Backus Naur Form Beispiel

In computer science backus naur form pronunciation 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 they are applied wherever exact descriptions of languages are needed.

Backus naur form beispiel. Qlikview backus naur form examples. The standard technique for defining the syntax of a computer language is to use backus naur form bnf. B backus naur form syntax. Find out more about how this works in today s random wedne.

Braces enclose a choice of items only one of which is required. Bnf was originally developed by john backus and subsequent contribution from peter naur to describe the syntax of algol 60 programming. The metalanguage is a formal notation for specifying the grammar that describes the syntax of a programming language. Like the bnf is given for a postal address can see below.

Bnf grammars consist of terminals which are items that can appear in the language i e etc. Bnf backus naur form is a syntactic metalanguage i e a language about a language. Each graphic syntax diagram in this book is followed by a link to a text description of the graphic. Bnf or backus naur form is an elegant and succinct way of expressing a grammar in very few lines.

This is a short introduction to the backus naur form of describing a context free grammar with some simple examples. Let us gain a better understanding of backus naur form through some examples of statements used commonly. Postal address name part street address zip part name part persona1 part last name opt suffix part eol. The text descriptions are a simple variant of backus naur form bnf syntax that includes the symbols and conventions explained in table b 1.

For instance in. And non terminals which can be expanded into one or more terminals and non terminals. The syntax in this reference is presented in a simple variation of backus naur form bnf that uses the following symbols and conventions. The variant used in this tutorial is as follows.