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In computer science, Backus–Naur form (BNF; / ˌ b æ k ə s ˈ n aʊər /; Backus normal form) is a notation used to describe the syntax of programming languages or other formal languages. It was developed by John Backus and Peter Naur. BNF can be described as a metasyntax notation for context-free grammars. Backus–Naur form is applied ...
BNF British National Formulary bol. bolus: as a large single dose (usually intravenously) BP, Ph.Br. Pharmacopoeia Britannica: British Pharmacopoeia BS blood sugar BSA body surface area b.t. bedtime mistaken for "b.i.d", meaning twice daily bucc. bucca: buccal (inside cheek) cap., caps. capsula: capsule cap. capiat: let him take (let the ...
Some of the widely used formal metalanguages for computer languages are Backus–Naur form (BNF), extended Backus–Naur form (EBNF), Wirth syntax notation (WSN), and augmented Backus–Naur form (ABNF). Metalanguages have their own metasyntax each composed of terminal symbols, nonterminal symbols, and metasymbols. A terminal symbol, such as a ...
In computer science, extended Backus–Naur form (EBNF) is a family of metasyntax notations, any of which can be used to express a context-free grammar. EBNF is used to make a formal description of a formal language such as a computer programming language. They are extensions of the basic Backus–Naur form (BNF) metasyntax notation.
BNF (Backus normal form, or Backus–Naur form) and EBNF (extended Backus-Naur form) are the two main notation techniques for context-free grammars.; Drakon-charts are a graphical notation of algorithms and procedural knowledge.
BNF may refer to: Science. Backus–Naur form, a formal grammar notation in computer science; Biological nitrogen fixation; British National Formulary, ...
Below is a simple grammar, defined using the notation of regular expressions and Extended Backus–Naur form. It describes the syntax of S-expressions, a data syntax of the programming language Lisp, which defines productions for the syntactic categories expression, atom, number, symbol, and list:
A production rule in R is formalized mathematically as a pair (,), where is a nonterminal and () is a string of variables and/or terminals; rather than using ordered pair notation, production rules are usually written using an arrow operator with as its left hand side and β as its right hand side: .