Introducing the Domain
The first section covered delivery mechanisms. A delivery mechanism exposes the application domain. The domain delivers an application business value. It contains the business logic, features, notifications and report generation for example. In short, applications are nothing without their domain. This guide identifies the use cases which implement functionality, entities which are the core classes in the application, forms for mapping input to domain objects, and persistence concerns. Consider it a primer on how to engineer domain objects separate from the bigger boundaries in your application.
First up, form objects.