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Transition to the 13-Digit ISBN for U.S. Publishers (3/4)
2. Add the "978" Bookland EAN prefix that will be used for all legacy 10-digit ISBN identifiers. We now have 978-0-393-04002- 3. We now calculate the Bookland EAN-13 check digit using a weighting algorithm that utilises a modulus 10 check. Note that the hyphens do not take a part in the check-digit calculation, but just serve as a visual aid to make the structure of the Bookland EAN-13 identifier easier to see. Incomplete Bookland EAN-13 = 978-0-393-04002-
Position Total 1 2 3 4 5 6 7 8 9 10 11 12 13
ISBN 9 7 8 0 3 9 3 0 4 0 0 2
Weight 1 3 1 3 1 3 1 3 1 3 1 3 - Product 81 9 21 8 0 3 27 3 0 4 0 0 6 - Check digit = mod10 (10 - mod10 (Product Total)) = mod10 (10 – mod10 (81)) = 9 (Technical note: mod10 of a test number returns the remainder of the test number divided by 10 unless the number is less than 10 in which case it returns the test number itself.) Complete Bookland EAN-13 = 978-0-393-04002-9 Converting from Bookland EAN-13 to a 10-digit ISBN Let’s start with the complete Bookland EAN-13 = 978-0-393-04002-9 1. Strip the check-digit, as a new modulus 11 check-digit will be generated for the 10-digit ISBN. This gives us 978-0-393-04002- 2. Strip the “978” EAN Bookland prefix, giving a 10-digit ISBN string without its check-digit. (Note that only Bookland EAN-13's with "978" in the first 3 positions may be converted into legacy 10-digit ISBN form; books with Bookland EAN-13's with "979"-prefix – which will not be issued until January 1, 2007 - can only be identified in the 13-digit ISBN form. Stripping the “978” prefix gives us 0-393-04002- 3. The 10th digit of the 10-digit ISBN is the modulo 11 check-digit, which will have a value of 0-10, with the value 10 being represented by “X”. Modulus 11 algorithm to calculate check digit for the 10-digit ISBN (check digit unknown) Incomplete 10-digit
ISBN = 0-393-04002-
Position Total 1 2 3 4 5 6 7 8 9 10
ISBN 0 3 9 3 0 4 0 0 2
Weight 10 9 8 7 6 5 4 3 2 -
Product 144 0 27 72 21 0 20 0 0 4 -
Check digit = mod11 (11 - mod11 (Product Total)) = mod11 (11 – mod11 (144)) = 10
(Special case note: When the check digit calculates to 10, it is represented as an "X".)
(Technical note: mod11 of a test number returns the remainder of the test number divided by 11 unless the number is less than 11 in which case it returns the test number itself) Complete 10-digit ISBN = 0-393-04002-X Appendix 2. The role of the ISBN throughout the book industry's value chain The ISBN is the international standard for unique identification of a specific edition of a title by a specific publisher. It is used to identify a specific edition of a title throughout an industry participant's business processes, both internal and those that connect to other participants in the industry value chain. Publishing Houses use ISBN for:
· Identifying firm publication projects from the manuscript to the printer
· Identifying titles in publisher's catalogs and advertisements
· Listing of titles in printed directories, electronic directories and Internet sites · Stock control
· Copyright management
· Management of royalties
· Processing of Orders
· Accounting and Billing
· Monitoring Sales Data
· Producing statistics
· Handling of returns Books In Print services, distribution centers and wholesalers use ISBN for:
· Building bibliographic databases for the book trade like Books In Print
· Building databases of titles in stock