http://hl7.org/fhir/reference-version-rules|5.0.0

{
  "description" : "Whether a reference needs to be version specific or version independent, or whether either can be used.",
  "compose" : null,
  "package" : "hl7.fhir.r5.core@5.0.0",
  "date" : "2023-03-26T04:21:02Z",
  "meta" : {
    "lastUpdated" : "2023-03-26T15:21:02.749+11:00"
  },
  "publisher" : "HL7 (FHIR Project)",
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      "code" : "001",
      "system" : "http://unstats.un.org/unsd/methods/m49/m49.htm",
      "display" : "World"
    } ]
  } ],
  "content" : "complete",
  "name" : "ReferenceVersionRules",
  "experimental" : false,
  "resourceType" : "CodeSystem",
  "title" : "ReferenceVersionRules",
  "supliment" : null,
  "extension" : [ {
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
    "valueCode" : "fhir"
  }, {
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
    "valueCode" : "normative"
  }, {
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-normative-version",
    "valueCode" : "4.0.0"
  }, {
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
    "valueInteger" : 5
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  "status" : "active",
  "id" : "c0cc41b6-689a-5d65-b822-d761c17d415b",
  "valueSet" : "http://hl7.org/fhir/ValueSet/reference-version-rules",
  "url" : "http://hl7.org/fhir/reference-version-rules",
  "identifier" : [ {
    "value" : "urn:oid:2.16.840.1.113883.4.642.4.90",
    "system" : "urn:ietf:rfc:3986"
  } ],
  "concept" : [ {
    "code" : "either",
    "display" : "Either Specific or independent",
    "definition" : "The reference may be either version independent or version specific."
  }, {
    "code" : "independent",
    "display" : "Version independent",
    "definition" : "The reference must be version independent."
  }, {
    "code" : "specific",
    "display" : "Version Specific",
    "definition" : "The reference must be version specific."
  } ],
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}