EBNF

EBNF, aka extended Backus-Naur form, is a grammar language created in 1977 by Niklaus Wirth.

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In computer science, extended Backus-Naur form (EBNF) is a family of metasyntax notations, any of which can be used to express a context-free grammar. EBNF is used to make a formal description of a formal language which can be a computer programming language. They are extensions of the basic Backus–Naur form (BNF) metasyntax notation. Read more on Wikipedia...

EBNF Wikipedia page
There are at least 0 EBNF repos on GitHub
file extensions for EBNF include ebnf
EBNF on HOPL
CodeMirror package for syntax highlighting EBNF
Pygments supports syntax highlighting for EBNF
GitHub supports syntax highlighting for EBNF
See also: (3 related languages)Pascal, XML, Regular Expressions

Example from Linguist:

(*
  Source:  https://github.com/io7m/jsom0
  License: ISC
*)

digit_without_zero =
  "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" ;

digit =
  "0" | digit_without_zero ;

positive =
  digit_without_zero , { digit } ;

natural =
  "0" | positive ;

real =
  [ "-" ] , digit , [ "." , { digit } ] ;

Example from Wikipedia:

function application = list( symbol, { expression } );

Feature	Supported	Token	Example
Comments	✓		(* A comment *)
MultiLine Comments	✓	(* *)	(* A comment *)
Semantic Indentation	X

EBNF - Grammar language

Language features