anchor.diff:  
   
   delete(#state{i_mixin=false}=State, #occi_node{type=capabilities}) ->
  -                                                % TODO: handle this in occi_store: do not query backend in case it does not support and return sthig like 403
  +    % TODO: handle this in occi_store: do not query backend in case it does not support and return sthig like 403
       {ok, State};
   
   delete(#state{proxy=Backend}=State, #occi_node{type=capabilities, data=Mixin}=Node) ->
  
positive.code: 
  
  update(#state{i_mixin=false}=State, #occi_node{type=capabilities}) ->
                                                  % TODO: handle this in occi_store: do not query backend in case it does not support and return sthig like 403
      {ok, State};
  
  update(#state{proxy=Backend}=State, #occi_node{type=capabilities, data=Mixin}=Node) ->
  
negative.code:     ?info("[~p] find(~p)~n", [?MODULE, Node]),
      case occi_node:type(Node) of
          capabilities ->
  			find_user_mixins(State, Node);
          occi_collection ->
              find_bounded(State, Node);
          _ ->
  