WSN has been used in several international standards, starting with ISO 10303-21.
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Originally proposed by Niklaus Wirth in 1977 as an alternative to Backus–Naur Form (BNF), it has several advantages over BNF in that it can be defined using itself, it contains an explicit iteration construct, and it avoids the use of an explicit symbol for the empty string (such as
syntax | Theodore Wirth | Nick Wirth | Big O notation | Syntax | Niklaus Wirth | Herman Wirth | Hauser & Wirth | Alan Wirth | Z notation | Syntax (from Trace Elements) | Reverse Polish notation | Whyte notation | Theodore Wirth House-Administration Building | Parts-per notation | Billy Wirth | Wilhelm Wirth | Tim Wirth | The final form of Braille's alphabet, according to Henri (1952). The decade diacritics are listed at left, and the supplementary letters are assigned to the appropriate decade at right. Characters are derived by combining the diacritic on the left with the basic letters at top. "(1)" indicates markers for musical and mathematical notation. Parentheses and quotation marks follow English Braille | that book's notation | Syntax (band) | Sin and Syntax | Siegbahn notation | Scrambling (syntax) | scientific pitch notation | Reverse Polish Notation | reverse Polish notation | quote notation | Portable Game Notation | Louis Wirth |