From beringer@DB.Stanford.EDU Fri Jul 31 10:44:27 1998
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From: Dorothea Beringer <beringer@DB.Stanford.EDU>
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Good questions:

1) Megamodules are autonomous, but there can be suites of megamodules
(like the suite of transportation modules we have right now), that have
matching parameters.

2) If we want to compose megamodules that have different ontologies
(parameters that do not match), then we have a problem. Our approach to
that is the following:
- matching ontologies is outside the scope of the current CHAIMS
project, it is e.g. investigated in the SKC project
- for the time being, if we want to compose megamodules with parameter
mismatch, we (megamodule provider or CHAIMS system maintainer) have to
add mediator megamodules. These megamodules would make the necessary
transformations. 

Dorothea


Laurence Melloul wrote:
> 
> The SYNONYM thing is fine but in my previous mail, I thought this
> was very unlikely to happen since I thought megamodules were
> absolutely autonomous, but I guess I missed something there: they
> are not so autonomous since they can even deal with the same data.
> Is that right?
> 
> I still don't understand though why we do not care about the other
> case where megamodules are very unlikely to have similar structures
> one with the others. Are we postponing this? Do we have already an
> idea of how we are going to do direct data exchange between
> megamodules typewise?
> 
> Thanks,
> Laurence.
> 

-- 
Dorothea Beringer   Stanford University   beringer@db.stanford.edu 
          http://www-db.stanford.edu/people/beringer.html
--