public function link(\Twig_Environment $twig, $document, $title = null, array $attrs = array())
{
if (!$document instanceof Document) {
$document = $this->getDocumentWithPath($twig, $document);
}
$parameters = array('document' => $document, 'title' => $title ?: $document->getTitle(), 'attrs' => $attrs);
return $this->renderBlock($twig, 'document_link', $parameters);
}