I am taking cue from Jeffrey Palermo’s Onion Architecture. It is designed with the premise that infrastructure changes over time and so should be external to the application’s core.
I may even organize my ProtoStack / Orchestra ERP namespaces into something like DomainModel, DomainServices, ApplicationServices.
Also, I am considering a process where data layer integration is developed later in the project. I’ll start with building the core, interfacing with a fake data layer (all in-memory typed collections) followed by the UI.

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