+ "commented" => ["post-thread", "commented"],
+ "private" => ["post", "private"],
+ "visible" => ["post", "visible"],
+ "deleted" => ["post", "deleted"],
+ "thr-parent-id" => ["post", "thr-parent-id"],
+ "author-id" => ["post", "author-id"],
+ "gravity" => ["post", "gravity"],