PlantUML is a MediaWiki extension.

Status for Mediawiki4Intranet distribution:

Usage

This extension adds one tag — <uml>...</uml>. You should put correct PlantUML code in place of <…>. PlantUML has its own language, you can read its description here: http://sourceforge.net/projects/plantuml/files/PlantUML%20Language%20Reference%20Guide.pdf/download

Also you can read more at the extension homepage: http://www.mediawiki.org/wiki/Extension:PlantUML

Installation