description: Indicates whether the list of supported units (conveyed in other extensions) are the exhaustive list from which the user must choose or whether they're able to select alternate codes or specify a string.
package_name: hl7.fhir.uv.sdc
derivation: constraint
name: UnitOpen
type: Extension
elements:
  url:
    type: uri
    pattern: {type: Uri, value: 'http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-unitOpen'}
    index: 0
  value:
    choices: [valueCode]
    index: 2
  valueCode: {type: code, choiceOf: value, index: 3}
package_version: 3.0.0-preview
class: extension
kind: complex-type
url: http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-unitOpen
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 3.0.0-preview
required: [valueCode, value]