The editor model registry, which keeps track of different types of runtime ML Deformer models and their related editor models. When you create a new ML Deformer model type, you register it to this registry using the RegisterEditorModel method. You typically do this in your editor module's StartupModule method. And you unregister it again in the editor module's ShutdownModule method. Models can have priorities. The one model with the highest priority level will be the model that is created by default when creating a new ML Deformer asset.