The Application Services in this layer are the direct clients of the domain model, though themselves possessing no business logic. They remain very lightweight, coordinating operations performed against domain objects, such as Aggregates (10). They are the primary means of expressing use cases or user stories on the model. Hence, a common function of an Application Service is to accept parameters from the User Interface, use a Repository (12) to obtain an Aggregate instance, and then execute some command operation on it
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