. . . . "aggregates" . "This relation is not visible in the rfc4287 xml. It is not clear that it is needed either, though it can help simplify queries. See also N3 rule that defines this precisely " . . "The feed aggregates this given Entry. See \u00A74.1.1 of rfc4287. This means that the entry does not have the feed as its source. The entry was taken from a different feed." .