quested action on a Resource.  Purpose of use 
should be conveyed using standard codes from <a href="https://terminology.hl7.org/ValueSet-v3-PurposeOfUse.html">Purpose of Use Vocabulary</a>.
</p><p>
The FHIR core specification does not include a "User" resource, as a User resource would be general IT and used well
beyond healthcare workflows. A RESTful User resource is defined in 
the <a href="https://en.wikipedia.org/wiki/System_for_Cross-domain_Identity_Management">System for Cross-domain Identity Managem