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This Lua module is used on approximately 487,000 pages, or roughly 1% of all pages. To avoid major disruption and server load, any changes should be tested in the module's /sandbox or /testcases subpages, or in your own module sandbox.
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This module is subject to page protection.It is a highly visible module in use by a very large number of pages, or is substituted very frequently. Because vandalism or mistakes would affect many pages, and even trivial editing might cause substantial load on the servers, it is protected from editing.
This template uses Module:Check isxn to validate the ISBN. If the ISBN is not valid, this subtemplate will still generate the link, and it will add the article to Category:Pages with ISBN errors . Since invalid ISBNs are sometimes used in publications, it is possible to disable the validity check for individual ISBNs given as parameters.
This check is essential for programs that use file handling. Format check Checks that the data is in a specified format (template), e.g., dates have to be in the format YYYY-MM-DD. Regular expressions may be used for this kind of validation. Presence check Checks that data is present, e.g., customers may be required to have an email address ...
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This page can be created with WPCleaner. [1] To update it: start WPCleaner and connect to English Wikipedia ;; click on Bot tools ;; click on List ISBN errors ;; wait a few moments to let WPCleaner compute the number of articles, and answer Yes ;
Appendix 1 of the International ISBN Agency's official user manual [17]: 33 describes how the 13-digit ISBN check digit is calculated. The ISBN-13 check digit, which is the last digit of the ISBN, must range from 0 to 9 and must be such that the sum of all the thirteen digits, each multiplied by its (integer) weight, alternating between 1 and 3 ...