Talk:International Standard Book Number
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External links modified[edit]
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- Added archive https://web.archive.org/web/20040912203458/http://www.isbn-international.org/en/download/implementation-guidelines-04.pdf to http://isbn-international.org/en/download/implementation-guidelines-04.pdf
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Price of registration[edit]
I don't think that the price of getting an ISBN number issued in different countries is encyclopedic information. I propose we remove it. --Macrakis (talk) 21:23, 5 April 2018 (UTC)
Incorrect ISBN-13 check-digit calculation[edit]
The calculation:
r = (10 - (sum) mod 10)
fails for ISBN-13 values where the remainder is 0 such as:
- 978-0-522-86467-0
- 978-3-598-21549-0
- 978-3-598-21552-0
- 978-3-598-21565-0
- 978-3-598-21578-0
- 978-3-598-21581-0
- 978-3-598-21594-0
A change to:
r = (10 - sum) mod 10
works for these cases.
A sample python program is available at:
https://gist.github.com/tonyallan/e8e55bfcf6868641dc323316603b1cb7
with some test data:
https://gist.github.com/tonyallan/2e4cce9f16232eb6517e0eebca0da945
python3 isbn.py < isbn.txt
TonyAllanAU (talk) 06:48, 24 April 2018 (UTC)
Registration Group Element[edit]
I see in multiple places differing descriptions of what this element is. Is it a *language* code, or is it a *country* code? If I want to publish a Chinese-language book in the UK, should it have a Chinese *language* code or a UK *country* code? This needs authoritively clarifying.