Subinterface of SoapFault that exposes SOAP 1.2 functionality. Necessary because SOAP 1.1 differs from
SOAP 1.2 with respect to SOAP Faults.
author: Arjen Poutsma since: 1.0.0
Returns an iteration over the fault subcodes. The subcodes are returned in order: from top to bottom.
an Iterator that contains QNames representing the fault subcodes