protected List<List<Tuple<string, string>>> ProcessValue(JToken token, string prefix, List<List<Tuple<string, string>>> records)
{
var jValue = token as JValue;
FieldSet.Add(prefix);
var val = Tuple.Create(prefix, jValue.Value == null ? null : jValue.Value.ToString());
records.ForEach(x => x.Add(val));
return records;
}