anchor.diff:              case dbus_proxy:call(Backend, ?IFACE_BACKEND, <<"Find">>, [occi_uri:to_binary(Id)]) of
                   {ok, []} ->
                       {{ok, []}, State};
  -                {ok, [{?N_ENTITY, #dbus_variant{value=OpaqueId}, Owner, Serial}]} ->
  +                {ok, [{?N_ENTITY, OpaqueId, Owner, Serial}]} ->
                       Res = #occi_node{id=Id, objid=OpaqueId, owner=Owner, etag=Serial, type=occi_entity},
                       {{ok, [Res]}, State};
                   {ok, [{?N_UNBOUNDED, _, _, _}]} ->
  
positive.code: 
  list_bounded(#state{proxy=Backend}=State, Node, Opts) ->
      Cid = occi_node:objid(Node),
  	Filters = [],
      case dbus_proxy:call(Backend, ?IFACE_BACKEND, <<"List">>, [occi_cid:to_binary(Cid), Filters]) of
          {ok, {ColId, Serial}} ->
              ?debug("Set collection id: ~p", [ColId]),
              Res = #occi_node{id=occi_node:id(Node), objid=ColId, etag=Serial, type=occi_collection, 
  							 data=occi_collection:new(Cid)},
              next(State, Res, Opts);
          {error, Err} ->
              {{error, Err}, State}
  
negative.code: 
  find_unbounded(#state{proxy=Backend}=State, Node) ->
      Id = occi_node:objid(Node),
      Filters = [],
      case dbus_proxy:call(Backend, ?IFACE_BACKEND, <<"List">>, [occi_uri:to_binary(Id), Filters]) of
          {ok, {ColId, Serial}} ->
              ?debug("Set collection id: ~p", [ColId]),
  