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+<?xml version="1.0" encoding="latin1" ?>
+<!DOCTYPE chapter SYSTEM "chapter.dtd">
+
+<chapter>
+  <header>
+    <copyright>
+      <year>1998</year><year>2009</year>
+      <holder>Ericsson AB. All Rights Reserved.</holder>
+    </copyright>
+    <legalnotice>
+      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.
+    
+    </legalnotice>
+
+    <title>Using the Plain Erlang Back-end</title>
+    <prepared></prepared>
+    <docno></docno>
+    <date>98-05-06</date>
+    <rev>B</rev>
+    <file>ch_erl_plain.xml</file>
+  </header>
+
+  <section>
+    <title>Introduction</title>
+    <p>The mapping of OMG IDL to the Erlang programming language when
+      Plain Erlang 
+      is the back-end of choice is similar to the one used in pure Erlang IDL
+      mapping. The only difference is on the generated code and the extended
+      use of pragmas for code generation: IDL functions are translated
+      to Erlang
+      module function calls.</p>
+  </section>
+
+  <section>
+    <title>Compiling the Code</title>
+    <p>In the Erlang shell type :</p>
+    <p>ic:gen(<c><![CDATA[<filename>, [{be, erl_plain}])]]></c>.</p>
+  </section>
+
+  <section>
+    <title>Writing the Implementation File</title>
+    <p>For each IDL interface <c><![CDATA[<interface name>]]></c> defined in the IDL file:</p>
+    <list type="bulleted">
+      <item>Create the corresponding Erlang file that will hold the
+       Erlang implementation of the IDL definitions.  </item>
+      <item>Call the implementation file after the scope of the IDL interface, 
+       followed by the suffix <c>_impl</c>.</item>
+      <item>Export the implementation functions.</item>
+    </list>
+    <p>For each function defined in the IDL interface :</p>
+    <list type="bulleted">
+      <item>Implement an Erlang function that uses as arguments in the same
+       order, as the input arguments described in the IDL file, and returns 
+       the value described in the interface.</item>
+      <item>When using the function, follow the mapping described in chapter 2.</item>
+    </list>
+  </section>
+
+  <section>
+    <title>An Example</title>
+    <p>      <marker id="plain_idl"></marker>
+
+      In this example, a file "random.idl" is generates code for the plain Erlang
+      back-end :</p>
+    <list type="bulleted">
+      <item>
+        <p>Main file : "plain.idl"</p>
+        <code type="none">
+\011   
+module rmod {
+ 
+  interface random {
+ 
+    double produce();
+ 
+    oneway void init(in long seed1, in long seed2, in long seed3);
+ 
+  };
+ 
+};
+        </code>
+      </item>
+    </list>
+    <p>Compile the file :</p>
+    <code type="none">
+      Erlang (BEAM) emulator version 4.9
+      
+      Eshell V4.9  (abort with ^G)
+      1> ic:gen(random,[{be, erl_plain}]).
+      Erlang IDL compiler version 2.5.1
+      ok
+      2> 
+    </code>
+    <p></p>
+    <p>When the file "random.idl" is compiled it produces five files: two for 
+      the top scope, two for the interface scope, and one for the module
+      scope. The header files for top scope and interface
+      are empty and not shown here. In this case only the file for the interface 
+      <c>rmod_random.erl</c> is important :. 
+            <marker id="generated files"></marker>
+</p>
+    <list type="bulleted">
+      <item>
+        <p>Erlang file for interface : "rmod_random.erl"</p>
+        <code type="none">
+
+-module(rmod_random).
+ 
+ 
+ 
+%% Interface functions
+-export([produce/0, init/3]).
+ 
+%%------------------------------------------------------------
+%% Operation: produce
+%% 
+%%   Returns: RetVal
+%%
+produce() ->
+    rmod_random_impl:produce().
+ 
+%%------------------------------------------------------------
+%% Operation: init
+%% 
+%%   Returns: RetVal
+%%
+init(Seed1, Seed2, Seed3) ->
+    rmod_random_impl:init(Seed1, Seed2, Seed3).
+        </code>
+      </item>
+    </list>
+    <p>The implementation file should be called <c>rmod_random_impl.erl</c> 
+      and could look like this:</p>
+    <code type="none">
+      -module('rmod_random_impl').
+      
+      -export([produce/0,init/3]).
+      
+      
+      produce()  ->
+        random:uniform().
+       
+      
+      init(S1,S2,S3)  ->
+        random:seed(S1,S2,S3).
+    </code>
+    <p>Compiling the code : </p>
+    <code type="none">
+2> make:all().
+Recompile: rmod_random
+Recompile: oe_random
+Recompile: rmod_random_impl
+up_to_date
+    </code>
+    <p></p>
+    <p>Running the example : </p>
+    <code type="none">
+3>  rmod_random:init(1,2,3).
+ok
+4>  rmod_random:produce().  
+1.97963e-4
+5> 
+    </code>
+  </section>
+</chapter>
+