> -----Original Message-----
> From: [EMAIL PROTECTED] [SMTP:[EMAIL PROTECTED]]
> Sent: Thursday, May 16, 2002 9:10 AM
> To: Tony Semana
> Cc: '[EMAIL PROTECTED]'
> Subject: Re: (ROSE) Association Classes
>
>
> (responding to Tony Semana)
>
> > I apologize if this is a stupid question, but is this acceptable in
> > UML and Rose / Visio?
>
> No, it's a sensible question that sensible folk have been asking
> of Rose for several years. UML allows n-ary associations but
> Rose won't draw them. (Surely Visio can?)
>
> > I have 1 class (ItemCode) that I need to communicate (in a class
> > diagram) is an Association Class between 3 other business
> > concepts (the Fund, the Currency, and the SettlementType).
> > This ItemCode cannot be derived without knowing all of the
> > three pieces, how do represent this association?
>
> I assume that's what you really want to model. The name of the
> class 'ItemCode' doesn't seem to represent a 'real world' concept,
> so is always worth a second look. But let's assume there's a real need...
>
> Any ternary association can be represented by 3 binary associations
> if absolutely necessary. I always choose to add dependency arrows
> between these in an attempt to show they are interdependent.
>
> However, one can't persuade Rose to have a single class as
> Association Class for all three interdependent binary relationships.
> (i.e. for all parts of the ternary relationship).
>
> The best work around I have for this is is to give one relationship
> an association class, and indicate that this relationship is
> dependent on the other two.
>
> If anyone has a better proposal I'd be interested.
>
Another trick we've used with Rose in the past:
Make ItemCode a standalone class, with associations to all three
other parties (many on the ItemCode end and 1 on the Fund, etc. ends). This
almost captures the intention for the eagle-eyed model readers. To make the
intention absolutely clear to all, stereotype the ItemCode class as
<<Ternary>>.
I'll bet someone has a Ternary class icon file that they can share
with us, if it hasn't already been included with Rose.
Regards,
H�seyin Angay
Karabash Ltd.
www.karabash.co.uk
> <snip>
>
> Paul Oldfield
>
> any opinions expressed herein are not necessarily those of
> Mentors of Cally
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