Constraints question

[thomaskilian]

If I have two constraints and want to attach them to an association: how can I distinguish between
a) AND
b) OR
c) XOR
Any hint appreciated.

[«Midnight»]

I don't quite know what you mean Thomas. Are you speaking of something along the lines of an XOR constraint between two connectors?

I remember doing this with EA back a year and change. The way to do it was not quite what I expected - not that it didn't make sense, but I tried all kinds of subtle (as in "dumb, but unwise nontheless") things first. In the end the results were quite satisfactory, all things considered.

Of course, now I cannot remember how I did it.

Hint: EA models these as a note. There's something like a "constraint note" in one of the dialogs; once you see that you are home free.

While the result is not exactly the {XOR} notation you see in some OMG stuff, it still works out well. You can size the resulting note graphic to make it smaller.

David

[jeshaw2]

If I have two constraints and want to attach them to an association: how can I distinguish between
a) AND
b) OR
c) XOR
Any hint appreciated.

If you are talking about one association with two constraints, I would think you would use Object Constraint Language OCL in the constraints box in the association's properties.

[thomaskilian]

Thanks for that guys. I'll have to read about OCL then.