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From: brengle@hpcltjb.HP.COM (Tim Brengle)
Newsgroups: comp.os.cpm
Subject: Re: ADL for CP/M 2.2
Message-ID: <1140008@hpcltjb.HP.COM>
Date: Mon, 14-Sep-87 14:42:26 EDT
Article-I.D.: hpcltjb.1140008
Posted: Mon Sep 14 14:42:26 1987
Date-Received: Thu, 17-Sep-87 06:07:17 EDT
References: <1140007@hpcltjb.HP.COM>
Organization: HP ITG/ISO Computer Language Lab
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For clarification, it is ADL not DDL which I have been working on.
Basically, we (Ross Cunniff and I) started with DDL, "cleaned up and
modernized" the syntax, added features, etc.  The major differences between
ADL and DDL are:

	1.  ADL syntax differs from DDL for conditional and looping constructs.

	2.  ADL introduces the concept of Actors.

	3.  Extensive work has gone into creating a "Zork-like" parser for
	    player input.

Scenarios written in DDL translate easily to ADL, but not vice versa.  In fact,
two of the sample scenarios that come with the package (AARD and MPU) were
originally written in DDL.

I want to acknowledge the great debt that ADL owes to the creators of DDL:
Bruce Adler, Chris Kostanick, Michael Stein, Michael Urban, and Warren Usui,
then members of the UCLA Computer Club.