Main development tasks:

Domain Modeling:

• Domain Models encapsulate the static, data-centric facets of a problem domain using entity-relationship models. They form the foundation for persistence models implemented in databases and service definitions.
• CDS emphasizes conceptual modeling, aiming to capture intent rather than imperative implementations. This means focusing on “What” rather than “How”. This approach not only maintains the conciseness and comprehensibility of domain models but also enables the provision of optimized generic implementations.

Providing Services:

• In a CAP application, services are typically defined within CDS models and operated by CAP runtimes. Every functional element within CAP constitutes a service, encapsulating the behavioral dimensions of a domain through exposed entities, actions, and events.
• The CAP runtimes offer numerous generic implementations, which serve most requests automatically, with out-of-the-box solutions to recurring tasks such as search, pagination, or input validation – all generic features.
• As most standard tasks and use cases are covered by generic service providers, the remaining cases that need custom handlers, reduce to real custom logic, specific to your domain and application.

Consuming Services:

• If you want to use data from other services or you want to split your application into multiple microservices, you need a connection between those services. It’s called remote services. As everything in CAP is a service, remote services are modeled the same way as internal services — using CDS.
• As everything in CAP is a service, remote services are modeled the same way as internal services — using CDS.
• CAP supports service consumption with dedicated APIs to import service definitions, query remote services, mash up services, and work locally as much as possible.

Serving UIs:

• You can consume the provided services, for example, from UI frontends. CAP provides out-of-the-box support for SAP Fiori UIs, for example, with respect to SAP Fiori annotations and advanced features such as search, value helps and SAP Fiori Draft. If flexibility and total customization for the UIs are required, CAP also offers another support option with Fiori Freestyle.