Path: utzoo!attcan!uunet!lll-winken!lll-tis!helios.ee.lbl.gov!pasteur!ucbvax!SUN.COM!owen
From: owen@SUN.COM (Owen Densmore)
Newsgroups: comp.windows.news
Subject: PostScript programming
Message-ID: <8812081944.AA10206@bigmac.sun.com>
Date: 9 Dec 88 00:28:01 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 21

With DPS being made available as a product, PostScript programming
will become far more wide spread.  In particular, we've found in NeWS
that use of classes and inheritance is the most natural way to manage
large PostScript systems.

Is there any DPS version of the NeWS class.ps file in existance
today or being worked on?  If so, I'd like to coordinate the
NeWS version with it so we have a single OOP model shared between
the two systems.  In particular, we are looking at a very simple
form of multiple inheritance derived from David Singer's work
while he was at Schlumberger.

The model is quite simple: the superclass specification may include an
array of superclasses.  Note that class Object simply uses an empty
array, rather than the "null" it used to use.  Amazingly enough, the
code reduced in size in the conversion from single to multiple
inheritance.

If at all possible, I'd like the evolution of the classing mechanism
in NeWS and DPS to be coordinated.

Owen Densmore