* This method fires a <code>PropertyChangeEvent</code> for the property
* {@link #PAYLOAD_STRUCTURE} if the payload type changes.
*
*/
public void setNoPayload() {
PayloadStructureType old = getPayloadStructureType();
boolean change = (old != PayloadStructureType.NONE);
setPayloadStructureType(PayloadStructureType.NONE);
setProperty(PAYLOAD_ENTITYTYPE_ID, EntityType.None.getId());
xmlPayloadStructure = null;
setProperty(PAYLOAD_DOCUMENT_ID, null);