[EVL] Execute constraint check only once (per model)

Hi All,
I have been working with Epsilon for a few days now and I love the tool so far
I am currently working on a model validation but I cannot find an elegant way to perform a certain check only once for the entire model. The casus/Meta-Model is very simple. I have a Node that has 0..* references to itself. The idea is to have a very simple tree where nodes have a reference to their parent.
What I want to check is that there is one and only one root node, so only one node without a reference. This results in the following check: AT!ATNode.allInstances.select(n|n.Parents.size() == 0).size() = 1
I do not know where to perform this check however. If I perform it in the context of the node, it (correctly) returns an error, but does this for every node.
I also tried to have the entire model as 'context' or to apply the check in a pre-condition, but could not get any of these approaches to work. I also could not find a suitable guard to put on the constraint.
Can you help me find a more elegant solution?
Greetings,
David

Hi David,
Quote:an elegant way to perform a certain check only once for the entire model
May be you could model the "entire model" ... I mean, it's a kind of a good practice to create a ModelRoot class containing all your nodes. [A better name could be "Tree" or another appropriate name according to your domain]
Then your validation wizard, with the exactly same expression, could be set on this class, a.ka. the "entire model" ?
Furthermore, you could also ensure the root unicity by setting proper cardinalities in the metamodel, and avoid writing a check.
I even met a special case where I had to model explicitely the RootNode as a class => A tree contains one root node which itself contains nodes ...
Cheers,
--Eric

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[EVL] Execute constraint check only once (per model)

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