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Note that the ISBN hyphenation rule-base is a living document. This is a maintenance category of articles with invalid ISBNs. It is often included by means of the template {{Please check ISBN}}. If you fix an ISBN please remove the template or category from the article. Many article/ISBN problems are listed at WikiProject Check Wikipedia.
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 ...
This category is populated by {} and {} (with parameter invalid#=yes) and by {{Listed Invalid ISBN}}, to indicate that although the given ISBN is malformed it is indeed printed on the work. These malformed ISBNs can still be looked up via Special:BookSources in the usual way despite the prominent warning — it just means that fewer Find this ...
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 ...
Either hide them in a comment, or make the template produce "The ISBN x-xxx-xxxx-xx given for this publication is invalid; if you know the correct one, please consider fixing it.", with 'consider fixing it' linked to this (or another) page explaining the use of the ISBN template.
If you remove the {{ISBN missing}} template without fixing the problem in one of the above ways, someone else will come along later and flag the reference with {{ISBN missing}} again! TemplateData This is the TemplateData for this template used by TemplateWizard , VisualEditor and other tools.
The template takes as argument a valid ISBN and yields the formatted version of that ISBN. Any existing hyphens in the ISBN are ignored, whether or not they are correctly placed: {{format ISBN|97-8-1-57181655-9}} → 978-1-57181-655-9 {{Format ISBN}} is intended to be substituted so that the template call in wikitext is replaced with the ...
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.