Cross model references can be added between models without any explicit dependency between projects in a regular UML model. For example, if two models are open, you can drag classes from one model onto a class diagram from another model and then draw relationships between classes. However, doing this does not invoke code generation of the dependent model to resolve code-level dependencies when the current UML development model is built.
In order to resolve code-level dependencies, you must first create project references so that the builder can track dependencies and pre-build dependent projects. In addition, you create references, or references are created automatically for you, from a dependent transformation configuration to a required transformation configuration in the referenced project. The transformation configurations then manage the dependencies among the target domain language projects.
For example, when a transformation is run, either manually by you or during a project build, the following operations happen: