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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
    Online access to the BNF (British National Formulary) content within the UK, provided by NICE
  • The Bibliothèque nationale de France Catalogue Général | BnF . . .
    The BnF General Catalogue is the online catalogue containing the majority of references and documents conserved on all BnF sites
  • British National Formulary - BNF | RPS
    Practical and evidence based, British National Formulary (BNF) is the only drug formulary in the world that is both independent, and has rigorous, accredited content creation processes
  • British National Formulary | BNF Publications
    BNF and BNFC are available online through MedicinesComplete The essential app for iOS and Android to access medicines information on the go Essential reference books – BNF and BNFC are updated regularly in print
  • Accueil | BnF – Site institutionnel
    The BnF’s mission is to collect, catalogue, preserve, enrich and communicate the national documentary heritage The BnF ensures that as many people as possible have access to its collections, both on-site and remotely, and develops national and international cooperation
  • Drugs A to Z | BNF | NICE
    Browse drug monographs by A to Z Drug monographs describe the uses, doses, safety issues, medicinal forms and other considerations involved in the use of a drug Browse the complete list of drugs, alphabetically
  • Gallica – The BnF digital library | BnF – Institutional website
    The documents selected by the BnF illustrate the French written heritage and its influence in Europe and worldwide They compose an encyclopaedic and comprehensive library, representative of major French authors and of the various trends of reflection and research over the centuries
  • About | BNF | NICE
    Online access to the BNF (British National Formulary) content within the UK, provided by NICE
  • Research Library (all sites) | BnF – Institutional website
    The BnF Research Library is composed of 4 sites in the Paris region (Richelieu, Arsenal, Opéra and François-Mitterrand) and of one site in Avignon, the Maison Jean-Vilar Consult our collections freely as well as the 39 million documents kept in our library storage
  • How to use BNF Publications online | About | BNF | NICE
    This How to Use the BNF is key to understanding the structure of the BNF for all healthcare professionals involved with prescribing, monitoring, supplying, and administering medicines, as well as supporting the learning of students training to join these professions





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