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Cite is the software extension for the footnotes system. Cite.php includes error checking and generates error messages using MediaWiki interface messages. When Cite.php encounters an error, it generates a message pulled from a MediaWiki interface page. The MediaWiki pages are customized to use {{Broken ref}} to control the display of the error message and to add a category. {{Broken ref}} uses namespace detection to choose whether pages are categorized or not and if error messages show or not.