+ yajl_gen_string_cast (data->handler, "first_value_time", strlen ("first_value_time"));
+ yajl_gen_double (data->handler, first_value_time_double);
+
+ yajl_gen_string_cast (data->handler, "interval", strlen ("interval"));
+ yajl_gen_double (data->handler, interval_double);
+
+ yajl_gen_string_cast (data->handler, "data", strlen ("data"));