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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
 =?utf-8?Q?=29?=
 <yannick_duchene@yahoo.fr>
Newsgroups: comp.lang.ada
Subject: Ada and UML
Date: Tue, 31 Aug 2010 12:12:43 +0200
Organization: Ada @ Home
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Date: 2010-08-31T12:12:43+02:00
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Hi all,

A few days ago I get to have a look back at UML after a topic linking to=
  =

an assessment stating graphical representations may help in  =

design/application validation. Someone argued there is a lack of semanti=
c  =

with UML which dismiss its usage ; one topic I agree on, and after some =
 =

reading to be sure, it seems indeed, there does not have a clearly defin=
ed  =

semantic (*)

Another topic I oftenly read/heard about Ada and UML, is that it is too =
 =

much oriented toward Java/C++, lacking as an example, handling of class =
 =

and package orthogonality which is typical of Ada.

I've just discovered today it seems there is a kind of package visibilit=
y  =

with UML expression of classes, which could match Ada concept of package=
:  =

the visibility modifier =E2=80=9C~=E2=80=9D (the Tilde sign) which seems=
 to means =E2=80=9CPrivate  =

at package level=E2=80=9D. This should be sufficient for Ada. Neverthele=
ss, there  =

is nothing like =E2=80=9Cfriend=E2=80=9D or =E2=80=9Cprotected=E2=80=9D =
in Ada, as visibility is only  =

handled by packages, so this visibility modifiers could just be  =

disallowed. Do you think =E2=80=9C~=E2=80=9D is OK to express visibility=
 handled by  =

packages ?

For you who tried Ada and UML, did you noticed some others unsolvable  =

matters to express Ada package in UML ?


(*) TBH, some peoples with interests in UML was aware of that, started  =

some research on 1997 to draw a formal definition of the UML semantic, b=
ut  =

any research in that area seemed to end on 2004, without any successful =
 =

completion.

P.S. As the purpose of UML is clearly underspecification, may be the  =

question of this thread does not really matters, as Ada is acting at  =

implementation level.