成员的完整列表，这些成员属于 x1::xlt_sse_l1_index_t,包括所有继承而来的类成员

close_px	x1::xlt_sse_l1_index_t
high_px	x1::xlt_sse_l1_index_t
last_px	x1::xlt_sse_l1_index_t
last_update_time	x1::xlt_sse_l1_index_t
low_px	x1::xlt_sse_l1_index_t
md_stream_id	x1::xlt_sse_l1_index_t
num_trades	x1::xlt_sse_l1_index_t
open_px	x1::xlt_sse_l1_index_t
prev_close_px	x1::xlt_sse_l1_index_t
security_code	x1::xlt_sse_l1_index_t
security_type	x1::xlt_sse_l1_index_t
sending_time	x1::xlt_sse_l1_index_t
total_value_traded	x1::xlt_sse_l1_index_t
total_volume_traded	x1::xlt_sse_l1_index_t
trad_ses_mode	x1::xlt_sse_l1_index_t
trade_date	x1::xlt_sse_l1_index_t
trading_phase_code	x1::xlt_sse_l1_index_t