Re: Nested Groupings

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From: Garry Petrie (gp_at_europa.com)
Date: Thu Feb 08 2001 - 07:27:14 CET 

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Date: Wed, 07 Feb 2001 22:27:14 -0800
From: Garry Petrie <gp_at_europa.com>
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Subject: Re: Nested Groupings
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Paul & Eleanor wrote:

> Garry Petrie wrote:
>
>> For the gourpings advocates, show me a method that does not repeat
>> data, but allows the objects to be members of more than one group.
>
> In the following assume all shots listed as "..." are unique measurements
> with no repeats. Any interesting additional attributes on
> the group tag (i.e type) I have left for clarity.
>
> I. Nested groupings
>
> <group name="Upper Cave">
> <group name="Entrance Room">
> ... <!-- in Upper cave and in the Entrance --!>
> </group>
> ... <!-- in Upper cave but not in the Entrance --!>
> </group>
> ... <!-- somewhere else --!>
>
> I hope the above examples make it obvious enough that data doesn't
> have to be repeated to allow the ability to slap some simple
> categorization over the shots.

What Paul is suggest is optionally allowing for "horizontal" or "vertial" representations
of the data. In all of the shots in the "Upper cave and in the Entrance" group, the shots
would have to have additional information as to who recorded the shots, what were the
instraments, etc. Personally, I find this sorting un-natural, as it assumes you already
know the physical relationships of the the data before it is recorded.

Again, the example Paul gives is for mutually exclusive groupings, sorted by physical
location. Now, show me how to group by time in the same file.

Garry Petrie

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