Backus Normal Form (BNF)
Definition - What does Backus Normal Form (BNF) mean?
Backus Normal Form (BNF) is a metasyntactic notation procedure used to specify the syntax of computer programming languages, command/instruction sets, document formatting and communication protocols. BNF is applied when language descriptions are required.
BNF is also known as Backus-Naur form.
Techopedia explains Backus Normal Form (BNF)
A BNF specification is a derivation rule set that is usually written as follows:
- The <symbol>::_expression_where <symbol> is a non terminal
- The _expression_consists of one or more symbol sequences.
- A vertical bar (|) delineates other sequence options.
- Symbols not appearing on the left side are terminals.
- Symbols appearing on the left side are located within the symbol-expression pair and are non-terminals.