description: This cross-version extension represents Evidence.citeAs[x] from http://hl7.org/fhir/StructureDefinition/Evidence|4.3.0 for use in FHIR R4. package_name: hl7.fhir.uv.xver-r4b.r4 derivation: constraint name: ext_R4B_Evidence_citeAs type: Extension elements: value: base: {path: 'Extension.value[x]'} short: Citation for this evidence choices: [valueReference, valueMarkdown] index: 1 valueReference: short: Citation for this evidence refers: ['http://hl7.org/fhir/StructureDefinition/Citation'] type: Reference base: {path: 'Extension.value[x]'} choiceOf: value index: 2 valueMarkdown: base: {path: 'Extension.value[x]'} type: markdown short: Citation for this evidence choiceOf: value index: 3 url: pattern: {type: uri, value: 'http://hl7.org/fhir/4.3/StructureDefinition/extension-Evidence.citeAs'} type: uri index: 4 package_version: 0.0.1-snapshot-1 class: extension kind: complex-type url: http://hl7.org/fhir/4.3/StructureDefinition/extension-Evidence.citeAs base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.0.1-snapshot-1 required: [url]