Re: c.d.theory glossary - RELATION

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"mAsterdam" <mAsterdam_at_vrijdag.org> wrote in message news:40927ce3$0$557$e4fe514c_at_news.xs4all.nl...
> >>"John likes Mary" would be in the body of a relation.
> >>It's predicate would be (short) "<Person> likes <Person>".
> >
> > Why we don't directly represent John in the database ?
>
> Because of the context we were discussing this in.
> We were discussing RM.RELATION vs ER.RELATION.
>
> AFAIK this (see previous post) is the way
> RM goes about representing facts, ER has no way
> of showing the facts in the body of a RM.RELATION,
> it only represents what would be in the heading.

Sorry. The text at:
 http://www.cs.sfu.ca/CC/354/zaiane/material/notes/Chapter2/node1.html made a distinction between:
- ENTITY and ENTITY SETs
- RELATIONSHIP and RELATIONSHIP SETs

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