description: Identifies a filter to apply when looking up candidate answers for the question.  **This extension has been replaced by the Structured Data Capture candidateExpression extension.**
package_name: hl7.fhir.r5.examples
derivation: constraint
name: referenceFilter
type: Extension
elements:
  extension: {index: 0}
  url:
    pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/questionnaire-referenceFilter'}
    index: 1
  value:
    choices: [valueString]
    index: 3
  valueString: {type: string, choiceOf: value, index: 4}
package_version: 5.0.0-snapshot3
extensions: {}
class: extension
kind: complex-type
url: http://hl7.org/fhir/StructureDefinition/questionnaire-referenceFilter
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 5.0.0-snapshot3
required: [valueString, value]