What's with the book coding?

Book coding is the structure of Chinese standard book number, which consists of an international standard book number (ISBN), a book classification and a book number.

The first part of China Standard Book Number (ISBN) is the main part of this numbering system and can be used independently. It consists of 13 digits, separated by a hyphen "-",and is divided into four parts, which respectively represent the group number, publisher number, book number and parity bit.

The lengths of the other three segments are variable, except that the parity bit is fixed at one bit, but the sum of the digits of these three segments must be nine bits, and a parity bit is added, so that the digits of the serial number length 1SBN are always equal to 10. When the parity bit is 10, it is represented by the capital letter "X", and when the parity bit is 1 1, it is represented by "O".

Extended data

China Library Classification includes five categories, including Marxism-Leninism, Mao Zedong Thought, philosophy, social science, natural science and comprehensive books, and 22 basic categories. Common book coding categories are as follows:

I Marxism-Leninism, Mao Zedong Thought and Deng Xiaoping Theory.

b？ Philosophy, religion

Introduction to social science

d？ Politics, law

e？ military affairs

f？ economy

g？ Culture, science, education, sports

h？ Language, writing

Me? literature

j？ art

k？ History, geography

n？ Introduction to natural science