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I understand we should using extension not over-layering in development.
However, is it a must to create new model? Can I develop under the standard Microsoft model using extension?
You can't add anything to the standard Microsoft packages / models. So yes, you must create your own package and model for your extensions.
The whole package is compiled to one DLL in the build process. You can't add anything that would change the standard DLLs. Instead your extensions must be built to another DLL that is installed alongside the standard ones.
You should use an own new model. It is not possible to use the Microsoft models as they have been locked and exist in a different application layer (which is still part of the AOT layering concept).
To further clarify, we would advise against creating a new package or model for EACH extension you're doing. Yes you need to create your own, BUT you want to minimize the amount of new packages/models you create and keep it simple.
If you're asking yourself, should I be using more than one package/model, the answer is probably no. When you have some sort of need to have multiple packages or models, you'll know :-)
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