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

An expression (FHIRPath, CQL or FHIR Query) that resolves to a list of permitted answers for the question item or that establishes context for a group item. The user may select from among the list to choose answers for the question.