* use a direct mapping to map this class to SubjectConfirmationData
node having the xsi:type attribute.
* overload get_xmlNode method to add the xsi:type attribute on output.
* lasso/xml/xml_idff.h:
this header file reference all id-ff 1.2 elements
* lasso/xml/xml_idwsf.h:
this header file reference all id-wsf 1.0 elements
* lasso/xml/saml-2.0/xml_saml2.h:
this header file reference all saml-2.0 elements