his
specification.</dd>

<dt>Unspecified</dt>

<dd>When a value or behavior is unspecified, the specification
defines no portability requirements for a facility on an
implementation even when faced with a document that uses the
facility. A document that requires specific behavior in such an
instance, rather than tolerating any behavior when using that
facility, is not a Strictly Conforming XHTML Document.</dd>
</dl>

<h2><a name="general" id="general">2.2 General Terms</a></h2>

<dl>
<dt>Attribute</dt>

<dd