Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!rutgers!bellcore!MERLIN.wif.ctt.bellcore.com!attila
From: attila@breeze.bellcore.com
Newsgroups: comp.databases
Subject: object-oriented/semantic data models:- implementation.
Message-ID: <24985@bellcore.bellcore.com>
Date: 5 Jul 90 15:41:51 GMT
Sender: news@bellcore.bellcore.com
Reply-To: attila@breeze.bellcore.com
Organization: Bellcore - Wierd Ideas Factory
Lines: 41

> hello 
> 
> I am interesting in getting some information( articles, books....)
> on 
> 	1) the implementation of semantic data model(s) on a relational 
> 	   back-end.
> and/or	2) the implementation of object-oriented data model(s) on a relational
> 	   back-end.
> 
> please mail replies to coms1024@waikato.ac.nz
> 
> if there is enough interest, i shall summerize to the net.
> 
> thank you
> patricia

Two of the better known ones are Carlo Zanilio's GEM implemented on a
Britton-Lee relational database machine and Lynnabeck & Vinnau's attempt
at implementing Iris on an exiting H-P relational back end.  For GEM see
ACM-SIGMOD Proceedings, San Jose, 1983.  [I cannot recall the Iris
reference but you can run a library search on either Iris or the
authors.]


Leslie A. Walko
Bell Communications Research
Database & Systems Research Group

p.s.  How about some semantic implementations on a non-relational
system?  SIM is an extremely well done implementation of Hammer &
McLeod's SDM on Unisys DMSII.  [Granted, they re-wrote most of DMSII in
the process]  It is available commercially, so call your sales rep.
See "SIM: Implementation of a Database Management System Based on a
Semantic Data Model" by R. L. Guck, B. L. Fritchman, J. P. Thompson, D.
M. Tolbert, in IEEE Data Eng. Bulletin, 1988.

You might also be interested in a *real* oodb,ms done from scratch, but
using many relational concepts in the query optimizer.   Statice was
done by Weinreb, Lamb and Gerson.  It is a very nice (and fast) oodbms
strongly based on DAPLEX.  It is available from Symbolics, 617/221-1000,
Burlington, MA.