Displaying modular Xml with XSL

Hi there,

I have created a modular xml file as below:

<?xml version="1.0"?>
<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
[<!ENTITY chapter1 SYSTEM "otherDivisions.xml">
<!ENTITY chapter2 SYSTEM "corporateServices.xml">]>

<TOPICLIST>
&chapter1;
&chapter2;

<TOPICS TYPE="PROCEDURES" OnImg="procedures.gif" OutImg="procedures_f2.gif" width="180">
<TOPIC>
<TITLE>ABI Claims Code</TITLE>
<URL>/procedures/abi/abi_claims_code_contents.htm</URL>
</TOPIC>
<TOPIC>
<TITLE>Claims Procedures</TITLE>
<URL>/procedures/claims procedures/claims_procedures_contents.htm</URL>
</TOPIC>
<TOPIC>
<TITLE>Complaints</TITLE>
<URL>/procedures/Complaints/Complaints Contents Page.htm</URL>
</TOPIC>
<TOPIC>
<TITLE>DPA</TITLE>
<URL>/procedures/dpa/dpa_contents.htm</URL>
</TOPIC>
<TOPIC>
<TITLE>System Guides</TITLE>
<URL>/procedures/system_guides/system guides contents.htm</URL>
</TOPIC>
</TOPICS>


I have an XSL file which displayed the above xml file prior to me modularising it (i.e. taking out sections and including them as chapters). The xml file not longer displays properly and I am wondering whether this is because of the inclusion of the chapters or the fact that I have now had to include a doctype tag (to get the chapters working in the first place).

Is there a method to displaying these chapters with XSL?

Cheers Guys.