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DevIQ is a reference site designed to help you learn about high-level software development topics like domain driven design, design patterns, and antipatterns.
Application services, on the other hand, are a great way to introduce a layered architecture. They can be used for mapping data inside the domain model to a shape required by a client application. For example, maybe you need to display tabular data in a DataGrid, but you want to maintain a granular and jagged object graph in your model.
ack -hc 'pattern'