formation. Ultimately, it will be possible to
develop XHTML-conforming content that is usable by any XHTML-conforming
user agent.</li>

</ul>
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<h1><a name="defs" id="defs">2. Definitions</a></h1>

<h2><a name="terms" id="terms">2.1 Terminology</a></h2>

<p>The following terms are used in this specification. These
terms extend the definitions in <a href="#ref-rfc2119">
[RFC2119]</a> in ways based upon similar definitions in ISO/<abbr
title="International Electro-technical Commission">IEC</abbr>