NAME：该笔资料的检索代号 (retrieval code of the series)
DESCRIPTION：该笔资料之全名 (full name of the series)
FREQ：该笔资料之频率 (available frequencies of the series)
( A：年资料，Q：季资料，M：月资料，W：周资料，D：日资料，S：半年资料)
START：该笔资料在资料库之起始期间 (beginning date of the series)