<?xml version="1.0"?>
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook V3.1//EN" "http://www.w3.org/TR/html4/strict.dtd"
[
<!ENTITY mystring "My String">
]>
<book>
<bookinfo>
  <title>My First Book</title>
  <author><firstname>Jane</firstname><surname>Doe</surname></author>
  <copyright><year>1998</year><holder>Jane Doe</holder></copyright>
</bookinfo>
<preface><title>Foreword</title> ... </preface>
<chapter>&mystring;</chapter>
<chapter> ... </chapter>
<chapter> ... </chapter>
<chapter> ... </chapter>
<appendix> ... </appendix>
<appendix> ... </appendix>
<index> ... </index>
</book>