Hi, theducks and kovidgoyal
Quote:
Originally Posted by theducks
The information is still there, you just lost the parse (publisher and book number) implied part. BPH gets 1 or 2 digits of Publisher, while a vanity press may only get 1 digit of book number.
Note ISBN 13 (EAN) does not have the check digit that ISBN10 does (0-9,X)
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Quote:
Originally Posted by kovidgoyal
There is no information lost by removing hyphens, hyphens are there simply for humans to read, the ISBN number means the same thig with or without hyphens
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The information can only be found if combined with the current version of a 156K XML file.
The file defines the codes (of varying length) that the International ISBN agency assigns to each National ISBN agency. It then describes the ranges that each National ISBN agency will use for allocating Registrant codes. Note that these ranges are allocated by National ISBN agencies according to the structure of their national publishing industry. (Example: Israel (3-digit code) allocates 2-digit registrants in the range 00-19, while neighboring Jordan (4-digit code) allocates 2-digit registrants in the range 10-49. Their ranges for 3-digit and 4-digit registrants also differ, while Jordon has a single 1-digit registrant and Israel has a range of 5-digit registrants.)
Yes, the publisher information is contained within the 13 digits of the ISBN, but due to variable length Registration Group and Registrant, it is impossible to obtain without either
(1) hyphens separating each part of the ISBN, or
(2) code to apply the International ISBN agency XML file.
If you go to
https://www.isbn-international.org/r...ile_generation, you can get a copy of the XML file (Or a PDF file for humans to read).
BTW, just to be clear, ISBN-13 has a check digit, calculated using a Modulus 10 system with alternate weights of 1 and 3. (see
https://www.isbn-international.org/content/what-isbn). A different formula from the ISBN-10, but still a check digit.
I agree that
the information is there, in theory. However,
it is not accessible. To offer an analogy, you have a PGP encrypted message, but you do not have the decrypt key. The information is present, but unobtainable.