[spec] Looking for a write-up on the grammar notation

[Dibyendu Majumdar]

On Wednesday, 15 May 2019 at 23:57:55 UTC, Dibyendu Majumdar 
wrote:
> As part of this I would like to add something about the grammar 
> notation. Is there any write up available that describes how to 
> read the notation?
>

Interestingly I could probably just use the words by Dennis 
Ritchie back in 1975: 
https://www.bell-labs.com/usr/dmr/www/cman.pdf

Looks like even the latest C and C++ standards essentially follow 
that.