The domain layer
Let's start with the domain layer. A domain layer typically consists of a domain model. So, what is a domain model? A domain model is a representation of the data storage types required by the business logic. It describes the various domain objects (entities); their attributes, roles, and relationships; plus the constraints that govern the problem domain. Take a look at the following domain model diagram for order processing to get a quick idea about the domain model:
Sample domain model
Each block in the preceding diagram represents a business entity, and the lines represent the associations between the entities. Based on the preceding ...
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