anchor.diff:  -spec is_subs(ReqData::term()) -> boolean().
   is_subs(ReqData) ->
   	case string:str(wrq:path(ReqData),"_subscribe") of
  -		0 ->
  -			false;
  -		_ ->
  -			true
  +		0 -> false;
  +		_ -> true
   	end.
   
   %% @doc
  
positive.code: -spec is_unsubs(ReqData::term()) -> boolean().
  is_unsubs(ReqData) ->
  	case string:str(wrq:path(ReqData),"_unsubscribe") of
  		0 ->
  			false;
  		_ ->
  			true
  	end.
  
  %% @doc
  
negative.code: -spec is_rank(ReqData::term()) -> boolean().
  is_rank(ReqData) ->
  	case string:str(wrq:path(ReqData),"_rank") of
  		0 -> false;
  		_ -> true
  	end.
  
  
  