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diff --git a/lib/orber/src/orber_typedefs.erl b/lib/orber/src/orber_typedefs.erl
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+++ b/lib/orber/src/orber_typedefs.erl
@@ -0,0 +1,82 @@
+%%--------------------------------------------------------------------
+%%
+%% %CopyrightBegin%
+%% 
+%% Copyright Ericsson AB 1997-2009. All Rights Reserved.
+%% 
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%% 
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%% 
+%% %CopyrightEnd%
+%%
+%%
+%%-----------------------------------------------------------------
+%% File: orber_typedefs.erl
+%% Description:
+%%    This file contains some functions for internal typedef checking
+%%
+%%-----------------------------------------------------------------
+-module(orber_typedefs).
+
+-include("orber_iiop.hrl").
+-include_lib("orber/include/corba.hrl").
+
+%%-----------------------------------------------------------------
+%% External exports
+%%-----------------------------------------------------------------
+-export([get_op_def/2]).
+
+%%-----------------------------------------------------------------
+%% Internal exports
+%%-----------------------------------------------------------------
+-export([]).
+
+-define(DEBUG_LEVEL, 5).
+
+%%-----------------------------------------------------------------
+%% External interface functions
+%%-----------------------------------------------------------------
+%%-----------------------------------------------------------------
+%% Func: get_op_def/2
+%%
+get_op_def(_Objkey, '_is_a') ->
+    {orber_tc:boolean(),[orber_tc:string(0)],[]};
+%% First the OMG specified this operation to be '_not_existent' and then
+%% changed it to '_non_existent' without suggesting that both must be supported.
+%% See CORBA2.3.1 page 15-34, Minor revision 2.3.1: October 1999
+get_op_def(_Objkey, '_not_existent') ->
+    {orber_tc:boolean(),[],[]};
+get_op_def(_Objkey, '_non_existent') ->
+    {orber_tc:boolean(),[],[]};
+%% Defined in the Fault Tolerant section of the CORBA specification.
+get_op_def(_Objkey, '_FT_HB') ->
+    {orber_tc:void(),[],[]};
+get_op_def(Objkey, Op) ->
+    case catch iop_ior:get_key(Objkey) of
+	{_Local, _Key, _, _, Module} ->
+	    case catch Module:oe_tc(Op) of
+		{'EXIT', What} ->
+		    orber:dbg("[~p] orber_typedefs:get_op_def(~p);~n"
+			      "The call-back module does not exist or incorrect~n"
+			      "IC-version used. Reason:~n~p", 
+			      [?LINE, Module, What], ?DEBUG_LEVEL),
+		    corba:raise(#'TRANSIENT'{minor=(?ORBER_VMCID bor 7),
+					     completion_status=?COMPLETED_NO});
+		undefined ->
+		    corba:raise(#'BAD_OPERATION'{minor = (?ORBER_VMCID bor 4),
+						 completion_status=?COMPLETED_NO});
+		TC ->
+		    TC
+	    end;
+	_ ->
+	    corba:raise(#'INV_OBJREF'{completion_status=?COMPLETED_NO})
+    end.
+