ExtremeBnf

XBNF stands for eXtreme BNF (BackusNaurForm) and is an attempt to see how far BNF can be stretched:

http://www.csci.csusb.edu/dick/papers/rjb99g.xbnf.html

Samples:

http://www.csci.csusb.edu/dick/samples/index.html

-- RichardBotting