description: This Extension profile represents a reference to a ValueSet that establishes a required binding to the allowable values for a code system property. package_name: hl7.fhir.us.ph-library derivation: constraint name: USPublicHealthCodeSystemPropertyRequiredBindingExtension type: Extension elements: extension: {index: 0} url: pattern: {type: uri, value: 'http://hl7.org/fhir/us/ph-library/StructureDefinition/us-ph-codesystem-property-required-binding-extension'} type: uri index: 1 value: choices: [valueCanonical] index: 3 valueCanonical: {type: canonical, choiceOf: value, index: 4} package_version: 2.0.0-ballot extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/us/ph-library/StructureDefinition/us-ph-codesystem-property-required-binding-extension base: http://hl7.org/fhir/StructureDefinition/Extension version: 2.0.0-ballot required: [value, valueCanonical]