From 6edb73b7ead578d7b909a30da71dcd4fd9935c47 Mon Sep 17 00:00:00 2001
From: Alain Reguera Delgado <alain.reguera@gmail.com>
Date: Sep 12 2012 18:03:42 +0000
Subject: Update `Gpl/gpl.docbook' file.


---

diff --git a/Documentation/Models/Gpl/gpl.docbook b/Documentation/Models/Gpl/gpl.docbook
index fe1c604..50d371b 100644
--- a/Documentation/Models/Gpl/gpl.docbook
+++ b/Documentation/Models/Gpl/gpl.docbook
@@ -1,3 +1,8 @@
+<?xml version="1.0"?>
+<!DOCTYPE appendix PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
+    "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd"
+    []>
+
 <appendix id="licenses-gpl">
 
     <title>GNU General Public License</title>