of XHTML
elements.</p>

<p>The process of modularization breaks XHTML up into a series of
smaller element sets. These elements can then be recombined to
meet the needs of different communities.</p>

<p>These modules will be defined in a later W3C document.</p>

<h2><a name="extensions" id="extensions">6.2 Subsets and
Extensibility</a></h2>

<p>Modularization brings with it several advantages:</p>

<ul>
<li>
<p>It provides a formal mechanism for sub-setting XHTML.</p>
</li>

<li>
<p>It provides a formal mech