description: The Extension profile allows indicating that an input to a parent action is an input to specific child actions. It also allows the output of one action to be identified as the input to a different action. package_name: hl7.fhir.us.ph-library derivation: constraint name: USPublicHealthRelatedDataExtension type: Extension elements: extension: {index: 0} url: pattern: {type: uri, value: 'http://hl7.org/fhir/us/ph-library/StructureDefinition/us-ph-relateddata-extension'} type: uri index: 1 value: short: The ID of the input or output element that provides data to this input or results as output. choices: [valueString] index: 3 valueString: {type: string, short: The ID of the input or output element that provides data to this input or results as output., 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-relateddata-extension base: http://hl7.org/fhir/StructureDefinition/Extension version: 2.0.0-ballot required: [value, valueString]