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A way of arranging items where an item can be a parent or child of another. Categories are an example of a hierarchical taxonomy.

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Tag wikis help introduce newcomers to the tag. They contain an overview of the topic defined by the tag, along with guidelines on its usage.

All registered users may propose new tag wikis.

(Note that if you have less than 20000 reputation, your tag wiki will be peer reviewed before it is published.)

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