public function visit(Visitor $visitor, Generator $generator, $data)
{
parent::visit($visitor, $generator, $data->relation);
$visitor->setHeader('Location', $this->router->generate('ezpublish_rest_loadVersionRelation', array('contentId' => $data->relation->contentId, 'versionNumber' => $data->relation->versionNo, 'relationId' => $data->relation->relation->id)));
$visitor->setStatus(201);
}