Upgrade reference docs to DocBook 5

For compatibility with Gradle docbook-reference-plugin, which cannot
handle DocBook 4.

src/reference/docbook/aop-api.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<chapter id="aop-api">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="aop-api">
   <title>Spring AOP APIs</title>
 
   <section id="aop-api-introduction">

src/reference/docbook/aop.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
- "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-
-<chapter id="aop">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="aop">
   <title>Aspect Oriented Programming with Spring</title>
 
   <section id="aop-introduction">

src/reference/docbook/beans-annotation-config.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<section id="beans-annotation-config">
+<section xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="beans-annotation-config">
   <title>Annotation-based container configuration</title>
 
   <sidebar>

src/reference/docbook/beans-classpath-scanning.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<section id="beans-classpath-scanning">
+<section xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="beans-classpath-scanning">
   <title>Classpath scanning and managed components</title>
 
   <para>Most examples in this chapter use XML to specify the configuration

src/reference/docbook/beans-context-additional.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<section id="context-introduction">
+<section xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="context-introduction">
   <title>Additional Capabilities of the
     <interfacename>ApplicationContext</interfacename></title>
 

src/reference/docbook/beans-customizing.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<section id="beans-factory-nature">
+<section xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="beans-factory-nature">
   <title>Customizing the nature of a bean</title>
 
   <section id="beans-factory-lifecycle">

src/reference/docbook/beans-dependencies.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<section id="beans-dependencies">
+<section xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="beans-dependencies">
   <title>Dependencies</title>
 
   <para>A typical enterprise application does not consist of a single object (or

src/reference/docbook/beans-extension-points.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<section id="beans-factory-extension">
+<section xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="beans-factory-extension">
   <title>Container Extension Points</title>
 
   <para>Typically, an application developer does not need to subclass

src/reference/docbook/beans-java.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<section id="beans-java">
+<section xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="beans-java">
   <title>Java-based container configuration</title>
 
   <section id="beans-java-basic-concepts">

src/reference/docbook/beans-scopes.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<section id="beans-factory-scopes">
+<section xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="beans-factory-scopes">
   <title>Bean scopes</title>
 
   <para>When you create a bean definition, you create a

src/reference/docbook/beans-standard-annotations.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<section id="beans-standard-annotations">
+<section xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="beans-standard-annotations">
   <title>Using JSR 330 Standard Annotations</title>
   
   <para>Starting with Spring 3.0, Spring offers support for JSR-330 standard annotations (Dependency Injection).

src/reference/docbook/beans.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<chapter id="beans">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="beans">
   <title>The IoC container</title>
 
   <section id="beans-introduction">

src/reference/docbook/cache.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
- "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-
-<chapter id="cache">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="cache">
 	<title>Cache Abstraction</title>
 
 	<section id="cache-introduction">

src/reference/docbook/cci.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<chapter id="cci">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="cci">
   <title>JCA CCI</title>
 
   <section id="cci-introduction">

src/reference/docbook/classic-aop-spring.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE appendix PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<appendix id="classic-aop-spring">
+<appendix xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="classic-aop-spring">
   <title>Classic Spring AOP Usage</title>
 
   <para>In this appendix we discuss 

src/reference/docbook/classic-spring.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE appendix PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<appendix id="classic-spring">
+<appendix xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="classic-spring">
   <title>Classic Spring Usage</title>
 
   <para>This appendix discusses some classic Spring usage patterns as a

src/reference/docbook/dao.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<chapter id="dao">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="dao">
   <title>DAO support</title>
 
   <section id="dao-introduction">

src/reference/docbook/dtd.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE appendix PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
- "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-
-<appendix id="springbeansdtd">
+<appendix xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="springbeansdtd">
   <title><literal>spring-beans-2.0.dtd</literal></title>
 
   <para><programlisting language="xml">&lt;!--

src/reference/docbook/dynamic-languages.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
- "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-
-<chapter id="dynamic-language">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="dynamic-language">
   <title>Dynamic language support</title>
 
   <section id="dynamic-language-introduction">

src/reference/docbook/ejb.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
- "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-
-<chapter id="ejb">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="ejb">
 	<title>Enterprise JavaBeans (EJB) integration</title>
 
 	<section id="ejb-introduction">

src/reference/docbook/expressions.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<chapter id="expressions">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="expressions">
   <title>Spring Expression Language (SpEL)</title>
 
   <section id="expressions-intro">

src/reference/docbook/index.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<book>
+<book xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xml:id="spring-framework-reference"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xmlns:xlink="http://www.w3.org/1999/xlink">
   <bookinfo>
     <title>Reference Documentation</title>
 

src/reference/docbook/jdbc.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<chapter id="jdbc">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="jdbc">
   <title>Data access with JDBC</title>
 
   <section id="jdbc-introduction">

src/reference/docbook/jms.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<chapter id="jms">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="jms">
   <title>JMS (Java Message Service)</title>
 
   <section id="jms-introduction">

src/reference/docbook/jmx.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
- "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-
-<chapter id="jmx">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="jmx">
   <title>JMX</title>
 
   <section id="jmx-introduction">

src/reference/docbook/mail.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
- "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-
-<chapter id="mail">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="mail">
   <title>Email</title>
 
   <section id="mail-introduction">

src/reference/docbook/mvc.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<chapter id="mvc">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="mvc">
   <title>Web MVC framework</title>
 
   <section id="mvc-introduction">

src/reference/docbook/new-in-3.0.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<chapter id="new-in-3.0">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="new-in-3.0">
   <title>New Features and Enhancements in Spring 3.0</title>
 
   <para>If you have been using the Spring Framework for some time, you will be

src/reference/docbook/new-in-3.1.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<chapter id="new-in-3.1">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="new-in-3.1">
   <title>New Features and Enhancements in Spring 3.1</title>
 
   <para>Building on the support introduced in Spring 3.0, Spring 3.1 is

src/reference/docbook/orm.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<chapter id="orm">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="orm">
   <title>Object Relational Mapping (ORM) Data Access</title>
 
   <section id="orm-introduction">

src/reference/docbook/overview.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<chapter id="overview">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="overview">
   <title>Introduction to Spring Framework</title>
 
   <para>Spring Framework is a Java platform that provides comprehensive

src/reference/docbook/oxm.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
- "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-
-<chapter id="oxm">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="oxm">
     <title>Marshalling XML using O/X Mappers</title>
 
     <section id="oxm-introduction">

src/reference/docbook/portlet.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
- "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-
-<chapter id="portlet" xmlns:xi="http://www.w3.org/2001/XInclude">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="portlet">
   <title>Portlet MVC Framework</title>
 
   <section id="portlet-introduction">

src/reference/docbook/preface.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE preface PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
- "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-
-<preface id="preface">
+<preface xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="preface">
   <title>Preface</title>
 
   <para>Developing software applications is hard enough even with good tools

src/reference/docbook/remoting.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<chapter id="remoting">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="remoting">
   <title>Remoting and web services using Spring</title>
 
   <section id="remoting-introduction">

src/reference/docbook/resources.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
- "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-
-<chapter id="resources">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="resources">
   <title>Resources</title>
 
   <section id="resources-introduction">

src/reference/docbook/scheduling.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<chapter id="scheduling">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="scheduling">
   <title>Task Execution and Scheduling</title>
 
   <section id="scheduling-introduction">

src/reference/docbook/spring-form.tld.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE appendix PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
- "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-
-<appendix id="spring-form.tld">
+<appendix xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="spring-form.tld">
    <title>spring-form.tld</title>
    <section id="spring-form.tld-intro">
       <title>Introduction</title>

src/reference/docbook/spring.tld.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE appendix PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
- "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-
-<appendix id="spring.tld">
+<appendix xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="spring.tld">
    <title>spring.tld</title>
    <section id="spring.tld-intro">
       <title>Introduction</title>

src/reference/docbook/swf-sidebar.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE sidebar PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
- "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-
-<sidebar>
+<sidebar xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="spring-web-flow-sidebar">
   <title>Spring Web Flow</title>
 
   <para>Spring Web Flow (SWF) aims to be the best solution for the management

src/reference/docbook/testing.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<chapter id="testing">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="testing">
   <title>Testing</title>
 
   <section id="testing-introduction">

src/reference/docbook/transaction.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<chapter id="transaction">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="transaction">
   <title>Transaction Management</title>
 
   <section id="transaction-intro">

src/reference/docbook/validation.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
- "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-
-<chapter id="validation">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="validation">
   <title>Validation, Data Binding, and Type Conversion</title>
 
   <section id="validation-introduction">

src/reference/docbook/view.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<chapter id="view">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="view">
   <title>View technologies</title>
 
   <section id="view-introduction">

src/reference/docbook/web-integration.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-<chapter id="web-integration">
+<chapter xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="web-integration">
   <title>Integrating with other web frameworks</title>
 
   <section id="intro">

src/reference/docbook/xml-custom.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE appendix PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
- "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-
-<appendix id="extensible-xml">
+<appendix xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="extensible-xml">
     <title>Extensible XML authoring</title>
     <section id="extensible-xml-introduction">
         <title>Introduction</title>

src/reference/docbook/xsd-configuration.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE appendix PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
- "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-
-<appendix id="xsd-config">
+<appendix xmlns="http://docbook.org/ns/docbook" version="5.0"
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:xi="http://www.w3.org/2001/XInclude"
+    xml:id="xsd-config">
     <title>XML Schema-based configuration</title>
     <section id="xsd-config-introduction">
         <title>Introduction</title>