I agree with DeMo, though I have heard of YAML. I wouldn't use it in a web project though, and the language I do use apart from PHP doesn't have a binding. So I can't/won't experiment with it.

Edit: Let me rephrase that: it kinda has a binding, but it's either incomplete or unstable on roughly 25% of YAML's features.

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Programmers are in a race with the Universe to create bigger and better idiot-proof programs, while the Universe is trying to create bigger and better idiots. So far the Universe is winning. - Rich Cook