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BEP016: diffusion derivatives
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DWI models: Force presence of "param" entity #99

Closed Lestropie closed 1 month ago

Lestropie commented 1 month ago

Closes #54.

Admittedly I've gone back and forth on this one. But following #92, I think the best solution is to just enforce that both model and param entities be present. This will also be much simpler from a schema / validator perspective. It may be unintuitive for some people who "just want to write a tensor", but on principle it makes sense to me, and hopefully if there's a bit of guidance then things will fall into place.