Difference between revisions of "Backus–Naur Form"
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Revision as of 07:10, 11 May 2016
In computer science, BNF (Backus Normal Form or Backus–Naur Form) is one of the two main notation techniques for context-free grammars.
Description
Context-free grammars are often used to describe the syntax of languages used in computing, such as:
They are applied wherever exact descriptions of languages are needed. for instance in:
- Official language specifications
- Manuals
- Textbooks on programming language theory
Extensions and variants
Many extensions and variants of the original Backus–Naur notation are used; some are exactly defined, including Extended Backus–Naur Form (EBNF) and Augmented Backus–Naur Form (ABNF).
van Wijngaarden form
The other main technique for writing context-free grammars is the van Wijngaarden form.
See also
- Attribute grammar
- Computer science
- Formal grammar
- Syntax (programming languages)
- Van Wijngaarden grammar
External links
- Backus–Naur Form @ Wikipedia
