       "search"    -> %{}
       "related"   -> %{}
       "via"       -> %{}
+      nil         -> %{}
       "alternate" ->
         alternate_feed_map = %{UUID.uuid1() => %{title: attr[:title], url: attr[:href]}}
         %{feed: %{alternate_feeds: alternate_feed_map}}

    :"cfi:downloadurl", :"cfi:lastdownloadtime", :"cba:broadcast", :"aan:item_id", :"aan:segments",
    :"aan:cme", :keywords, :"itunes:link", :"podextra:humandate", :"podextra:player",
    :"cba:duration", :"cba:attachmentID", :"im:image", :"episode_mp3", :"jwplayer:talkId",
    :"aidsgov:transcript", :"foto_428", :"podcast:brandStory"
  ], do: %{}



        %{}
      "http://podlove.org/simple-chapters" ->
        %{}
      "replies" ->
        %{}
    end
  end

