design question: no new attributes

[Alan Isaac]

"Bruno Desthuilliers" <bdesth.quelquechose at free.quelquepart.fr> wrote in
message news:45e60fdc$0$30655$426a34cc at news.free.fr...
> I don't share your definition of "reasonable". But you should have
> guessed by now

My view may be shaped by a different experience.
I have found dynamic attribute creation convenient
when doing something "quick and dirty", but I have
never wanted it as a design feature in a more serious
project.

Can you give me an example where design considerations
make dynamic attribute creation particularly desirable?

Thank you,
Alan Isaac