http://hl7.org/fhir/StructureDefinition/questionnaire-referenceFilter|5.2.0

Identifies a filter to apply when looking up candidate answers for the question. DEPRECATED: This extension has been replaced by the Structured Data Capture candidateExpression extension.
element_idtypes
Extension
Extension.extension
Extension.url
Extension.value[x]
Extension
Extension.id
Extension.extension
Extension.url
Extension.value[x]