assertEquals(false, st3.isComplex());
SimpleTypeSG sst3 = st3.getSimpleTypeSG();
assertEquals(false, sst3.isAtomic());
assertEquals(false, sst3.isList());
assertEquals(true, sst3.isUnion());
UnionTypeSG ut = sst3.getUnionType();
TypeSG[] uTypes = ut.getMemberTypes();
assertEquals(2, uTypes.length);
}