anchor.diff:  
   %% @doc Fetch a RDF resource
   rsc(Uri, Context) ->
  +    ?DEBUG(Uri),
       z_depcache:memo(
           fun() ->
  -            z_notifier:foldl(#rdf_get{uri = Uri}, #rdf_resource{}, Context)
  +            ?DEBUG(z_notifier:foldl(#rdf_get{uri = Uri}, #rdf_resource{}, Context))
           end,
           #rdf_resource{id = Uri},
           ?WEEK,
  
positive.code: 
  % Assume integer input is a RscId
  m_find_value(RscId, #m{value = undefined} = M, Context) when is_integer(RscId) ->
      case m_rsc:p_no_acl(RscId, uri, Context) of
          undefined -> undefined;
          Uri -> m_find_value(Uri, M, Context)
      end;
  
  % Assume other input is an Uri we need to lookup
  m_find_value(Uri, #m{value = undefined} = M, Context) ->
      M#m{value = rsc(Uri, Context)};
  
  
negative.code: m_to_list(_, _Context) ->
      [].
  
  m_value(#m{}, Context) ->
      undefined.
  
  %% @doc Fetch an object from a RDF resource
  object(Url, Predicate, Context) ->
  