Re: Multiplicity, Change and MV
Date: Tue, 18 Apr 2006 16:44:43 +0300
"dawn" <dawnwolthuis_at_gmail.com> wrote in message
> x wrote:
> > "dawn" <dawnwolthuis_at_gmail.com> wrote in message
> > news:1145292548.823950.44180_at_u72g2000cwu.googlegroups.com...
> > >
> > It just occured to me that other possible problem with MV systems beside
> > loops might be the [im]possibility to represent relations over the same
> > domain like r(A,A,A,A) where A is an element/entity/whatever like
> > Lecturers etc.
> > Could you provide an example for this ?
> The domain for every (non-binary) attribute in Pick is String.
> Everything else, such as indicating that the string is a Date, is a
> description of the data. A single value can be described as a Date and
> as a String, for example. There is no problem having a relation with
> multiple courses. Each course would be named differently and would be
> a String.
String is not an entity of the domain of discourse. I would like a detailed example as the one provided by B Faux. I can wait, so no hurry :-) Received on Tue Apr 18 2006 - 15:44:43 CEST