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The ISBN may have been incorrectly labelled invalid, but we have (to our surprise) found several examples where the publisher has put an invalid number on the book (see talk page for examples). Note that just because a number has not been identified as invalid, it doesn't mean it corresponds to the book in question, or indeed any book.
This template accepts three parameters; one unnamed and two named: |1= (unnamed parameter) – (required) the ISBN to be formatted |separator= – (optional) accepts one predefined keyword: space; when |separator=space, the rendered ISBN elements are separated using a space character; for any other value, this template renders with hyphen separators
invalid character – ISBN has one or more 'digits' that is not in the allowed set appropriate to ISBN length invalid prefix – 13-digit ISBNs must begin with '978' or '979' invalid form – 10-digit ISBNs with the mis-positioned 'X' character invalid group id – 13-digit ISBN begins with '9790'; this prefix / group ID combination is reserved ...
Entries with invalid ISBNs that are nonetheless printed in a book can be tagged with {{Listed Invalid ISBN}}. Also, if particular ISBNs in a list of ISBNs are known to be invalid, this can be indicated by providing corresponding invalid1=yes to invalid9=yes parameters in the {{ ISBN }} or {{ ISBNT }} templates.
Barcode format compatibility is maintained, because (aside from the group breaks) the ISBN-13 barcode format is identical to the EAN barcode format of existing 10-digit ISBNs. So, migration to an EAN-based system allows booksellers the use of a single numbering system for both books and non-book products that is compatible with existing ISBN ...
If you only have a 10-digit ISBN, do use the number as-is, do not try to convert it to the 13-digit form. If the ISBN as printed in your source is refusing to validate, do check both the front matter and the book cover for ISBNs. It is not uncommon for the ISBN to be misprinted in the front matter but correct on the cover. Do preview your edit ...
OTOH, contributors with an ISBN from the book in their hand may feel obligated to add the ISBN to the article. Perhaps we could create a template {{Invalid ISBN|2-204-19850-9}} that results in <!-- Invalid ISBN: 2-204-19850-9 -->. Would that cause google searchs for the invalid ISBN to bring up the article?
Use this template to create a link (or list of links) to Special:BookSources for one or more International Standard Book Numbers with the usual "ISBN" prefix Template parameters [Edit template data] Parameter Description Type Status ISBN #1 1 first ISBN to put in the list Example 0-674-01181-3 String required ISBN #2 2 second ISBN to put in the list Example 0-674-04200-3 String suggested ISBN ...