description: Unique identifier for a study protocol. package_name: nictiz.fhir.nl.stu3.questionnaires derivation: constraint name: studyprotocolIdentifier type: Extension elements: extension: {index: 0} url: type: uri pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/questionnaire-studyprotocolIdentifier'} index: 1 valueIdentifier: {type: Identifier, index: 2} package_version: 0.0.1-beta1 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/questionnaire-studyprotocolIdentifier base: http://hl7.org/fhir/StructureDefinition/Extension version: null