a is not defined by the service (i.e. anyType)</li>
  <li>the data needs to be available as XML because it will be subject
to further processing as XML (i.e. XML schema, transforms etc)</li>
</ul>
<br>
The XML property is a type TIdSoapXMLElement, which is a proxy class
for a real XML implementation. Any library wishing to make use of this
will need to treat this as one of the real implementations in order to
access the native XML implementation<br>
<br>
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