Proposed Wording: Note that, unlike in many other specifications, there can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core simplicity for everyone.

Comment:

What does it take for an extension to be added to a resource. We are in DSTU2 and already have a lot of Patient and Observation extensions already. Should they be added to FHIR Normative 1? Are they forever extensions. Please explain if extensions are intended to permanent.