anchor.diff:  Example:
     api.php?action=login&lgname=user&lgpassword=password ")
   
  -
   (define-proxy list-category-members
       :core ((action query)
               (list categorymembers))
  
positive.code:     alist keys are: :title :ns :pageid
  "
      )
  
  
  #| Some experimenting indicates that, at least for queries
  where ((action query) (prop revisions) (rvprop content)), the
  
negative.code:                   (list firstresults secondresults)))
  ")
  
  (define-proxy recent-changes
      :core ((action query)
             (list recentchanges))
  