Fast Healthcare Interoperability Resources (FHIR, pronounced "fire") is a draft standard describing data formats and elements (known as "resources") and an application programming interface (API) for exchanging electronic health records
Starting a FHIR repository project with IRIS for Health, what are the pros and cons to use R5 instead of R4 ? What is the effort to migrate from R4 to R5 the FHIR repo ? What are the risks or disadvantages to use R5 ?