http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-lookupQuestionnaire|4.0.0-ballot

For items of type reference, the reference can be populated either by picking an existing entity or by creating a new one. In the latter case, this Questionnaire allows specifying the Questionnaire to use in creating the target instance. Typically this will result in a QuestionnaireResponse that can be [extracted](extraction.html) to produce the desired resource. However, if the target resource for the reference is a QuestionnaireResponse, then the QuestionnaireResponse resulting from the Questionnaire can be referenced directly.