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[ATL] Why is the containment hierarchy of a target ecore model ignored? [message #491380]

Wed, 14 October 2009 12:06

Philipp Simon

Messages: 26
Registered: July 2009

Junior Member

Hi,

imagine two simple models:

m1:
ClassA<>--ClassB
m2:
ClassX<>--ClassY

we also have two rules stating that A maps to Y and B to X like:

rule AtoY{
from a: AB!A
to y: XY!Y ()
}
rule BtoX{
from b : AB!B
to x : XY!X ()
}

Then the output from the transformation is not compliant to the target metamodel since this will create Y elements not contained by corresponding X's.

Of course it is possible to specify a rule that respects the target model ( e.g. introducing dummies or multiple target patterns and setting the references along the way). Though to me this seems like something that should be resolved automatically. Is there a theoretical/design reason why ATL would not take care of this automatically?

Thanks,
Philipp

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