Oxygen XML Framework offering support for editing and validating HL7® FHIR® documents.
Supported versions of FHIR: DSTU2 version 1.0.2, STU3 version 3.0.2, R4 version 4.0.1, R4B version 4.3.0
For installation, go to the Oxygen main menu "Help->Install new add-ons" and paste this URL: https://raw.githubusercontent.com/raducoravu/hl7-framework/master/addon.xml