ent</code> instance. The <code>SOAPElement</code>
 is expected to be created by a
 <code>SOAPFactory</code>. Callers should not rely on the
 element instance being added as is into the XML
 tree. Implementations could end up copying the content
 of the <code>SOAPElement</code> passed into an instance of
 a different <code>SOAPElement</code> implementation. For
 instance if <code>addChildElement()</code> is called on a
 <code>SOAPHeader</code>, <code>element</code> will be copied
 into an instance of a <code