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I always found the wiki implementations available as XOOPS modules or very feature poor or too buggy, so I started to search for a better solution. After some search I found what became for me the very best wiki php implementation for simple things: Dokuwiki. The formatting engine is rich, the version management is good with a nice compare function, supports namespaces, is really fast and the installation process could not be simpler. The only drawback is, arguably, the flat file persistance, which can be sometimes an advantage itself, but this is not the point.
The next step would be to make Dokuwiki work as a XOOPS module and I figured out this is a piece of cake.
I wrote a simple guide to help other people do the same.
http://www.garbelini.net/modules/dokuwiki/doku.php?id=xoops:dokuwiki
Dokuwiki:
http://wiki.splitbrain.org/wiki:dokuwiki
Cheers,
Marco Garbelini