description: Specifies the Identifier of the entity that is going to be using the Group Resource. package_name: hl7.fhir.us.davinci-atr derivation: constraint name: AtrIntendedRecipientIdentifierExtension type: Extension elements: url: type: uri pattern: {type: uri, value: 'http://hl7.org/fhir/us/davinci-atr/StructureDefinition/atr-intended-recipient-identifier-extension'} index: 0 value: choices: [valueIdentifier] index: 2 valueIdentifier: {type: Identifier, choiceOf: value, index: 3} package_version: 2.1.0 class: extension kind: complex-type url: http://hl7.org/fhir/us/davinci-atr/StructureDefinition/atr-intended-recipient-identifier-extension base: http://hl7.org/fhir/StructureDefinition/Extension version: 2.1.0 required: [value, valueIdentifier]