Hey, I need to know something urgently :).

I made a 'set' of 7 wonders, but I only want to allow each player to create max 1 of these. In other words, the player has to choose one of these, and when it's completed, he can't built another.

What's the best way to do this through XML or Python (please provide a little snippet if this is the case; I'm a noob with Python)?

Please help :o

I seem to recall that I built 3 different corps in one game, so perhaps that's not the best example you're using?

(certain corporations can coexist while others can't)

But okay, it's changed.