inMessageRefChild = sequenceBuilder.element(InMessageRef.class)
.required()
.qNameElementReference(Message.class)
.build();
outMessageRefChild = sequenceBuilder.element(OutMessageRef.class)
.qNameElementReference(Message.class)
.build();
errorRefCollection = sequenceBuilder.elementCollection(ErrorRef.class)
.qNameElementReferenceCollection(Error.class)