<status value="active"/> <experimental value="false"/> <date value="2021-03-11T17:06:20+11:00"/> <publisher value="HL7 (FHIR Project)"/> <contact> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> <telecom> <system value="email"/> <value value="fhir@lists.hl7.org"/> </telecom> </contact> <description value="Whether a reference needs to be version specific or version independent, or whether either can be used."/> <caseSensitive value="true"/> <valueSet value="http://hl7.org/fhir/ValueSet/reference-version-rules"/> <content value="complete"/> <concept> <code value="either"/> <display value="Either Specific or independent"/> <definition value="The reference may be either version independent or version specific."/> </concept> <concept> <code value="independent"/> <display value="Version independent"/> <definition value="The reference must be version independent."/> </concept> <concept> <code value="specific"/> <display value="Version Specific"/> <definition value="The reference must be version specific."/> </concept> </CodeSystem>

This code system http://hl7.org/fhir/reference-version-rules defines the following codes:

Code	Display	Definition
either	Either Specific or independent	The reference may be either version independent or version specific.
independent	Version independent	The reference must be version independent.
specific	Version Specific	The reference must be version specific.