description: This extension is used to provide a textual description of the randomization arm for trials (FLT). package_name: hl7.eu.fhir.pcsp derivation: constraint name: FltArm type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.eu/fhir/ig/pcsp/StructureDefinition/procedure-fltArm'} index: 1 value: choices: [valueString] index: 3 valueString: {type: string, choiceOf: value, index: 4} package_version: 0.1.0 extensions: {} class: extension kind: complex-type url: http://hl7.eu/fhir/ig/pcsp/StructureDefinition/procedure-fltArm base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.1.0