http://hl7.org/fhir/StructureDefinition/questionnaire-referenceProfile|4.0.1

Where the type for a question is \"Reference\", indicates a profile that the resource instances pointed to in answers to this question must be valid against.
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/canonical
Extension.value[x].targetProfilehttp://hl7.org/fhir/StructureDefinition/StructureDefinition