Yes, it is a great article, but it saddens me that we have to invoke XML to explain S-expressions rather than the other way around. S-expressions have been aro

Yes, it is a great article, but it saddens me that we have to invoke XML to explain S-expressions rather than the other way around. S-expressions have been around since 1958! They are maybe the best reason that everyone should learn Lisp even if they don't wind up using it much, just so they know there are problems it already solved long ago, and they don't need to reinvent the wheel.