description: This cross-version extension represents AllergyIntolerance.reaction.manifestation from http://hl7.org/fhir/StructureDefinition/AllergyIntolerance|4.3.0 for use in FHIR R5. package_name: hl7.fhir.uv.xver derivation: constraint name: Ext_R4B_AllergyIntolerance_re_manifestation type: Extension elements: url: base: {max: '1', min: 1, path: Extension.url} pattern: {type: Uri, value: 'http://hl7.org/fhir/4.3/StructureDefinition/extension-AllergyIntolerance.reaction.manifestation'} index: 0 value: base: {max: '1', min: 0, path: 'Extension.value[x]'} short: Clinical symptoms/signs associated with the Event choices: [valueCodeableConcept] index: 2 valueCodeableConcept: base: {max: '1', min: 0, path: 'Extension.value[x]'} type: CodeableConcept short: Clinical symptoms/signs associated with the Event choiceOf: value index: 3 package_version: r4b.r5-0.0.1-snapshot-2 class: extension kind: complex-type url: http://hl7.org/fhir/4.3/StructureDefinition/extension-AllergyIntolerance.reaction.manifestation base: http://hl7.org/fhir/StructureDefinition/Extension|5.0.0 version: 0.0.1-snapshot-2 required: [url]