Backus Naur Form Beispiel
And non terminals which can be expanded into one or more terminals and non terminals.
Backus naur form beispiel. Backus naur form bnf is a notation for expressing the grammar of a language in the form of production rules. Find out more about how this works in today s random wedne. Qlikview backus naur form examples. Let us gain a better understanding of backus naur form through some examples of statements used commonly.
The standard technique for defining the syntax of a computer language is to use backus naur form bnf. The variant used in this tutorial is as follows. Like the bnf is given for a postal address can see below. Bnf or backus naur form is an elegant and succinct way of expressing a grammar in very few lines.
B backus naur form syntax. Each graphic syntax diagram in this book is followed by a link to a text description of the graphic. Postal address name part street address zip part name part persona1 part last name opt suffix part eol. This is a short introduction to the backus naur form of describing a context free grammar with some simple examples.
The syntax in this reference is presented in a simple variation of backus naur form bnf that uses the following symbols and conventions. Bnf grammars consist of terminals which are items that can appear in the language i e etc. For instance in. 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.
Bnf was originally developed by john backus and subsequent contribution from peter naur to describe the syntax of algol 60 programming. Braces enclose a choice of items only one of which is required. Symbol or convention description brackets enclose optional items. The metalanguage is a formal notation for specifying the grammar that describes the syntax of a programming language.
