This is a maintenance category , used for maintenance of the Wikipedia project . It is not part of the encyclopedia and contains non-article pages , or groups articles by status rather than subject. Do not include this category in content categories.

This is a container category . Due to its scope, it should only contain subcategories .

This is a tracking category . It builds and maintains a list of pages primarily for the sake of the list itself. They are not part of the encyclopedia's categorization scheme .

The subcategories of this category are other tracking categories. To add a category to this category, tag it with {{ Tracking category }} or {{ Wikipedia category |tracking=yes}} .

• This category is hidden on its member pages —unless the corresponding user preference (appearance → show hidden categories) is set.
• These categories can be 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.
• These categories also serve to aggregate members of several lists or sub-categories into a larger, more efficient list ( discriminated by classifications ).