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    [
      <!ENTITY chapter1 SYSTEM "chapter1.xml">
      <!ENTITY chapter2 SYSTEM "chapter2.xml">
      <!ENTITY chapter3 SYSTEM "chapter3.xml">
      <!ENTITY chapter4 SYSTEM "chapter4.xml">
      <!ENTITY chapter5 SYSTEM "chapter5.xml">
      <!ENTITY chapter6 SYSTEM "chapter6.xml">
      <!ENTITY chapter7 SYSTEM "chapter7.xml">
      <!ENTITY appendix1 SYSTEM "appendix1.xml">
      <!ENTITY appendix2 SYSTEM "appendix2.xml">
    ]
>

<book>
<title>Open1x User's Guide</title>
<bookinfo>
<authorgroup>
<author>
<firstname>Chris</firstname>
<surname>Hessing</surname>
</author>
<author>
<firstname>Nick</firstname>
<surname>Petroni</surname>
</author>
<author>
<firstname>Bryan</firstname>
<surname>Payne</surname>
</author>
<author>
<firstname>Nick</firstname>
<surname>Petroni</surname>
</author>
<author>
<firstname>Terry</firstname>
<surname>Simons</surname>
</author>
</authorgroup>
</bookinfo>
&chapter1
&chapter2
&chapter3
&chapter4
&chapter5
&chapter6
&chapter7
&appendix1
&appendix2
</book>
