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000012_gadia@cs.iastate.edu _Tue Sep 14 14:36:17 1993.msg
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Message-Id: <199309141936.AA11308@optima.CS.Arizona.EDU>
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id AA11308; Tue, 14 Sep 1993 12:36:27 MST
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(1.37.109.6/16.2) id AA15240; Tue, 14 Sep 93 14:36:17 -0500
From: Shashi K. Gadia <gadia@cs.iastate.edu>
Subject: Ahn's message on temporal element
To: ahn@cbnmva.att.com
Date: Tue, 14 Sep 93 14:36:17 CDT
Cc: tdbglossary@cs.arizona.edu
In-Reply-To: <199309102029.AA03984@univers.cs.arizona.edu>; from "ahn@cbnmva.att.com" at Sep 10, 93 1:29 pm
Mailer: Elm [revision: 70.85]
Hi everyone:
I am responding to Ahn's message about
temporal element.
> P2: Temporal Element (Section 3.15)
> problem: This term is not intuitive, in fact counter-intuitive,
> for representing a union of time intervals.
> It sounds like an elementary item, e.g.
> a single timestamp or a chronon.
> Besides, \part{Previously Used Names} mentions
> the same term again.
> replacing term:
> "Multi-intervals" or "Interval sets" or simply "Intervals"
> I personally prefer "Multi-intervals", but anything
> would be better than "temporal element".
>
A temporal element in one dimension is
a union but NOT a set of intervals.
The terms "Multi-intervals" or "Interval sets"
or simply "Intervals" lean towards a set and
not union.
The term temporal element is more generic.
In the bitemporal model, it is union of rectangles.
Moreover if your bitemporal space does not contain
notion of future the bitemporal space reduces
to triangle below the diagonal. And a temporal
element becomes union of triangles and rectangles.
(See Section 6.2 on page P-26 of workshop
proceedings.)
The term temporal element generalizes to spatial
or spatio-temporal element. A spatio temporal
element can be very complex.
Regards
Shashi