cdisc-org / cdisc-org/DDF-RA

Shouldn't it be possible to use a BiomedicalConceptSurrogate in any place where a BiomedicalConcept can be used?

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Description

At the moment (release 3.10), a BC surrogate cannot be included in a BC category because there is no `members` relationship between `BiomedicalConceptCategory` and `BiomedicalConceptSurrogate`.

If a BC surrogate is just a BC that has not yet been officially defined/released, it might be better to represent `BiomedicalConcept` and `BiomedicalConceptSurrogate` as specializations of the same general class, with relationships to/from the general class indicating where either a BC or a BC surrogate might be used. The only difference between a `BiomedicalConcept` and a `BiomedicalConceptSurrogate` would be the attributes/relationships that are part of the officially defined/released BC:

![Image](https://github.com/user-attachments/assets/c200bc5f-77fb-4927-8cb2-e13c25a4c4bd)

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