Category Standard Organisation Health Level Seven (HL7) Type Standard Version 2 Access Open Status Active This standard describes the processes by which HL7 V3 artifact specifications may be refined, constrained and extended to support implementation designs, conformance profiles and realm-specific standards. Access HL7 Version 3 Standard: Refinement, Constraint, and Localization (RCL) to V3 Messages, R2 By accessing this content, you are leaving this website. The Agency takes no responsibility for the accuracy of content on the destination page.