Add xlink XML namespace to all root elements

In order to convert <link xlink:href=""> for external links correctly,
the xlink XML namespace has to be declared explicitly.

guide/adoc/README.md

@@ -58,9 +58,6 @@ locations in the sources.
   This would break all links to the guide. As docbookrx does not take
   configuration parameters, this has to be changed in the visitor directly.
 
-* `<link xlink:href="...">`
-  This is not converted correctly. All external links are broken.
-
 * Missing distinction between `<programlisting><prompt></><userinput></></>`, `<screen>`, and `<programlisting>`
   They all result in similar [source] blocks at the moment. Based on how they
   are used in the guide, we should keep the semantics by adding style

guide/xml/glossary.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V5.0//EN"
 "http://docbook.org/xml/5.0/dtd/docbook.dtd">
-<chapter xml:id="guide-terms">
+<chapter xml:id="guide-terms" xmlns:xlink="http://www.w3.org/1999/xlink">
   <title>MacPorts Guide Glossary</title>
 
   <para>This section defines a number of words which may be new to

guide/xml/guide.xml

@@ -4,7 +4,7 @@
 <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V5.0//EN"
 "http://docbook.org/xml/5.0/dtd/docbook.dtd">
 
-<book>
+<book xmlns:xlink="http://www.w3.org/1999/xlink">
     <info>
         <title><application>MacPorts</application> Guide</title>
         <authorgroup>

guide/xml/installing.xml

@@ -5,7 +5,7 @@
 "http://docbook.org/xml/5.0/dtd/docbook.dtd"[
 <!ENTITY macports-version "2.4.3">
 ]>
-<chapter xml:id="installing">
+<chapter xml:id="installing" xmlns:xlink="http://www.w3.org/1999/xlink">
     <title>Installing MacPorts</title>
 
     <para>This chapter shows you how to install MacPorts and its prerequisites step-by-step. Note that the section about

guide/xml/internals-hier.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V5.0//EN"
 "http://docbook.org/xml/5.0/dtd/docbook.dtd">
-<refentry xml:id="porthier">
+<refentry xml:id="porthier" xmlns:xlink="http://www.w3.org/1999/xlink">
   <refmeta>
     <refentrytitle>PORTHIER</refentrytitle>
 

guide/xml/internals-tests.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V5.0//EN"
 "http://docbook.org/xml/5.0/dtd/docbook.dtd">
-<section xml:id="internals.tests">
+<section xml:id="internals.tests" xmlns:xlink="http://www.w3.org/1999/xlink">
     <title>Tests</title>
 
     <para>

guide/xml/internals.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V5.0//EN"
 "http://docbook.org/xml/5.0/dtd/docbook.dtd">
-<chapter xml:id="internals">
+<chapter xml:id="internals" xmlns:xlink="http://www.w3.org/1999/xlink">
   <title>MacPorts Internals</title>
 
   <para>This chapter contains information about the MacPorts file layout,

guide/xml/intro.xml

@@ -3,7 +3,7 @@
 -->
 <!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V5.0//EN"
 "http://docbook.org/xml/5.0/dtd/docbook.dtd">
-<chapter xml:id="introduction">
+<chapter xml:id="introduction" xmlns:xlink="http://www.w3.org/1999/xlink">
     <title>Introduction</title>
 
     <para>MacPorts is an easy to use system for compiling, installing, and managing open source software. MacPorts may

guide/xml/macports.conf.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V5.0//EN"
 "http://docbook.org/xml/5.0/dtd/docbook.dtd">
-<section xml:id="internals.configuration-files">
+<section xml:id="internals.configuration-files" xmlns:xlink="http://www.w3.org/1999/xlink">
   <title>Configuration Files</title>
 
   <para>The MacPorts configuration files often do not need to be modified for the

guide/xml/macros.xml

@@ -3,7 +3,7 @@
 "http://docbook.org/xml/5.0/dtd/docbook.dtd">
 
 <!-- This section will be hidden by a xsl:template in resources/base.xsl -->
-<chapter xml:id='macros'>
+<chapter xml:id='macros' xmlns:xlink="http://www.w3.org/1999/xlink">
 <title>Macros</title>
 
 <!-- Marks a section as outdated with a reason. -->

guide/xml/portfile-dependencies.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V5.0//EN"
 "http://docbook.org/xml/5.0/dtd/docbook.dtd">
-<section xml:id="reference.dependencies">
+<section xml:id="reference.dependencies" xmlns:xlink="http://www.w3.org/1999/xlink">
   <title>Dependencies</title>
 
   <para>Free and open source software is highly modular, and MacPorts ports

guide/xml/portfile-keywords.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V5.0//EN"
 "http://docbook.org/xml/5.0/dtd/docbook.dtd">
-<section xml:id="reference.keywords">
+<section xml:id="reference.keywords" xmlns:xlink="http://www.w3.org/1999/xlink">
   <title>Global Keywords</title>
 
   <para>MacPorts keywords are used to specify required or optional items

guide/xml/portfile-livecheck.xml

@@ -2,7 +2,7 @@
 <!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V5.0//EN"
 "http://docbook.org/xml/5.0/dtd/docbook.dtd">
 
-<section xml:id="reference.livecheck">
+<section xml:id="reference.livecheck" xmlns:xlink="http://www.w3.org/1999/xlink">
   <title>Livecheck / Distcheck</title>
 
   <para>Options livecheck and distcheck are especially useful for port

guide/xml/portfile-phase.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V5.0//EN"
 "http://docbook.org/xml/5.0/dtd/docbook.dtd">
-<section xml:id="reference.phases">
+<section xml:id="reference.phases" xmlns:xlink="http://www.w3.org/1999/xlink">
   <title>Port Phases</title>
 
   <section xml:id="reference.phases.introduction">

guide/xml/portfile-startupitem.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V5.0//EN"
 "http://docbook.org/xml/5.0/dtd/docbook.dtd">
-<section xml:id="reference.startupitems">
+<section xml:id="reference.startupitems" xmlns:xlink="http://www.w3.org/1999/xlink">
   <title>StartupItems</title>
 
   <para>A StartupItem is a MacPorts facility to run <quote>daemons,</quote> a Unix term for

guide/xml/portfile-tcl.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V5.0//EN"
 "http://docbook.org/xml/5.0/dtd/docbook.dtd">
-<section xml:id="reference.tcl-extensions">
+<section xml:id="reference.tcl-extensions" xmlns:xlink="http://www.w3.org/1999/xlink">
   <title>Tcl Extensions &amp; Useful Tcl Commands</title>
 
   <para>A MacPorts Portfile is a Tcl script, so it may contain any arbitrary

guide/xml/portfile-variables.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V5.0//EN"
 "http://docbook.org/xml/5.0/dtd/docbook.dtd">
-<section xml:id="reference.variables">
+<section xml:id="reference.variables" xmlns:xlink="http://www.w3.org/1999/xlink">
   <title>Global Variables</title>
 
   <para>Global variables are variables available to any Portfile. For a list

guide/xml/portfile-variants.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V5.0//EN"
 "http://docbook.org/xml/5.0/dtd/docbook.dtd">
-<section xml:id="reference.variants">
+<section xml:id="reference.variants" xmlns:xlink="http://www.w3.org/1999/xlink">
   <title>Variants</title>
 
   <para>MacPorts variants are conditional modifications of port installation

guide/xml/portfiledev.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V5.0//EN"
 "http://docbook.org/xml/5.0/dtd/docbook.dtd">
-<chapter xml:id="development">
+<chapter xml:id="development" xmlns:xlink="http://www.w3.org/1999/xlink">
   <title>Portfile Development</title>
 
   <para>A port is a distribution of software that can be compiled and

guide/xml/portfileref.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V5.0//EN"
 "http://docbook.org/xml/5.0/dtd/docbook.dtd">
-<chapter xml:id="reference">
+<chapter xml:id="reference" xmlns:xlink="http://www.w3.org/1999/xlink">
   <title>Portfile Reference</title>
 
   <para>This chapter serves as a reference for the major elements of a