Sometimes it is not possible to use the ValueSet from the functional description on the corresponding FHIR element. This is a common occurence when the FHIR element has datatype code and has a required binding with an incompatible FHIR core ValueSet. It can also happen when the FHIR element has a string or other non-coded datatype.
In this case, the FHIR element may be augmented with this extension to communicate the code from the functional description. This information should always be added to the normal use of the FHIR element to allow for maximum interoperability.
Project FHIR API
This is the location where you can find your resource using a FHIR client.
Simplifier FHIR API
The global endpoint is where users can search for all resources in Simplifier. Resources have a globally unique guid Id here.