The Domain layer
So let's start with the Domain layer. The 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. You can look at the following order processing domain model diagram to get a quick idea about the domain model.
A sample domain model
Each block in the previous diagram represents a business entity and the lines represent the associations between the entities. Based on this domain ...
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