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BNF    
巴科斯范式

巴科斯范式

{Backus-Naur Form}. Originally Backus Normal Form.

[{Jargon File}]

Backus-Naur Form (TTCN, ...)

BNF: /B·N·F/, n. 1. [techspeak] Acronym for Backus Normal
Form (later retronymed to Backus-Naur
Form because BNF was not in fact a normal form), a metasyntactic
notation used to specify the syntax of programming languages, command sets,
and the like. Widely used for language descriptions but seldom documented
anywhere, so that it must usually be learned by osmosis from other hackers.
Consider this BNF for a U.S. 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 are presumed to be obvious from context or detailed
somewhere nearby. See also parse.


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英文字典中文字典相关资料:


  • BNF (British National Formulary) | NICE
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  • Backus–Naur form - Wikipedia
    In computer science, Backus–Naur form or Pāṇini-Backus Form (BNF or PBF, pronounced ˌbækəs ˈnaʊər ), also known as Backus normal form, is a notation system for defining the syntax of programming languages and other formal languages, developed by John Backus and Peter Naur
  • British National Formulary | BNF Publications
    Join us as we celebrate 20 years of BNF for Children (BNFC) supporting health professionals make confident decisions about the safe and effective use of medicines in children
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  • Boilermakers National Funds
    You can access forms by signing in to the Participant Portal or you can submit a request by contacting our office at any of the following: BNF@Wilson-McShane com, call 866-342-6555 – option 6, or by mail at PO Box 909700 Kansas City, MO 64190-9700
  • What are BNF and EBNF in Programming? - freeCodeCamp. org
    BNF and EBNF are simple and powerful notations to write what computer scientists call context-free grammar In simple terms it means the expansion of a non-terminal is not dependent on the context (surrounding symbols), that is it's context-free
  • BNF + BNFC - Apps on Google Play
    British National Formulary (BNF) and BNF for Children (BNFC) are the first choice for concise medicines information and trusted by healthcare professionals to support confident decision-making
  • BNF Notation in Compiler Design - GeeksforGeeks
    BNF stands for Backus Naur Form notation It is a formal method for describing the syntax of programming language which is understood as Backus Naur Formas introduced by John Bakus and Peter Naur in 1960
  • BNF
    BNF Group is a Singapore-based company with activities in Industrial Gas Supply Chain Management, Environmental Services, Engineering and Sustainable Solutions
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