xtends <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block">A validation message from either TagLibraryValidator or TagExtraInfo.
 <p>
 As of JSP 2.0, a JSP container must support a jsp:id attribute
 to provide higher quality validation errors.
 The container will track the JSP pages
 as passed to the container, and will assign to each element
 a unique "id", which is passed as the value of the j