anchor.diff:  	    {error, Ls}
       end;
   validate({wallaby_group, _}=Group, Commit) ->
  -    error_logger:warning_msg("validating ~p for commit~p~n", [Group, Commit]),
  +    ?D_LOG("validating ~p for commit~p~n", [Group, Commit]),
       BadFeatures = {nonexistent_features, {array, [F || F <- wallaby_group:features(Group), wallaroo:get_entity(F, feature, Commit) =:= none]}},
       BadParameters = {nonexistent_parameters, {array, [P || {P, _} <- wallaby_group:parameters(Group), wallaroo:get_entity(P, parameter, Commit) =:= none]}},
       case [Fail || Fail={_, Ls} <- [BadFeatures, BadParameters], Ls =/= {array, []}] of
  
positive.code: 
  %%% XXX: this doesn't do proactive graph validation yet -- but it could (and should)
  validate({wallaby_group, _}=Group, none) ->
      error_logger:warning_msg("validating ~p for no commit~n", [Group]),
      Features = {nonexistent_features, wallaby_group:features(Group)},
      Parameters = {nonexistent_parameters, [P || {P, _} <- wallaby_group:parameters(Group)]},
      case [Fail || Fail={_, Ls} <- [Features, Parameters], Ls =/= []] of
  
negative.code: -export([allowed_methods/2, content_types_provided/2, content_types_accepted/2, finish_request/2]).
  
  -include_lib("webmachine/include/webmachine.hrl").
  -include("dlog.hrl").
  
  init(Args) ->
      wallaroo_web_common:generic_init(Args).
  