?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if <code>metadataElement</code>
 is <code>null</code>.</dd>
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<h4>element</h4>
<pre>public&nbsp;<a href="../../../../jakarta/xml/ws/wsaddressing/W3CEndpointReferenceBuilder.html" title="class in jakarta.xml.ws.wsaddressing">W3CEndpointReferenceBuilder</a>&nbsp;element(<a href="https://docs.oracle