Is it possible to enumerate which ones are referred to as source_entities and then which entities are reserved for derivatives? So I would imagine a list of supported raw/source entities and then a running list of derivative entities?

E.g. desc from what I understand is only meant for derivatives, so it should never be present in a BIDS source dataset

@adam2392 We could add a field to the schema that describes scope, but I think that could quickly become confusing (e.g., space is raw for MEG/EEG/iEEG but derivatives-only for MRI). Would it be enough if I expanded the descriptions to clarify that they can only be used with Derivatives data?

@adam2392 We could add a field to the schema that describes scope, but I think that could quickly become confusing (e.g., space is raw for MEG/EEG/iEEG but derivatives-only for MRI). Would it be enough if I expanded the descriptions to clarify that they can only be used with Derivatives data?

Oh okay yeah that sounds good! I suppose that's a pretty simple fix for now and makes sense given what you said. Is desc the only Derivatives-only entity?

@tsalo @effigies unless you have final issues with this, I think one of you can merge this.