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Wikipedia’s article on Backus-Naur form is http://en.wikipedia.org/wiki/Backus-Naur_form. It’s a great place to start if you don’t know the basics of grammars and parsing. As Wikipedia points out, BNF might better be called Panini-Backus Form. The grammarian Panini gave a precise description of Sanskrit more than 23 centuries earlier in India using a similar notation.