Class books are unique reference books in ancient China. It is a reference book that compiles various categories or a certain category of information and arranges it according to a certain method (usually classification) to facilitate the reference of things.
A political book is a book that classifies and compiles laws and regulations, and it is a compilation of political, economic, military and cultural systems of various dynasties. It's also sorted. In nature, it actually belongs to the category of books. Such as the "general code", "general examination documents" and "meetings" in past dynasties.
Book classification:
According to the content, books can be divided into two categories. One is comprehensive, including the contents of heaven, earth, people, things and things, and sorting out the existing literature. Large-scale books, such as Taiping Magnolia, Siku Quanshu, and Integration of Ancient and Modern Books, are extremely rich in information. The other kind is specialized, such as Tai Ping Guang Ji, which collects novels and classifies ancient novels according to their contents.