⑵ The classification organization of ancient documents in China has formed a classification system of seven points, four points and twelve points.
Seven points: Seven Views by Liu Xiang and Liu Xin, Seven Records by Wang Jian and Seven Records by Ruan Xiaoxu.
Quadrant method: firstly, the four-part classification method is put forward. Sui Shu Jing Ji Zhi established a four-part system of Jing, Shi, Zi and Ji in the Tang and Wei Dynasties, and the four-part system was adopted in the Qing Dynasty's Sikuquanshu Catalogue.
Dichotomy: Zheng Qiao's General Annals of Literature and Art
The quartering method has been used for the longest time, the greatest influence and the dominant position in China.
⑶ Yongle Dadian is the largest kind of book in China, and it is a retrieval tool with the nature of subject method.