public void setLexicalHandler (LexicalHandler handler) {
        if (handler == null) {
            throw new NullPointerException("Null lexical handler");
        }
        else {
            this.lexicalHandler = handler;
        }
    }
<p>Writes the closing tag of an {@link Element}</p>

@param element <code>Element</code> to output.
@throws IOException if the element could not be written
xmppserver/src/main/java/org/jivesoftware/util/XMLWriter.java