Broken out from FHIR-42644:

We appreciate NDH's inclusion of IHE profiling and work in the mCSD profile and Topologies whitepaper in the section on discovery of endpoints: 3.6 Discovery a HIE Endpoint via the NDH.

The use case in NDH 3.6 currently shows how to use the IHE code HIEResponder in OrganizationAffiliation.code to reflect that an Organization is reachable through a given HIE, and OrganizationAffiliation.endpoint reflects dedicated endpoints to this Organization other members of the HIE can use if appropriate.

This ticket is to request the IHE codes DocShare-federate-in and DocShare-federate-ext as well, on OrganizationAffiliation.code. This supports discovering when an Organization is reachable electronically, but only indirectly, through the Endpoint of a related Organization. This is the case with numerous IHE profiles for federated SOAP APIs like XCPD and XCA.

The IHE profiling is available in full at https://profiles.ihe.net/ITI/papers/Topologies/index.html and this capability is walked with an example in section 5.1.8 Document Access: Putting it all together.