1<?xml version="1.0"?>
2<!DOCTYPE root [
3<!ENTITY % deftest "&#60;!ELEMENT test (#PCDATA) >">
4<!ENTITY % defmiddle "&#60;!ELEMENT middle (test) >">
5<!ENTITY % defroot "&#60;!ELEMENT root (middle) >">
6<!ELEMENT root (middle)>
7<!ELEMENT middle (test)>
8<!ELEMENT test (#PCDATA)>
9]>
10<root><middle><test>sample</test></middle></root>
11