description: Indicates the base type for a search parameter when the actual base type is not a valid resource (e.g. custom resource etc) package_name: hl7.fhir.uv.tools.r5 derivation: constraint name: SearchParameterBaseType type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.org/fhir/tools/StructureDefinition/searchparameter-base-type'} index: 1 value: choices: [valueCode] index: 3 valueCode: {type: code, choiceOf: value, index: 4} package_version: 0.4.0 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/tools/StructureDefinition/searchparameter-base-type base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.4.0 required: [valueCode, value]