Is it possible to write the following statement using standard propel?

select distinct document.id, document.document_name,
document.document_description
from document
left join (document_tag
  left join tag on document_tag.tag_id = tag.id
) on document.id = document_tag.document_id

I tried something like this, on the DocumentPeer.class.php:

$c = new Criteria();
$c->setDistinct();
$c->addJoin(self::ID, DocumentTagPeer::DOCUMENT_ID,
Criteria::LEFT_JOIN);
$c->addJoin(DocumentTagPeer::TAG_ID, TagPeer::ID,
Criteria::LEFT_JOIN);
return self::doSelect($c);

The problem is that the 2nd join must be between document_tag and tag
tables.

Regards,
Radu.
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