This is a tracking category. It is used to build and maintain a list or lists of pages—primarily for the sake of the lists themselves and their use in article and category maintenance. It is not part of the encyclopedia's categorization scheme.
More information:
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Administrators: Please do not delete this category as empty! This category may be empty occasionally or even most of the time. |
This category is populated by pages and templates that use {{ISMN}}.
In this template, ISMN parameters are checked for invalid ISMNs as well as extraneous text such as "ISMN", "N/A", "none", dashes (use hyphens instead), lower-case "x" (use "X" instead), and tab characters.
Error messages for erroneous ISMNs look like one of:
Invalid ISMN