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To confirm the check digit, calculate the sum of all eight digits of the ISSN multiplied by their position in the number, counting from the right. (If the check digit is X, add 10 to the sum.) The remainder of the sum modulo 11 must be 0. There is an online ISSN checker that can validate an ISSN, based on the above algorithm. [7]
If the number is valid the result will be 0. ... then-- validate the issn: 8 digits long, containing only 0-9 or X in the last position valid_issn = false; ...
The ISSN or International Standard Serial Number identifies a serial publication, such as a newspaper, magazine, or academic journal, or blog; it is the periodical counterpart of the ISBN for a book. It does not identify a particular issue or a particular article in an issue.
The ISSN refers to the particular publication, not to a specific issue (or date) of that publication. The ISSN is used to help establish the publication as a Wikipedia reliable source. For a publication with the ISSN 1234-5678, use {{ISSN|1234-5678}}. The template supports up to 9 ISSNs.
An EAN-13 number includes a 3-digit GS1 prefix (indicating country of registration or special type of product). A prefix with a first digit of "0" indicates a 12-digit UPC-A code follows. A prefix with first two digits of "45" or "49" indicates a Japanese Article Number (JAN) follows.
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This template is used to mark an International Standard Serial Number (ISSN) that may not be valid. For example: {{issn | 1234-56789}} {{Please check ISSN}}
This is the ISSN for the serial, in this case the Journal of the American Society for Information Science (199412) The chronology part is in parentheses and identifies the date of publication. In this case, it is signified by year and month; 1994 December 45:10 The enumeration part signifies the volume and number; Vol. 45, no. 10.