description: 'Numeric level in the hierarchical value-set. As an example, this extension is used to distinguished between Test Category | Test Subcategory in Quality Specifications. Test Category is level 1 and Test Subcategory is level two. A constraint enforces values greater than zero. ' package_name: hl7.fhir.us.pq derivation: constraint name: HierarchicalLevelExtension type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.org/fhir/us/pq-cmc-fda/StructureDefinition/pq-hierarchical-level-extension'} index: 1 value: short: TestCategory Level mustSupport: true choices: [valuePositiveInt] index: 3 valuePositiveInt: {type: positiveInt, short: TestCategory Level, mustSupport: true, choiceOf: value, index: 4} package_version: cmc-fda-1.0.0 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/us/pq-cmc-fda/StructureDefinition/pq-hierarchical-level-extension base: http://hl7.org/fhir/StructureDefinition/Extension version: 1.0.0 required: [valuePositiveInt, value]