baseA.setVarInt(new BigInteger("1"));
ObjectFactory objectFactory = new ObjectFactory();
JAXBElement<? extends SgBaseTypeA> elementA = objectFactory.createSg01BaseElementA(baseA);
SgDerivedTypeB derivedB = new SgDerivedTypeB();
derivedB.setVarInt(new BigInteger("32"));
derivedB.setVarString("SgDerivedTypeB");
JAXBElement<? extends SgBaseTypeA> elementB = objectFactory.createSg01DerivedElementB(derivedB);
ChoiceWithSubstitutionGroup x = new ChoiceWithSubstitutionGroup();
x.setSg01BaseElementA(elementA);