description: Indicates the terminology server(s) that are known to be capable of returning and potentially expanding the value set(s) associated with the whole questionnaire or a particular group or question within the questionnaire (depending on where the extension appears).  If a full URL is not provided AND the requested query is a terminology operation (e.g. $lookup or $expand) the client SHOULD execute the operation against (one of) the preferredTerminologyServer(s) rather than the local repository.
package_name: hl7.fhir.uv.sdc.r4b
derivation: constraint
name: PreferredTerminologyServer
type: Extension
elements:
  url:
    type: uri
    pattern: {type: Uri, value: 'http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-preferredTerminologyServer'}
    index: 0
  value:
    choices: [valueUrl]
    index: 2
  valueUrl: {type: url, choiceOf: value, index: 3}
package_version: 3.0.0
class: extension
kind: complex-type
url: http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-preferredTerminologyServer
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 3.0.0