Another idea might be to tag mechanics so that you can filter them out. Have a separate topic for 4e Elves, Pathfinder Elves, and FATE Elves, and tag them so that you can set a scope filter to only show the articles/topics for the game system you're working in.
The downside is this seems like it would create a huge data duplication issue...
I think I would just make separate realms for setting and for mechanics and then combine them in whatever combination I needed.
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