anchor.diff:  
   [source,clojure]
   ----
  -(th/find-first result :tag :item)
  +(th/find-first result {:tag :item})
   
   ;; => [:item {} [[:title {} ["Hello world"]]]]
   ----
   
   [source,clojure]
   ----
  -(th/find-first result :path [:rss :channel :description])
  +(th/find-first result {:path [:rss :channel :description]})
   
   ;; => [:description {} ["This is an example of an RSS feed"]]
   ----
  
positive.code: 
  [source,clojure]
  ----
  (th/find-first result :attribute :isPermaLink)
  
  ;; => [:guid {:isPermaLink "false"} ["7bd204c6-1655-4c27-aeee-53f933c5395f"]]
  ----
  
negative.code: 
  [source,clojure]
  ----
  (th/find-first result {:attribute [:isPermaLink true]})
  
  ;; => [:guid {:isPermaLink "true"} ["7bd204c6-1655-4c27-aeee-53f933c5395f"]]
  ----
  