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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 hidden on its member pages—unless the corresponding user preference (Appearance → Show hidden categories) is set.; These categories are used to track, build and organize lists of pages needing "attention en masse" (for example, pages using deprecated syntax), or that may need to be edited at someone's earliest convenience.
Some ISBNs may still have been printed correctly elsewhere in the same book or corrected in later editions; if further research shows that to be the case (and that the new ISBN still refers to an edition with the same information on the same pages), then the invalid# parameter should be moved or {{Listed Invalid ISBN}} should be replaced with {}.
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.
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 ...
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.
If the ISBN is failing to validate, it is likely that there is a typo in the main part of the number. In this case, recalculating the check digit results in an apparently valid ISBN that leads to the wrong source (or to nowhere). 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 ...