This is amaintenancecategory, used formaintenance of the Wikipedia project. It is not part of the encyclopedia and containsnon-article pages, or groups articles by status rather than subject. Do not include this category in content categories (except foreponymous maintenance categories).

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The following articles have infoboxes with 'no date' entered in thedate field (date of speakers estimation). This prevents the obsolescence calculation. It should be done when the reference for the population figure does not supply a date; this is fairly common withEthnologue.

• Hidden categories
• Noindexed pages
• Language articles with invalid population dates