Clarify that two different NCPI Participants (with two different ID) within the same study should be two different person

[mingward]

What were you reviewing?

In NCPI Participant profile:
https://nih-ncpi.github.io/ncpi-fhir-ig-2/StructureDefinition-ncpi-participant.html#profile

Is it true that ""two different NCPI Participants (with two different ID) within the same study should be two different individual"?
If so, how about adding this to the "id" description below so it is clear?

Currently it says "ParticipantID - Unique participant identifier". We think adding above will make the participant ID semantically unique within the same study. Thoughts? Thank you!

Relevant Link:

https://nih-ncpi.github.io/ncpi-fhir-ig-2/StructureDefinition-ncpi-participant.html#profile

[RobertJCarroll]

I'm not following where this change should be- it sounds like you are suggesting in the ID description, but I don't think that's appropriate as it's really a constraint on the entity. The ID is already stated to be unique.

To address this, I recommend we ensure that the descriptions for the resources are clear, minimally starting with including the details from the logical model. We could then supplement with more of these constraints if the language isn't clear enough for that point.