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Procedural Page Description Languages

Published online by Cambridge University Press:  05 May 2010

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Summary

ABSTRACT

An important goal of document preparation systems is that they be deviceindependent, which is to say that their output can be produced on a variety of printing devices. One way of achieving that goal is to devise a device-independent page description language, which can describe precisely the appearance of a formatted page, and to produce software that prints the required image on each variety of printer. Most attempts at device-independent page description languages have failed, resulting either in schemes that are only partially device-independent or in proclamations from researchers that device independence is a bad idea [2, 4].

A new generation of procedural page description languages promises a solution. The PostScript language, and to a lesser extent the Interpress language, offers a means of describing a printed page with an executable program; the page is printed by loading the program into the printer and running it.

Page Description Languages

An imaging device, such as a typesetter, laser printer, or display, must have some way of knowing what image it is being asked to show. The two traditional means of providing it with that information have been to describe the image to the imager in terms of a bitmap or character map or describe the image to the imager by means of a sequence of control commands to the imager's electronics.

The bit-map or character-map schemes are the simplest and oldest. For example a line printer is provided with a character map (in this spot put the character in this spot put the character and so forth).

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Text Processing and Document Manipulation
Proceedings of the International Conference, University of Nottingham, 14-16 April 1986
, pp. 214 - 223
Publisher: Cambridge University Press
Print publication year: 1986

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