1<?xml version="1.0" encoding="utf-8"?> 2<!DOCTYPE book 3 PUBLIC "-//Norman Walsh//DTD DocBk XML V3.1.7//EN" 4 "/dtd/3.1.7/docbookx.dtd"> 5<book id="book"> 6<title>Book Title</title> 7 8<chapter id="ch1"> 9<title>test</title> 10<para>How many ° can you ©.</para> 11<para>And what about <xref linkend="ch1"/>.</para> 12<para>And what about <xref linkend="s1"/>.</para> 13 14<programlisting> 15This is a program 16listing. 17</programlisting> 18 19</chapter> 20</book> 21