| id | String | No description |
| extension | [Extension] | No description |
| modifierExtension | [Extension] | No description |
| linkId | String | No description |
| _linkId | ElementBase | No description |
| definition | uri | No description |
| _definition | ElementBase | No description |
| code | [Coding] | No description |
| prefix | String | No description |
| _prefix | ElementBase | No description |
| text | String | No description |
| _text | ElementBase | No description |
| type | code | No description |
| _type | ElementBase | No description |
| enableWhen | [QuestionnaireItemEnableWhen] | No description |
| enableBehavior | code | No description |
| _enableBehavior | ElementBase | No description |
| required | Boolean | No description |
| _required | ElementBase | No description |
| repeats | Boolean | No description |
| _repeats | ElementBase | No description |
| readOnly | Boolean | No description |
| _readOnly | ElementBase | No description |
| maxLength | Int | No description |
| _maxLength | ElementBase | No description |
| answerValueSet | canonical | No description |
| _answerValueSet | ElementBase | No description |
| answerOption | [QuestionnaireItemAnswerOption] | No description |
| initial | [QuestionnaireItemInitial] | No description |
| item | [QuestionnaireItem] | No description |