) {
return new ParserData($this->title, $parserOutput);
}
throw new UnexpectedValueException('ParserOutput is missing');
}
