语言
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EBNF
- ISO 14977
- Information technology -- Syntactic metalanguage -- Extended BNF
Production = name "=" [ Expression ] ";" ;
Expression = Alternative { "|" Alternative } ;
Alternative = Term { Term } ;
Term = name | TOKEN | Group | Option | Repetition ;
Group = "(" Expression ")" ;
Option = "[" Expression "]" ;
Repetition = "{" Expression "}" ;