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While ikiwiki supports hierarchically categorising pages by creating [[SubPages|ikiwiki/SubPage]], that's often not flexible enough, and it can also be useful to tag pages in various non-hierarchical ways.

Since this is a wiki, tagging is just a form of linking. The general rule is that all tags are links, but not all links are tags. So a tag is a special link that ikiwiki knows is intended to be used as a tag.

Generally you will tag a page without putting a visible link on it. The [[tag_plugin|plugins/tag]] allows you to do so, like this:

\[[!tag mytag othertag thirdtag]]

You can also tag a page with a visible link:

\[[!taglink mytag]]

This tag will be displayed just like a regular [[ikiwiki/WikiLink]].

One way to use these tags is to create a [[ikiwiki/blog]] of pages that have a particular set of tags. Or just look at the [[BackLinks]] to a tag page to see all the pages that are tagged with it. [[Plugins]] can be written to do anything else with tags that you might desire.

Once you have tags, you can use the [[plugins/pagestats]] plugin to generate tag clouds.