EBNF
EBNF(Extended Backus–Naur Form、拡張バッカス・ナウア記法)
EBNF - Wikipedia
ISO-14977
ISO/IEC 14977 : 1996(E)
BNF and EBNF: What are they and how do they work?
BNF/EBNF variants
#BNF記法