description: Specifies the version of the base definition that was used when the snapshot was generated package_name: hl7.fhir.uv.tools.r5 derivation: constraint name: SnapshotBaseVersion type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.org/fhir/tools/StructureDefinition/snapshot-base-version'} index: 1 value: choices: [valueString] index: 3 valueString: {type: string, choiceOf: value, index: 4} package_version: 0.4.0 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/tools/StructureDefinition/snapshot-base-version base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.4.0 required: [valueString, value]