* Proper DTD declaration

* Use of XInclude
* Fixed incorrect document version

src/docbook/module/appendix.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<chapter id="appendix">
+<!DOCTYPE appendix PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.docbook.org/xml/4.5/docbookx.dtd">
+<appendix id="appendix">
   <title>Additional Resources</title>
   <para>To be written...</para>
-</chapter>
+</appendix>

src/docbook/module/architecture.xml

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.docbook.org/xml/4.5/docbookx.dtd">
 <chapter id="architecture">
   <title>Architecture &amp; Road Map</title>
   <para>To be written...</para>

src/docbook/module/codec.xml

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.docbook.org/xml/4.5/docbookx.dtd">
 <chapter id="codec">
   <title>Encoders and Decoders</title>
   <para>To be written...</para>

src/docbook/module/introduction.xml

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.docbook.org/xml/4.5/docbookx.dtd">
 <chapter id="introduction">
   <title>Introduction</title>
   <para>To be written...</para>

src/docbook/module/preface.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE preface PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.docbook.org/xml/4.5/docbookx.dtd">
+<preface id="preface">
+  <title>Preface</title>
+  <para>To be written...</para>
+</preface>

src/docbook/module/security.xml

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.docbook.org/xml/4.5/docbookx.dtd">
 <chapter id="security">
   <title>Securing the Wire</title>
   <para>To be written...</para>

src/docbook/module/template.xml

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.docbook.org/xml/4.5/docbookx.dtd">
 <chapter id="chapter-id">
   <title>Chapter title</title>
   <para>To be written...</para>

src/docbook/module/threading.xml

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.docbook.org/xml/4.5/docbookx.dtd">
 <chapter id="threading">
   <title>Threading</title>
   <para>To be written...</para>

src/docbook/module/transport.xml

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.docbook.org/xml/4.5/docbookx.dtd">
 <chapter id="transport">
   <title>Transports</title>
   <para>To be written...</para>