<?xml version="1.0"?> <!DOCTYPE para PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"> <para> For a complete methodology for DTD creation, see <citetitle pubwork="book">Developing SGML DTDs: From Text to Model to Markup</citetitle> by Eve Maler and Jeanne El Andaloussi. </para>