| variable | http://hl7.org/fhir/StructureDefinition/variable |
| enableWhenExpression | http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-enableWhenExpression |
| itemPopulationContext | http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-itemPopulationContext |
| rendering-style | http://hl7.org/fhir/extensions/StructureDefinition-rendering-style.html |
| rendering-xhtml | http://hl7.org/fhir/StructureDefinition/rendering-xhtml |
| hidden | http://hl7.org/fhir/StructureDefinition/questionnaire-hidden |
| collapsible | https://hl7.org/fhir/uv/sdc/StructureDefinition-sdc-questionnaire-collapsible.html |
| required | item.required |
| itemControl | http://hl7.org/fhir/StructureDefinition/questionnaire-itemControl Supports: - gtable - grid - page - tab-container |
| shortText | http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-shortText |
| repeats | item.repeats - Results in a repeat group |
| readOnly | item.readOnly - Applies readOnly on all items in the group |
| preferredTerminologyServer | http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-preferredTerminologyServer - Applies preferredTerminologyServer to all child items recursively |
| enableWhen | item.enableWhen |
| enableBehavior | item.enableBehavior |
| text | item.text |