Go backward to Backus-Naur Form (BNF) Go up to Top Go forward to Ambiguous Syntax Definitions

Example

<digit > ::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9

<operator > ::= + | - | * | /

<numeral > ::= <digit > | <digit > <numeral >

<expression > ::=

<numeral > | ( <expression > ) | <expression > <operator > <expression >

Structure of an expression is illustrated by its derivation tree.