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diff --git a/lib/docbuilder/src/docb_xml_check.erl b/lib/docbuilder/src/docb_xml_check.erl
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+++ b/lib/docbuilder/src/docb_xml_check.erl
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+%% ``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 via the world wide web at http://www.erlang.org/.
+%% 
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either expressed or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%% 
+%% The Initial Developer of the Original Code is Ericsson Utvecklings AB.
+%% Portions created by Ericsson are Copyright 1999-2000, Ericsson 
+%% Utvecklings AB. All Rights Reserved.''
+%% 
+%%     $Id$
+%%
+-module(docb_xml_check).
+
+-export([validate/1]).
+
+%% validate(File) -> ok | error | {error, badfile}
+%%   File = string(), file name with or without ".xml" extension
+%% If XML validation fails for a file, the error information from
+%% Xmerl is printed to terminal and the function returns error.
+validate(File0) ->
+    File = case filename:extension(File0) of
+	       ".xml" -> File0;
+	       _ -> File0++".xml"
+	   end,
+    case filelib:is_regular(File) of
+	true ->
+	    DtdDir = docb_util:dtd_dir(),
+	    case catch xmerl_scan:file(File, [{validation,true},
+					      {fetch_path,[DtdDir]}]) of
+		{'EXIT', Error} ->
+		    io:format("~p~n", [Error]),
+		    error;
+		{_Doc, _Misc} ->
+		    ok
+	    end;
+	false ->
+	    {error, badfile}
+    end.