description: The URL pointing to an externally maintained protocol, guideline, orderset or other definition that is adhered to in whole or in part by the event or request resource. package_name: hl7.fhir.r5.core derivation: constraint name: instantiatesUri type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/workflow-instantiatesUri'} 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/workflow-instantiatesUri base: http://hl7.org/fhir/StructureDefinition/Extension version: 4.5.0 required: [valueUri, value]