李宗邺先生《中国历史要籍介绍》(上海古籍出版社一九八二年八月版)第一编《绪论》部分,在介绍隋唐整理史籍概况时说:“到玄宗开元时,元行冲撰《群书四录》,经、史、子、集的四分法创始。”就我所见,古籍目录四分法的创始,当远溯于魏晋。魏元帝时,秘书郎郑默编定一部国家藏书目录,叫《中经》。这部目录久佚,且缺乏具体记载,故内容不得详知。但据梁阮孝绪《七录》序得知:西晋初叶秘书监荀 Mr. Li Zongtao introduced the introduction of the history of Chinese books in the history of the Sui and Tang Dynasties when he said: “When the Xuanzong Kaiyuan, Yuanxingchuang The Book of Four Records, founded by the four-point system of history, son, and collection, ”As far as I can see, the founding of the four-point method of the ancient books catalog dates back to the Wei and Jin dynasties. Wei Yuan emperor, the secretary Lang Zhengmo compiled a national catalog of books, called “in the classics.” This directory is long lost, and the lack of specific records, so the content can not know in detail. However, according to Liang Ruanxiao Xu “seven recorded” sequence that: the early Western Yee Xuan Xun secretary