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000024_rts _Thu Feb 25 11:48:24 1993.msg
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Received: from boojum.cs.arizona.edu by optima.cs.arizona.edu (5.65c/15) via SMTP
id AA15331; Thu, 25 Feb 1993 11:48:25 MST
Date: Thu, 25 Feb 1993 11:48:24 MST
From: "Rick Snodgrass" <rts>
Message-Id: <199302251848.AA28815@boojum.cs.arizona.edu>
Received: by boojum.cs.arizona.edu; Thu, 25 Feb 1993 11:48:24 MST
To: tsql@cs.arizona.edu
Subject: glossary
The definition of temporal element found in the glossary published in
SIGMOD Record contains the terms "time box" and "bitemporal
rectangle," which are undefined. I suggest the following changes.
1. Replace "finite union of n-dimensional time boxes" in the
definition of temporal element with "finite set of $n$-dimensional
chronons".
2. The definition of chronon be extended to allow $n$-dimensional
chronons. This could be accomplished by adding this sentence to the
definition of chronon:
"An $n$-dimensional chronon is a non-decomposable region
in $n$-dimensional time."
3. Replace "bitemporal rectangles" in the definition of temporal element
with "$n$-dimensional chronons".
-- Rick