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<h1>XHTML Modularization</h1>
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<p class="intro">The XHTML modularization-model defines the modules of XHTML.</p>
<hr />
<h2>Why XHTML Modularization?</h2>
<p>XHTML is a simple, but large language. XHTML contains most of the functionality a
web developer will need.</p>
<p>For some purposes XHTML is too large and complex, and for other purposes it's too simple.</p>
<p>By splitting XHTML into modules, the W3C (World Wide web Consortium) has
created small and well-defined sets of XHTML elements that can be used
separately for small devices, or combined with other XML standards into
larger and more complex applications.</p>
<p>With modular XHTML, designers can:</p>
<ul>
<li>Choose the elements to be supported by a device using standard XHTML
building blocks</li>
<li>Add extensions to XHTML, using XML, without breaking the XHTML standard</li>
<li>Simplify XHTML for devices like hand held computers, mobile phones, TV,
and home appliances</li>
<li>Extend XHTML for complex applications by adding new XML functionality (like MathML,
SVG, Voice and Multimedia)</li>
<li>Define XHTML profiles like XHTML Basic (a subset of XHTML for mobile
devices)</li>
</ul>
<hr />
<h2>XHTML Modules</h2>
<p>W3C has split the definition of XHTML into 28 modules:</p>
<table class="ex" cellspacing="0" width="100%" border="1">
<tr>
<th valign="top" align="left" width="35%">Module name</th>
<th valign="top" align="left" width="65%">Description</th>
</tr>
<tr>
<td valign="top">Applet Module</td>
<td valign="top">Defines the deprecated* applet element</td>
</tr>
<tr>
<td valign="top">Base Module</td>
<td valign="top">Defines the base element</td>
</tr>
<tr>
<td valign="top">Basic Forms Module</td>
<td valign="top">Defines the basic forms elements</td>
</tr>
<tr>
<td valign="top">Basic Tables Module</td>
<td valign="top">Defines the basic table elements</td>
</tr>
<tr>
<td valign="top">Bi-directional Text Module</td>
<td valign="top">Defines the bdo element</td>
</tr>
<tr>
<td valign="top">Client Image Map Module</td>
<td valign="top">Defines browser side image map elements</td>
</tr>
<tr>
<td valign="top">Edit Module</td>
<td valign="top">Defines the editing elements del and ins</td>
</tr>
<tr>
<td valign="top">Forms Module</td>
<td valign="top">Defines all elements used in forms</td>
</tr>
<tr>
<td valign="top">Frames Module</td>
<td valign="top">Defines the frameset elements</td>
</tr>
<tr>
<td valign="top">Hypertext Module</td>
<td valign="top">Defines the a element</td>
</tr>
<tr>
<td valign="top">Iframe Module</td>
<td valign="top">Defines the iframe element</td>
</tr>
<tr>
<td valign="top">Image Module</td>
<td valign="top">Defines the img element</td>
</tr>
<tr>
<td valign="top">Intrinsic Events Module</td>
<td valign="top">Defines event attributes like onblur and onchange</td>
</tr>
<tr>
<td valign="top">Legacy Module</td>
<td valign="top">Defines deprecated* elements and attributes</td>
</tr>
<tr>
<td valign="top">Link Module</td>
<td valign="top">Defines the link element</td>
</tr>
<tr>
<td valign="top">List Module</td>
<td valign="top">Defines the list elements ol, li, ul, dd, dt, and dl</td>
</tr>
<tr>
<td valign="top">Metainformation Module</td>
<td valign="top">Defines the meta element</td>
</tr>
<tr>
<td valign="top">Name Identification Module</td>
<td valign="top">Defines the deprecated* name attribute</td>
</tr>
<tr>
<td valign="top">Object Module</td>
<td valign="top">Defines the object and param elements</td>
</tr>
<tr>
<td valign="top">Presentation Module</td>
<td valign="top">Defines presentation elements like b and i</td>
</tr>
<tr>
<td valign="top">Scripting Module</td>
<td valign="top">Defines the script and noscript elements</td>
</tr>
<tr>
<td valign="top">Server Image Map Module</td>
<td valign="top">Defines server side image map elements</td>
</tr>
<tr>
<td valign="top">Structure Module</td>
<td valign="top">Defines the elements html, head, title and body</td>
</tr>
<tr>
<td valign="top">Style Attribute Module</td>
<td valign="top">Defines the style attribute</td>
</tr>
<tr>
<td valign="top">Style Sheet Module</td>
<td valign="top">Defines the style element</td>
</tr>
<tr>
<td valign="top">Tables Module</td>
<td valign="top">Defines the elements used in tables</td>
</tr>
<tr>
<td valign="top">Target Module</td>
<td valign="top">Defines the target attribute</td>
</tr>
<tr>
<td valign="top">Text Module</td>
<td valign="top">Defines text container elements like p and h1</td>
</tr>
</table>
<p>* Deprecated elements should not be used in XHTML.</p>
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