description: The anatomical location / body site(s) where the symptoms manifested. package_name: ch.fhir.ig.ch-allergyintolerance derivation: constraint name: AllergyIntoleranceLocation type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/openEHR-location'} index: 1 value: choices: [valueCodeableConcept] index: 3 valueCodeableConcept: {type: CodeableConcept, choiceOf: value, index: 4} package_version: 0.2.0 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/openEHR-location base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.2.0 required: [value, valueCodeableConcept]