--- /dev/null
+<?xml version="1.0" encoding="iso-8859-1"?>
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [
+<!ENTITY % ug-ent SYSTEM "ug-ent.xml">
+%ug-ent;
+<!ENTITY ug-book SYSTEM "ug-book.xml">
+]>
+
+<book id="users-guide">
+&ug-book;
+</book>