-Plugins can be used to add additional features to ikiwiki. The interface
-is quite flexible, allowing plugins to implement additional markup
-languages, register [[PreProcessorDirective]]s, hook into [[CGI]] mode,
-and more. Most of ikiwiki's features are actually provided by plugins.
-Ikiwiki's backend RCS support is also pluggable, so support for new
-revision control systems can be added to ikiwiki.