description: A prefix value that is automatically prefixed to the value before it's validated (for use in logical models) package_name: hl7.fhir.uv.tools.r4 derivation: constraint name: ImpliedStringPrefix type: Extension elements: extension: {index: 0} url: pattern: {type: uri, value: 'http://hl7.org/fhir/tools/StructureDefinition/implied-string-prefix'} type: uri index: 1 value: choices: [valueString] index: 3 valueString: {type: string, choiceOf: value, index: 4} package_version: 0.7.1 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/tools/StructureDefinition/implied-string-prefix base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.7.1 required: [value, valueString]