The current map used to display the Transition initiatives in France is on Google Map and is only showing the local initiatives but not the different sub groups of each initiative.

I would like to create a new map on an open source site including filters on type of groups we have like : food, repair caf��, bicycle workshop, inner transition, meditation, .... So the need is to have categories and sub-categories. This is also useful to tag articles in web sites or Events (we do it already but with a from scratch categories).

My question is to know if somebody has spent time on it to build a categorization that we could use as a good basis to share, enhance and translate ?