

<?xml versionfiltered="1.0" standalone="no"?>
<!DOCTYPE webapp [
<!ENTITY servlets SYSTEM "servlets.xml">
]>
<webapp>
&servlets;
</webapp>

where servlets.xml has

<servlet>
<servlet-name>blah</servlet-name>
<display-name>blah</display-name>
<servlet-class>blah.blahclass/servlet-class>
</servlet>
