description: The contextId is intended to be used for 'non-standard' identifiers provided as part of the $risk-gap operation API call, for example, some systems may have an internally defined gap-request-id. package_name: hl7.fhir.us.davinci-ra derivation: constraint name: ContextId type: Extension elements: url: type: uri pattern: {type: Uri, value: 'http://hl7.org/fhir/us/davinci-ra/StructureDefinition/ra-contextId'} index: 0 valueId: {type: id, index: 1} package_version: 3.0.0-ballot class: extension kind: complex-type url: http://hl7.org/fhir/us/davinci-ra/StructureDefinition/ra-contextId base: http://hl7.org/fhir/StructureDefinition/Extension version: 3.0.0-ballot