Title:		A Formal Language for Design Patterns

Authors names:	Amnon H. Eden, Joseph (Yossi) Gil, Amiram Yehudai
Contact name:	Amnon Eden
email address:	eden@math.tau.ac.il
Postal address:	Amnon Eden, The Department of Computer Science, School of
		Mathematics, Tel Aviv University, P.O.Box 39040, Tel Aviv
		69978, Israel.
Personal address: Amnon Eden, P.O.Box 53387, Tel Aviv 61533, Israel.
Phone number:	(+972 3) 6470907
Fax number:	(+972 3) 6484570

The abstract of this article follows:

This article sets forth a rigorous approach to the concept of a
'design pattern language'. We present a method of using a programming
language to manipulate constructs of ordinary OOP language (such as
classes and relations). We show that the specification of many design
patterns can phrased as algorithms in this metaprogramming
environment. The advantage is in delivering a precise method of
defining design patterns. In addition, we present a 'patterns wizard',
a tool that automates the application of patterns by metaprogramming
techniques without hiding the source code text from the programmer. We
conclude with three case studies that demonstrate how the application
of design patterns can be automated using metaprogramming techniques.

Keywords: Design patterns, metaprogramming, the programmer's apprentice.