Talk:International Standard Book Number
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Bug In ISBN-10 C++ Code
I see that the C/C++ code and some of the others have a "return check%10==0" instead of "return check%10==digits". In order to check the validity of the ISBN, you are supposed to compare the checksum to the 13th digit, right? — Preceding unsigned comment added by 220.127.116.11 (talk) 06:40, 25 September 2013 (UTC)
Uniqueness of ISBN's
ISBN's are not unique; I worked in the publishing industry and there are LOTS of ISBN's that are assigned to more than one book. They are assigned to books that don't even share the same title, subject or whatever...
- Citation? Examples? Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 20:58, 10 March 2013 (UTC)
- ISBN 1-55902-983-8 appears to be used for an entire collection of literary classics - I have "The Time Machine" by H.G. Wells under that ISBN, but if you check out some of the sources autolinked by Wikipedia for that ISBN, you can see that it is far from unique. Yevuard (talk) 01:59, 15 August 2013 (UTC)
Actually ISBN is not unique in a conetxt of a Content Model. Print copy and ebook edition must have different ISBNs... The Wikipedia article not report this problem. Since ISBN is "unique title identifier" (which identifies a particular title or edition of a title) there are many ISBNs for the same content (same copyright). Each language version/adaptation, each edition, and each media type, that can be characterized as different product, may have a different ISBN. The Wikipedia article must explain better this problem. --Krauss (talk) 06:10, 15 September 2014 (UTC)
- The indecs Content Model is hardly the Content Model. This is not a problem, it is a feature; if you want an identifier that behaves otherwise, use an identifier designed to behave the way you want. The first sentence under Overview is quite clear: "An ISBN is assigned to each edition and variation (except reprintings) of a book. For example, an ebook, a paperback, and a hardcover edition of the same book would each have a different ISBN." If it were otherwise, you couldn't order ISBN 0-345-44856-7 and know that you're getting a paperback English edition, which would defeat the purpose of ISBNs.--Prosfilaes (talk) 09:16, 15 September 2014 (UTC)
- Ok, the first setence change is important (!). About "the model" or "a model" (I changed), you see that it is not the problem: indecs is the real and practical solution used by DOI, we can cite indecs as a good example of content model for "book content", to avoid ambiguities about "what is content". --Krauss (talk) 11:11, 15 September 2014 (UTC)
- Please check my explanation, it is about "content equivalence", not about editorial mistakes... "Print copy and ebook edition must have different ISBNs", yes is a fact... But, another fact is that Print copy and ebook edition have equivalent contents. People today, after 1990's, Web advent, tablet computers, etc., people today see ebook and book as the same target-product, that is the content. --Krauss (talk) 21:26, 15 September 2014 (UTC)
Need for more explanation or a section about
ISBN uniqueness is "media/edition"-oriented identification of books, as explained above, and made sense in the 1970s. In the 1990s and onward, with PCs, good screens, and the Web, what makes sense is to consider only content, independent of media. A ISBN can not used in a typical database of books as public ID because is not unique (all databases must generate an internal unique ID for this task). For the same reason, the use of ISBN as URN was was not widespread.
This "content-oriented identification" of books' is a repressed demand today (2010's)... So, this kind of non-uniqueness (in a content perspective) is a real and relevant problem.
PS: a solution is possible, a TC 46/SC 9's rule that elects one (ex. the first) ISBN to group the others, representing all the "same-content ISBNs"... And a online service that resolves this "unique ISBN", as xISBN do today.
- Actually in terms of copyright each translation is copyrighted by the translator (and possibly publisher) and having a book doesn't give you the right to use e-book and vice versa. So ISBN should be unique for each edition (e-book, CD, paper -- all different editions). I said it SHOULD, because there are some cases where it is not (as discussed above). --Nux (talk) 18:26, 15 September 2014 (UTC)
- Ops, sorry, here in this subsection we not dissuing translations, only "media/edition" (see above). Usually media/edition changes not change the content... As suggested before, see DOI identified articles (ex. into different medias) to undertand the problem/models/etc. You can also see the Linking ISSN as reference-model to a "unique ISBN". --Krauss (talk) 21:03, 15 September 2014 (UTC)
- About my commented (PS) "solution": see ISSN-L and imagine an ISBN-L. Only imagine, I not discussing here de uniqueness of ISBN (that is necessary for comertial needs, each media is a distinct product), but the necessity and the nowadays-lack of a ISBN-L. --Krauss (talk) 21:13, 15 September 2014 (UTC)
Researcher asking for advice
Hi, I'm a researcher working with massive data sets and I'm trying to find a wiki editor or anyone else who could advise me on the following:
- I would like to download/parse for each ISBN (each book) a time stamp and the ISBNs of books it cites. Does this data set exist anywhere in any format? Thanks a lot!
- I intend to do statistical tests on the data set as a whole, and I'm aware that (similarly to other large data sets) this one is not going be perfect, etc. Well, thanks anyhow for any comments you may have!
ISBN-10 check digit calculation
Hi, While I think it's good to have the single formula for calculating the check digit, which uses modular arithmetic, I think this is too complicated and inaccessible for 99% of readers, who won't know what 'mod' and modular arithmetic is, and won't be inclined to find out, just so they can understand this long formula. Which is unfortunate, as finding the check digit is actually quite simple, and doesn't need to use the language of modular arithmetic. Therefore I think an initial explanation along the lines of the following would enable a lot more people to understand this. Other editors' thoughts? Thanks Mmitchell10 (talk) 06:49, 25 September 2014 (UTC)
The value of the check digit is simply the number which needs to be added to the total of the first nine digits, each multiplied by its weight (descending from 10 to 2), so that the total is the next multiple of 11.
For example, for an ISBN-10 of 0-306-40615-?, the total of the first nine digits is:
The next multiple of 11 is 132, therefore the check digit is 2.
- My issue with including the above text in this article is that it is just a basic explanation of how to do Modular arithmetic. We already link to that page. Having an explanation of how to do it on this page is contrary to the idea of having a hyper-linked document from which the user can follow links to find explanations of terms which they don't understand.
- I agree that the Modular arithmetic article lacks a section with a clear and basic explanation of what it is and how to perform such calculations using ×, ÷, + and -. However, that is an issue for that page. In fact it is a very strong reason to include such an explanation in that article. It is not a reason to include such an explanation in this article unless it is impossible to have a basic explanation of modular arithmetic in the linked article. — Makyen (talk) 17:54, 2 October 2014 (UTC)
- I think I would say that, rather than being an explanation of how to do modular arithmetic, it's an explanation of how to find the check digit without needing to use modular arithmetic. After all, modular arithmetic isn't a necessary part of ISBN calculations or proofs (if memory serves), it's just an alternative/smarter way of handling them. Mmitchell10 (talk) 21:14, 13 October 2014 (UTC)