private TypeSchema BuildCore(NullSchema w, NullSchema r)
 {
     return(new NullSchema(r.RuntimeType));
 }
 private void VisitCore(NullSchema s)
 {
     s.Serializer = new NullSerializer(s);
 }
 private TypeSchema BuildCore(NullSchema w, NullSchema r)
 {
     return new NullSchema(r.RuntimeType);
 }