navigable vs. exposed by reference



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From: SainTiss (saintiss@arklinux.org)
Date: Mon 26 Jan 2004 - 15:01:40 GMT


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Hi,

if I understand correctly, there is a difference in the UML metamodel between 
a navigable associationEnd, and one which is exposed by a reference. Does 
this difference exist at the modeling level already, or only at code level 
(e.g. JMI interfaces)?
I looked at the UML standard, but couldn't find anything about it... As far as 
I can see, all associations in the UML metamodel can be navigated 
bidirectionally and so I assume that they are also exposed by a reference at 
both ends.

Is this correct? If not, are OCL constraints allowed to use non-exposed 
association-ends, and is this documented somewhere?

Thanks in advance,

Hans Schippers


- -- 
Ark Linux - Linux for the Masses (http://arklinux.org)

Capitalism: 
You don't have any cows. The bank will not lend you money to buy cows, 
because you don't have any cows to put up as collateral.

Representative Democracy:
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In a world without walls and fences, who needs windows and gates?

Hans Schippers
2LIC INF
UA 2003-2004
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