Backport of:
commit 1273639b93dea51af1b0dd39651bf15c3bbff2d9
Author: Federico Mena Quintero <federico@gnome.org>
Date:   Fri Jan 25 11:21:11 2019 -0600

    Try to make Docbook 5 really work...

diff --git a/doc/rsvg-docs.xml b/doc/rsvg-docs.xml
index 12b50518..d744e2e0 100644
--- a/doc/rsvg-docs.xml
+++ b/doc/rsvg-docs.xml
@@ -1,12 +1,10 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<!DOCTYPE book
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML 5.0//EN"
+               "http://www.oasis-open.org/docbook/xml/5.0"
 [
   <!ENTITY version SYSTEM "version.xml">
 ]>
-<book xmlns="http://docbook.org/ns/docbook"
-      xmlns:xi="http://www.w3.org/2001/XInclude"
-      xmlns:xlink="http://www.w3.org/1999/xlink"
-      version="5.1">
+<book xmlns:xi="http://www.w3.org/2001/XInclude">
   <!--
     Copyright © 2009, 2010 Christian Persch
     Copyright © 2017 Federico Mena Quintero
@@ -24,7 +22,7 @@
       For librsvg version &version;
 
       The latest version of this documentation can be found on-line at the
-      <link xlink:href="http://library.gnome.org/devel/rsvg/index.html" role="online-location">GNOME Library</link>.
+      <link href="http://library.gnome.org/devel/rsvg/index.html" role="online-location">GNOME Library</link>.
     </releaseinfo>
 
     <copyright>
@@ -57,7 +55,7 @@
 
         You may obtain a copy of the <citetitle>GNU General Public Licence</citetitle>
         from the Free Software Foundation at
-        <link xlink:href="http://www.gnu.org/licences/">GNU Licences web site</link>
+        <link href="http://www.gnu.org/licences/">GNU Licences web site</link>
         or by writing to:
 
         <address>
@@ -70,16 +68,14 @@
     </legalnotice>
   </info>
 
-  <part xml:id="rsvg">
+  <part id="rsvg">
     <title>API Reference</title>
     <partintro>
       <para>
         Librsvg is a library for rendering Scalable Vector Graphics 1.1
-        files (<link
-        xlink:href="https://www.w3.org/TR/SVG/">SVG 1.1</link>).
+        files (<link href="https://www.w3.org/TR/SVG/">SVG 1.1</link>).
         Specifically, it can take non-animated, non-scripted SVG data
-        and render it into a <link
-        xlink:href="https://www.cairographics.org/">Cairo</link>
+        and render it into a <link href="https://www.cairographics.org/">Cairo</link>
         surface.  Normally this means an in-memory raster surface, but
         it could also be any of the other surface types that Cairo
         supports.
@@ -87,7 +83,7 @@
 
       <para>
 	Librsvg supports many of the graphic features in the <link
-	xlink:href="https://www.w3.org/TR/SVG/">SVG 1.1
+	href="https://www.w3.org/TR/SVG/">SVG 1.1
 	specification</link>.  The main features of SVG 1.1 that
 	librsvg does not support are the following:
       </para>
@@ -192,7 +188,7 @@
     <para>
       You may obtain a copy of the <citetitle>GNU General Public Licence</citetitle>
       from the Free Software Foundation at
-      <link xlink:href="http://www.gnu.org/licences/">GNU Licences web site</link>
+      <link href="http://www.gnu.org/licences/">GNU Licences web site</link>
       or by writing to:
 
       <address>
--- librsvg-2.44.14/librsvg/rsvg-handle.c.orig	2019-02-15 19:20:24.000000000 +0100
+++ librsvg-2.44.14/librsvg/rsvg-handle.c	2019-06-09 17:05:18.357977812 +0200
@@ -31,7 +31,7 @@
  * or in the most general form, from a #GInputStream that will provide SVG data.
  *
  * Librsvg supports reading <link
- * xlink:href="https://www.w3.org/TR/SVG/">SVG 1.1</link> data.  It also
+ * href="https://www.w3.org/TR/SVG/">SVG 1.1</link> data.  It also
  * supports SVGZ files, which is just an SVG stream compressed with the GZIP
  * algorithm.
  *
@@ -43,7 +43,7 @@
  * and that it has an image element like this:
  *
  * |[
- * <image xlink:href="resources/foo.png" .../>
+ * <image href="resources/foo.png" .../>
  * ]|
  *
  * In this case, librsvg needs to know the location of the toplevel