Some model elements are not referenced by ID
Some elements in the serialized models are not referenced by their ID, but using a notation that is based on their position in the model, e.g.:
This is because the types of the referenced elements do not inherit from the
IIdlabeled and therefore do not provide an ID that could be referenced.
In this issue, it should be investigated if this is actually a problem. If so, all metaclasses should be changed to inherit from
IIdlabled (or at least those that are used as targets in references). If needed, also a migrator should be implemented, and all example projects should be updated.