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From: Deutsch.PA@PARC-MAXC.ARPA
Newsgroups: net.lang.prolog
Subject: Arrays
Message-ID: <15989@sri-arpa.UUCP>
Date: Mon, 23-Jan-84 16:00:00 EST
Article-I.D.: sri-arpa.15989
Posted: Mon Jan 23 16:00:00 1984
Date-Received: Sun, 5-Feb-84 12:58:35 EST
Lines: 4

I like the scheme with multiple versions of arrays very much.  The
semantics are exactly those of copying on every update, except that
the implementation is "rooted" at the most recent version, so you
pay only for historical references.