XML Schema for Theatrical Scripts?

skunkeh asks: "I was recently discussing innovative uses for IRC bots with a friend and we came up with the idea of using bots for theatrical performances, with different bots taking on different roles and outputting a pre-defined script to a moderated IRC channel. The obvious solution for inputing scripts to the bots would be using XML - is anyone aware of an XML standard for play scripts or would we need to create our own?" Bots doing Shakesspeare? Hrmm....OK, after that image, this is the last time I post Slashdot articles while drinking Bawls.