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Home -> Community -> Usenet -> comp.databases.theory -> Re: Relations as Repeating Groups & Namespaces
"Dawn M. Wolthuis" <dwolt_at_tincat-group.com> wrote in message news:c9prq0$2bt$1_at_news.netins.net...
> "x" <x-false_at_yahoo.com> wrote in message news:40c015b9_at_post.usenet.com...
> <snip> > > What namespaces have to do with nested relations ?> > > Within "this" namespace what are you permitted to name? The answer is
> > > > A nested relation is a nested "structure" not just nested names.
> > >
> >
> But why not have the SAME THINGS at all non-leaf levels? Why complicate
the
> matter? --dawn
Your use of words like "things" , "leaf" and "level" show me that you (pretend to ?) view the world as "things" classified in hierarhies. That is fine. Probably most humans have a similar view.
But each such hierarchy is only a point of view dependent on the observer
and the context.
There is a need to translate among several such "views".
One solution to this problem is the relational model.
Another problem is that the hierarchical view was lost in translation and we
need to write application to recover it.
And probably there are situations that cannot be modeled as hierarchies of
"things".
And probably there are humans that do not have a hierarchical view of the
world.
About complicating the matter:
What is more complicated:
- a nested list, a nested set
- several named flat lists or sets
Have you read about RM/T ?
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