The first nine codes of 978+ISBN +EAN check code constitute 13 EAN- 13 barcode; the first seven codes of 977+ISSN +00+EAN check code constitute 13 EAN- 13 barcode.

13

The international standard number of the code is usually divided into five parts (10 code is four parts), and different parts are clearly separated by hyphens-or spaces, and the number of digits can be changed, and the hyphens can be ignored when the system processes; Leading digit

Ensure that this string of numbers can be judged as an international standard book number. If necessary, the hyphen must be correctly marked; They can let users clearly judge the relationship between numbers and publishers and their countries.

PIID is an irregular periodical publication.

In the past, ISBN had no country and language codes. After ISBN appeared, the country code of books published in the United States was 0. 1 is in English.

One is the country, and the other is the French-speaking country; 3 is a German-speaking country, 4 is Japanese, 5 is suitable for Russian-speaking countries, 7 is Chinese mainland and so on. The longest country field may be five digits (for example, Bhutan is 99936), but the remaining digits that can be used and allocated are narrower.