Which layers are part of the ABAP RESTful application programming model?

The chosen answer, which highlights the Domain Model and Implementation, is central to the ABAP RESTful application programming model as it encapsulates the core design philosophy of building applications that are both structured and efficient. The Domain Model serves as a representation of business entities and their relationships, enabling a clear understanding of the application’s data structure. Implementation, on the other hand, involves the coding practices that bring the domain model to life, typically involving ABAP objects or classes and ensuring that the model is functional and aligns with the applications' requirements.

This layer stands out in the ABAP programming model because it fundamentally supports the creation, reading, updating, and deletion (CRUD) of data through defined services, while maintaining consistency and integrity of business logic. By focusing on these components, developers can create more maintainable and scalable applications that leverage the capabilities of the ABAP environment effectively.

Other components mentioned, such as CDS Annotations, Data Access, and Business Service Exposure, are indeed important in the context of an ABAP application, but they serve more as auxiliary or supportive layers that enhance or facilitate the core operations defined in the Domain Model and its Implementation. CDS Annotations help in enriching the data models with semantic information that can be utilized in user interfaces and other