<?xml version="1.0"?> <!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"> <chapter><title>Some Chapter</title><abstract><para> In brief, … </para></abstract><para> In this chapter, … </para></chapter>