Rel4tion-Wiki/languages/sgn.mdwn

**SGN** is a formal grammar notation. A simple computer language used in this
wiki to define grammars of other computer languages, such as [[Idan]].

SGN is based on [[!wikipedia EBNF]] and on the notation used by
[[!wikipedia W3C]]. Perhaps some other sources too.

The notation is documented at [[/grammar-notation]].