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From: "x" <x@not-exists.org>
Newsgroups: comp.databases.theory
Subject: Re: repeating groups
Date: Mon, 20 Feb 2006 12:25:38 +0200
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"x" <x@not-exists.org> wrote in message news:dtc57o$qc6$1@nntp.aioe.org...
>
> "Jon Heggland" <heggland@idi.ntnu.no> wrote in message
> news:MPG.1e638df9eab10b65989767@news.ntnu.no...
>
> > Can anybody please take half a minute to explain to a poor ignoramus why
> > list attributes affects the (relational, I assume(?)) algebra? It seems
> > to be taken for granted around here, but I can't figure out how/why.
> > What am I missing?

sorry about
> {s(x,y):LxL/ r(u) and u=[*,x,y,*]} with L is list of D and r(L)
It should be
{s(x,y):DxD/ r(u) and u=[*,x,y,*]} with L is list of D and r(L)
or
{s(x,y):LxL/ r(u) and u=[*,x,y,*]} with L is list of lists of ...(trees) and
r(L)