So far repetition classes (= collection classes) have been implemented
only in limited ways in both Demeter/C++ and Demeter/Java.
The reason is that that there is a huge implementation space
to choose from. Don Batory from the University of Texas
has solved this problem with the GenVoca generator 
P2 [batory:subjectivity].

P2, adapted to the needs of Demeter/Java, leads to a general
implementation of collection classes for Demeter/Java.
In
http://www.ccs.neu.edu/research/demeter/sources/DemeterJava/examples
in directory j-GenVoca is some explanation:

program.cd  	grammar for GenVoca generators
program.input  	P2 adapted to Demeter/Java
README		this file


Reference:
@ARTICLE{batory:subjectivity,
AUTHOR = "Don Batory and Bart Geraci",
TITLE = "Composition Validation and Subjectivity in GenVoca Generators",
JOURNAL = "IEEE Transactions on Software Engineering",
YEAR = 1997,
PAGES = "67-82",
MONTH = "February",
VOLUME = 23,
NUMBER = 2
}                


From dsb@cs.utexas.edu Mon Apr 28 11:19:17 1997
From: dsb@cs.utexas.edu (Don Batory)
Date: Mon, 28 Apr 1997 10:19:07 -0500
To: Karl Lieberherr <lieber@ccs.neu.edu>
Subject: Re: GenVoca/P2

Hi Karl:

Incidentally, rather than the paper that you suggested your students
to read, I'd suggest this one (from my publication web page):

31.Don Batory, Vivek Singhal, Jeff Thomas, and Marty Sirkin. Scalable Software Libraries. In Proceedings of the ACM SIGSOFT '93 Conference (Los Angeles), December 1993. 

Don