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