<?xml version="1.0" standalone="no"?>
-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
+<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
+
+<!ENTITY % BOOK_ENTITIES SYSTEM "./entities.ent">
+%BOOK_ENTITIES;
]>