The idea of BotML is to address the issue of creating bots that can be portable, open, and easy to write and update.

BotML current state does not handle all the use cases yet. But the groundwork is laid and it can be extended with quite some ease.

I'm happy to collect any feedback and comments you guys may have!

Not to be pedantic, but is it really a markup language?

markup - The notation that is used to indicate how text should be displayed.

(emphasis mine)

Anyway, looks really neat and easy to use. Might take it for a spin in a pet weekend project.