--- /dev/null
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+ "http://docbook.org/xml/4.5/docbookx.dtd">
+<book id="mission-chan">
+ <bookinfo>
+ <title>Adventure of Mission-chan</title>
+ </bookinfo>
+
+ <chapter id="mission-chan-1">
+ <title>ミッションちゃんの大冒険</title>
+
+ <para>Lorem ipsum...</para>
+ </chapter>
+
+</book>
\ No newline at end of file
--- /dev/null
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE set PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+ "http://docbook.org/xml/4.5/docbookx.dtd">
+<set>
+ <setinfo>
+ <title>OH MY GOD!!</title>
+ <author>
+ <othername>The Imitation Crystal</othername>
+ </author>
+ </setinfo>
+
+ <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="mission-chan.xml" />
+
+</set>
\ No newline at end of file