4.15 Characters, Strings, and Virtual Strings

Characters in Oz are modelled by integers between 0 and 128 as specified by the ASCII table. In Oz we can write

&a 

to obtain the ASCII number of the letter a. Strings are lists of characters. For instance

&a 

A virtual string is either a string, an atom, or a comosition

V1#...#Vn

of virtual strings. When you want to pass strings from Oz to the outside you can freely use virtual strings instead of strings. For instance, we can define URL compositionally:

declare AuthorURL = 'http://www.ps.uni-sb.de/~niehren' 
declare CourseDir = 'Web/Vorlesungen/Oz-NL-SS01/vorlesung' 
declare CourseURL = AthorURL#'/'#CourseDir