效绵鼎 BNF Notation Grammars for programming languages are often written in BNF (Backus-Naur Form ) Variables are words in <...>Example: <statement>. Terminals are often multicharacter strings indicated by boldface or underline;Example: while or WHILE .17BNF Notation ◼ Grammars for programming languages are often written in BNF (Backus-Naur Form ). ◼ Variables are words in <…>; Example: <statement>. ◼ Terminals are often multicharacter strings indicated by boldface or underline; Example: while or WHILE. 17