Question: are metamodels used in serialization implicit?

[ftomassetti]

If I look at this file it is specifying nodes with types such as LIonCore_M3_Metamodel or LIonCore_M3_PrimitiveType. In general, should we declare with metamodels are we using? Is LionCore itself a special implicit metamodel and others should be declared?
I think it would be useful to know which metamodels are used by reading an header, so I could either reject the model, if I do not know how to handle that metamodel, or do initialization steps to load such metamodel

[dslmeinte]

No, this is going to be explicit, as in PR #29 - see e.g. this file location. (Feel free to review that PR.)

[enikao]

Relates to LionWeb-io/specification#50

[dslmeinte]

To align with LionWeb-io/specification#9 (comment) : built-in primitive types are imported implicitly, without needing to depend explicitly through Metamodel.dependsOn.

[dslmeinte]

fixed through commit 65d86a6

[enikao]

Did you discuss whether we want to list used metamodels explicitly in serialization? E.g. in a serialized M1 model, do we explicitly list all M2 metamodels referred to by concept, properties, children, references, etc?

[dslmeinte]

No, we didn't discuss it. I think we interpreted dependsOn similar to a model import. I think a dependsOn that points to specific metamodels (of languages) should maybe go in a separate feature, such as conformsTo?

[enikao]

Good idea: LionWeb-io/specification#76