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PmWiki 2.2.0 (beta24) is now distributed with a module for Creole markups. To enable Creole, simply add the following line to a local customization:
In addition to enabling Creole markup, the module also switches the graphical edit buttons to use creole sequences instead of PmWiki's default sequences.
To experiment with Creole markups, use either this page or the Creole-Sandbox.
See discussion at Creole-Talk