description: The FHIR type of a property - used on the value property of a primitive type (for which there is no type in the FHIR typing system), and Element.id, Resource.id, and Extension.url. All of these have a non-FHIR type in thir structure definition, and this specifies the applicable FHIR type. package_name: rs/hl7.fhir.r5.examples derivation: constraint name: fhir-type type: Extension elements: extension: {index: 0} url: pattern: {type: uri, value: 'http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type'} type: uri index: 1 value: choices: [valueUri] index: 3 valueUri: {type: uri, choiceOf: value, index: 4} package_version: 4.5.0 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type base: http://hl7.org/fhir/StructureDefinition/Extension version: 4.5.0 required: [value, valueUri]