n='urn:ISBN:0-395-36341-6' xml:lang="en" lang="en"&gt;
  &lt;title&gt;Cheaper by the Dozen&lt;/title&gt;
  &lt;isbn:number&gt;1568491379&lt;/isbn:number&gt;
  &lt;notes&gt;
    &lt;!-- make HTML the default namespace for a hypertext commentary --&gt;
    &lt;p xmlns='http://www.w3.org/1999/xhtml'&gt;
        This is also available &lt;a href="http://www.w3.org/"&gt;online&lt;/a&gt;.
    &lt;/p&gt;
  &lt;/notes&gt;
&lt;/book&gt;
</pre>
</div>

<h2><a name="uaconf" id="uaconf">3.2 User Agent
Conformance</a></