What can be defined in the domain model of a Mendix application?

The domain model in a Mendix application is primarily used to define the structure and relationships of data within the application. This includes specifying entities, which represent data objects, and the attributes of those entities which define their characteristics. Additionally, the domain model allows for defining data validations to enforce the integrity and correctness of the data being handled. Relationships between entities can also be established, indicating how different data objects relate to one another within the application.

These features enable developers to create a solid foundation for data management in the application, ensuring that all relevant interactions and constraints are properly defined. By focusing on these aspects, the domain model becomes a critical part of efficient application design, ensuring that data flows logically and consistently throughout the application.