Data describing this action.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>if a TagExtraInfo object is associated with this TagInfo, the result of
         getTagExtraInfo().getVariableInfo( data ), otherwise null.</dd>
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<h4>isValid</h4>
<pre>public&nbsp;boolean&nbsp;isValid(<a href="../../../../jakarta/servlet/jsp/tagext/TagData.html" title="class in jakarta.se