laration in the document prior to
the root element. The public identifier included in
the DOCTYPE declaration must reference one of the three DTDs
found in <a href="#dtds">Appendix&#160;A</a> using the respective
Formal Public Identifier. The system identifier may be changed to reflect
local system conventions.</p>

<pre>
&lt;!DOCTYPE html 
     PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
     "http://www.w3.org/TR/1999/PR-xhtml1-19991210/DTD/xhtml1-strict.dtd&gt;

&lt;!DOCTYPE html 
     PUBLIC "-//W3C//DTD 