description: Indicates when this resource ID was first associated with content on this server. package_name: hl7.fhir.uv.extensions derivation: constraint name: FirstCreated type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/firstCreated'} index: 1 value: choices: [valueInstant] index: 3 valueInstant: {type: instant, choiceOf: value, index: 4} package_version: 1.0.0 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/firstCreated base: http://hl7.org/fhir/StructureDefinition/Extension version: 1.0.0 required: [valueInstant, value]