anchor.diff:  %% JSON-RPC entry point
   %% CAlled by local exo http server
   handle_rpc("authorize_local_message", Args) ->
  -    {ok, Target} = rvi_common:get_json_element(["target"], Args),
  +    {ok, ServiceName} = rvi_common:get_json_element(["service_name"], Args),
       {ok, CallingService} = rvi_common:get_json_element(["calling_service"], Args),
  -    authorize_local_message(Target, CallingService);
  +    authorize_local_message(ServiceName, CallingService);
   
   handle_rpc("authorize_remote_message", Args) ->
  -    {ok, Target} = rvi_common:get_json_element(["target"], Args),
  +    {ok, ServiceName} = rvi_common:get_json_element(["service_name"], Args),
       {ok, Signature} = rvi_common:get_json_element(["signature"], Args),
       {ok, Certificate} = rvi_common:get_json_element(["certificate"], Args),
  -    authorize_remote_message(Target, Signature, Certificate);
  +    authorize_remote_message(ServiceName , Signature, Certificate);
   
   handle_rpc(Other, _Args) ->
  -    ?debug("    authorize_rpc:handle_rpc(~p): unknown~n", [ Other ]),
  +    ?debug("authorize_rpc:handle_rpc(~p): unknown", [ Other ]),
       { ok, [ { status, rvi_common:json_rpc_status(invalid_command)} ] }.
  
positive.code:      ]
      }.
  
  authorize_local_message(Target, CallingService) ->
      ?debug("    authorize_rpc:authorize_local_msg(): target: ~p ~n", [Target]),
      ?debug("    authorize_rpc:authorize_local_msg(): calling_service: ~p ~n", [CallingService]),
      {ok, 
       [ 
         { status, rvi_common:json_rpc_status(ok)},
         { signature, "fixme_add_signature" },
  %%       { certificate, get_certificate_body(CallingService, Target) }
         { certificate, "certificate"  }
       ]}.
  
  authorize_remote_message(Target, Signature, Certificate) ->
      ?debug("    authorize_rpc:authorize_remote_msg(): target: ~p ~n", [Target]),
      ?debug("    authorize_rpc:authorize_remote_msg(): signature: ~p ~n", [Signature]),
      ?debug("    authorize_rpc:authorize_remote_msg(): certificate: ~p ~n", [Certificate]),
      {ok, 
       [ 
         { status, rvi_common:json_rpc_status(ok) },
  
negative.code: %% Retrieve certificate. 
  %% Certificate will be passed to exo_json:encode() in order
  %% to be translated to JSON.
  get_certificate_body(_CallingService, _ServiceName) ->
      {struct, 
       [
        %% Topic tree patterns that this node is authorized to
  