description: This cross-version extension represents SearchParameter.base from http://hl7.org/fhir/StructureDefinition/SearchParameter|1.0.2 for use in FHIR R5. package_name: hl7.fhir.uv.xver-r2.r5 derivation: constraint name: Ext_R2_SearchParameter_base type: Extension elements: url: base: {max: '1', min: 1, path: Extension.url} pattern: {type: Uri, value: 'http://hl7.org/fhir/1.0/StructureDefinition/extension-SearchParameter.base'} index: 0 value: base: {max: '1', min: 0, path: 'Extension.value[x]'} short: The resource type this search parameter applies to choices: [valueCode] index: 2 valueCode: base: {max: '1', min: 0, path: 'Extension.value[x]'} type: code short: The resource type this search parameter applies to choiceOf: value index: 3 package_version: 0.0.1-snapshot-2 class: extension kind: complex-type url: http://hl7.org/fhir/1.0/StructureDefinition/extension-SearchParameter.base base: http://hl7.org/fhir/StructureDefinition/Extension|5.0.0 version: 0.0.1-snapshot-2 required: [url]