Backus-Naur Form - Definition. Was ist Backus-Naur Form
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Was (wer) ist Backus-Naur Form - definition

ONE OF THE TWO MAIN NOTATION TECHNIQUES FOR CONTEXT-FREE GRAMMARS IN COMPUTER SCIENCE
Backus-Naur Form; Backus normal form; Backus Naur form; Backus Naur Form; Panini–Backus form; Backus-Naur form; Panini-Backus form; Panini–Backus Form; Panini-Backus Form; BNF grammar; Backus-Naur notation; Backus-Naur; Backus–Naur Form; Backus Normal Form; Backus-naur form; Backus–naur form; BNF notation; BN form; BN Form; BN-form; Backus–Naur; Backus Naur
  • BNF [[syntax diagram]]

BackusNaur form         
In computer science, BackusNaur form () or Backus normal form (BNF) is a metasyntax notation for context-free grammars, often used to describe the syntax of languages used in computing, such as computer programming languages, document formats, instruction sets and communication protocols. It is applied wherever exact descriptions of languages are needed: for instance, in official language specifications, in manuals, and in textbooks on programming language theory.
Backus-Naur Form         
<language, grammar> (BNF, originally "Backus Normal Form") A formal metasyntax used to express context-free grammars. Backus Normal Form was renamed Backus-Naur Form at the suggestion of Donald Knuth. BNF is one of the most commonly used metasyntactic notations for specifying the syntax of programming languages, command sets, and the like. It is widely used for language descriptions but seldom documented anywhere (how do you document a metasyntax?), so that it must usually be learned by osmosis (but see RFC 2234). Consider this BNF for a US postal address: <postal-address> ::= <name-part> <street-address> <zip-part> <personal-part> ::= <name> | <initial> "." <name-part> ::= <personal-part> <last-name> [<jr-part>] <EOL> | <personal-part> <name-part> <street-address> ::= [<apt>] <house-num> <street-name> <EOL> <zip-part> ::= <town-name> "," <state-code> <ZIP-code> <EOL> This translates into English as: "A postal-address consists of a name-part, followed by a street-address part, followed by a zip-code part. A personal-part consists of either a first name or an initial followed by a dot. A name-part consists of either: a personal-part followed by a last name followed by an optional "jr-part" (Jr., Sr., or dynastic number) and end-of-line, or a personal part followed by a name part (this rule illustrates the use of recursion in BNFs, covering the case of people who use multiple first and middle names and/or initials). A street address consists of an optional apartment specifier, followed by a street number, followed by a street name. A zip-part consists of a town-name, followed by a comma, followed by a state code, followed by a ZIP-code followed by an end-of-line." Note that many things (such as the format of a personal-part, apartment specifier, or ZIP-code) are left unspecified. These lexical details are presumed to be obvious from context or specified somewhere nearby. There are many variants and extensions of BNF, possibly containing some or all of the regexp wild cards such as "*" or "+". EBNF is a common one. In fact the example above isn't the pure form invented for the ALGOL 60 report. "[]" was introduced a few years later in IBM's PL/I definition but is now universally recognised. ABNF is another extension. (1997-11-23)
Backus Normal Form         

Wikipedia

Backus–Naur form

In computer science, Backus–Naur form () or Backus normal form (BNF) is a metasyntax notation for context-free grammars, often used to describe the syntax of languages used in computing, such as computer programming languages, document formats, instruction sets and communication protocols. It is applied wherever exact descriptions of languages are needed: for instance, in official language specifications, in manuals, and in textbooks on programming language theory.

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).