XTTviewer is a simple plugin that allows display of XTT2 rule trees within the wiki pages as presented below.
To know more about XTT2 representation see: http://ai.ia.agh.edu.pl/wiki/hekate:xtt2.
To present XTT2 trees on the wiki pages, simply put the HMR file inside the <hmr></hmr> tags (observe the source of this page).