thod is called. May be null</dd>
<dt>Returns:</dt>
<dd>whether the namespace is used in this library</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="containsTagHandler(java.lang.String,java.lang.String)">
<h3>containsTagHandler</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name">containsTagHandler</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java