At the request of the authors, the text of this paper has been removed
from the PLoP-97 Technical Report.  For more information, please
contact the authors directly.


Title of the paper: A Pattern Language of Transport Systems (Driver Duty
Constructor)

Ted Foster
ted@class-sc.demon.co.uk
Class Software Construction Ltd.
4 Duchy Road, Harrogate, North Yorkshire, HG1 2EP, England
Tel. & Fax: +44 1423 503301

Liping Zhao
liping@cs.rmit.edu.au
Department of Computer Science
RMIT, Bundoora Campus
Bundoora, Victoria, 3083, Australia
Tel. +61 3 9407 6123
Fax +61 3 9407 6139

ABSTRACT

In this paper, we present a Driver Duty Constructor pattern, 
which is part of our pattern language, PLOTS. This pattern
 consists in the main of three other transport object patterns (TOPS): 
Driver Duty Builder and Driver Duty Director which work together
 to build all the basic parts of a Driver Duty and then assemble them
 into a whole product. The Driver Duty pattern supports a tree structure 
for explicitly ordering and layering the components that define a driver
 duty. Each component in a driver duty has one corresponding builder.
 These Driver Duty Builder objects are represented in perfect symmetry
 with the Driver Duty objects that they are responsible for building.
 Both of them use a Cascade of Composite patterns for this purpose. 
The Driver Duty Director pattern is structured as a Strategy pattern 
and directs the building process.  The interaction of all these contributory
 patterns defines the overall Driver Duty Constructor pattern, which in
 turn forms a part of a larger Driver Duty Scheduler system.
 The emphasis in this paper is on pattern interactions rather
 than individual patterns in isolation.

Subject area: Pattern Languages