ode> is an instance of
  <code>DOMSource</code>, then
  modifications to the encapsulated DOM tree change the message
  payload in-place, there is no need to susequently call
  <code>setPayload</code>. Other types of <code>Source</code> provide only
  read access to the message payload.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The contained message payload; returns <code>null</code> if no
          payload is present in this message.</dd>
</dl>
</li>
</ul>
<a id="setPayload(javax.xm