Formalise external_source? #188
Description
Is your suggestion related to a problem to be solved?
The current suggested format is Databank:ID of data according to the latest euf-specs, but this is not enforced. The field value is free text.
A concise description of your feature request.
Is it feasible to impose a controlled vocabulary for Databank? e.g. BioProject or GEO. We could then validate the ID.