What do the subsets of classics and history mean respectively?

"Subsets of Classics and History" are four categories of ancient books in China. From the Book of the New Tang Dynasty: "Each of them has four books, followed by A, B, C and D, which are listed in the four databases of the subset of Confucian classics." So what are the subsets of classics and history respectively?

1, Jing: refers to Confucian classics; For example, The Analects of Confucius and Mencius.

2, history: history books, that is, official history; Such as twenty-four histories.

3. Zi: Hundreds of works in the pre-Qin period, religion; For example, everything is wrong, guiguzi and so on.

4, set: selected books, that is, poetry collections. Generally refers to the ancient classics of China. Such as Chuci, Daojing, Buddhist scriptures, etc.

The subset of classics and history refers to these.