Re: Ping: dawn, some mvl questions
Date: Sun, 21 May 2006 15:35:35 +0200
Message-ID: <44706bd0$0$31650$e4fe514c_at_news.xs4all.nl>
dawn wrote:
> mAsterdam wrote:
>
>>Kenneth Downs wrote: >> >>>... >>>I am in the school of thought that says that if you need a list, make a >>>table, that's what the RM is for. >> >>(Not about MV but sets/lists) >> >>I am in school of thought that says that if you see a list, it might >>be set that is meant. People often don't need to distinguish >>between them for day to day purposes,
>
> <snip>
>
> Not only that, but it is impossible to enumerate a set without the
> representation being a list. We write in lists, we speak in lists, and
> we are sometimes unaware of the meaning we give to a set when we list
> it. Does a grocery list refer to a set or would you lose something if
> you treated it that way?
Hm... I sound like a broken record. It depends on the context.
> Retaining the order of something represented as a list might just
> provide ongoing information never verbalized.
Yes. You can't tell from just looking at the content.
> If a user lists
> something in an order, but we have defined it as a set because there
> has been no overt statement of the meaning of the order, might be
> losing information?
Yes. OTOH, you might be adding misinformation be assuming the order relevant. My point was (and is):
You can't tell from just looking at the content. You'll have to investigate.
P.S.
Giving the scenario an unrealistic twist:
Say you and your partner share the shopping data using
a PDA-app where groceries are treated as a relation:
now you know the order in the representaion is irrelevant.
You don't have to guess, but you also have no guidance
from the order of the grocery-list.
Received on Sun May 21 2006 - 15:35:35 CEST