anchor.diff:      {false, Req, State}.
   
   allowed_methods(Req, State) ->
  -    {['GET', 'POST', 'HEAD'], Req, State}.
  +    {['GET', 'POST', 'DELETE', 'HEAD'], Req, State}.
   
   resource_exists(Req, State = #state{mode = collection}) ->
       {true, Req, State};
  
positive.code: 
  content_types_provided(Req, State) ->
      {[{"application/json", to_json}], Req, State}.
  
  to_json(Req, State = #state{mode = collection}) ->
      Context = State#state.context,
  
negative.code:         , malformed_request/2
          , allowed_methods/2
          , resource_exists/2
          , delete_resource/2
          , content_types_provided/2
          , to_json/2
          , process_post/2
  