Hi Bogdan,

Don't forget to say whether you're asking about UML 1.4 or UML 2.1.1.  In
this case I don't think it makes a difference however.

> I searched for a default multiplicity of an association end 
> in the specification and didn't found any.

I believe that's true for UML 1.4 and I don't see anything that indicates
it's changed for UML 2.x.

> AFAIK, if the multiplicity is not defined then no conclusions 
> can be drawn from the UML model about it Or a default 
> multiplicity of 0..1 would be appropriate, or a multiplicity of 1..1.

I believe your first statement is more accurate.  One example where this
might be true is an incomplete model where a multiplicity hasn't been
specified yet.  In this case, the modeller (person) has intentionally left
it unspecified, so it would be inappropriate to draw a conclusion (or
enforce a default).

Tom

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