Template:Please check ISSN

Safer nicotine wiki Tobacco Harm Reduction

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This template should not be used in citation templates such as Citation Style 1 and Citation Style 2, because it includes markup that will pollute the COinS metadata they produce; see Wikipedia:COinS.

Usage

This template is used to mark an International Standard Serial Number (ISSN) that may not be valid. For example:

{{issn|1234-56789}} {{Please check ISSN}}

The template does not produce any visible change to the article (unless the article is viewed in preview mode):

ISSN 1234-56789 Parameter error in {{issn}}: Invalid ISSN.

Rather, it adds the article to the hidden maintenance/tracking category: Category:Articles with invalid ISSNs.

In preview mode, it shows the warning message (Warning: Check ISSN). This warning is shown only in preview mode.

The optional parameter |reason= simply provides a comment to explain why the ISSN may not be valid. For example:

{{issn|1234-56789}} {{Please check ISSN|reason=Too many digits.}}