//Upgrade DTModel to new class
Object model = xt.fromXML( xml );
GuidedDecisionTable52 newDTModel;
if ( model instanceof GuidedDecisionTable ) {
GuidedDecisionTable legacyDTModel = (GuidedDecisionTable) model;
newDTModel = upgrader1.upgrade( legacyDTModel );
} else {
newDTModel = (GuidedDecisionTable52) model;
}