Am Samstag, 12. November 2005 20:00 schrieb Jean-Marc Orliaguet: > Helmut Merz wrote: > >Am Samstag, 12. November 2005 18:00 schrieb Jean-Marc Orliaguet: > >>My > >>impression is that you are thinking of a reference engine > >>rather than a relation engine > > > >Maybe I just don't see the difference... (There is one, of > >course, but I doubt it is really of relevance in a practical > >context. ) > > > >Helmut > > A relation contains several references: > > a relation between A, B and C involves 7 references: > > A with itself > B with itself > C with itself > A with B > B with C > C with A > A with B with C > > But a set of references don't make explicit relations, unless > the application know how to interpret the references.
OK - then I'm not talking about references, though we still mean different things when talking about 'relation': Mine goes like this: A relation object R providing ITriadicRelation and connecting A, B and C involves three references: R with A R with B R with C In addition the relation object has a sort of type, the 'relationship' (corresponding to a 'predicate') that may be specified by the relation's class or - a special case - a string. Maybe there is a better word for this kind of 'relation'? Helmut _______________________________________________ Zope3-dev mailing list Zope3-dev@zope.org Unsub: http://mail.zope.org/mailman/options/zope3-dev/archive%40mail-archive.com