| url | No | uri | Canonical identifier for this questionnaire, represented as a URI (globally unique) |
| identifier | No | Identifier[] | Additional identifier for the questionnaire |
| version | No | string | Business version of the questionnaire |
| name | No | string | Name for this questionnaire (computer friendly) |
| title | No | string | Name for this questionnaire (human friendly) |
| derivedFrom | No | canonical[] | Instantiates protocol or definition |
| status | Yes | code | draft / active / retired / unknown |
| experimental | No | boolean | For testing purposes, not real usage |
| subjectType | No | code[] | Resource that can be subject of QuestionnaireResponse |
| date | No | dateTime | Date last changed |
| publisher | No | string | Name of the publisher (organization or individual) |
| contact | No | ContactDetail[] | Contact details for the publisher |
| description | No | markdown | Natural language description of the questionnaire |
| useContext | No | UsageContext[] | The context that the content is intended to support |
| jurisdiction | No | CodeableConcept[] | Intended jurisdiction for questionnaire (if applicable) |
| purpose | No | markdown | Why this questionnaire is defined |
| copyright | No | markdown | Use and/or publishing restrictions |
| approvalDate | No | date | When the questionnaire was approved by publisher |
| lastReviewDate | No | date | When the questionnaire was last reviewed |
| effectivePeriod | No | Period | When the questionnaire is expected to be used |
| code | No | Coding[] | Concept that represents the overall questionnaire |
| item | No | QuestionnaireItem | Questions and sections within the Questionnaire |
| - id | No | string | Unique id for inter-element referencing |
| - extension | No | Extension[] | Additional content defined by implementations |
| - modifierExtension | No | Extension[] | Extensions that cannot be ignored even if unrecognized |
| - linkId | Yes | string | Unique id for item in questionnaire |
| - definition | No | uri | ElementDefinition - details for the item |
| - code | No | Coding[] | Corresponding concept for this item in a terminology |
| - prefix | No | string | E.g. “1(a)”, “2.5.3” |
| - text | No | string | Primary text for the item |
| - type | Yes | code | group / display / boolean / decimal / integer / date / dateTime + |
| - enableWhen | No | QuestionnaireItemEnableWhen | Only allow data when |
| - id | No | string | Unique id for inter-element referencing |
| - extension | No | Extension[] | Additional content defined by implementations |
| - modifierExtension | No | Extension[] | Extensions that cannot be ignored even if unrecognized |
| - question | Yes | string | Question that determines whether item is enabled |
| - operator | Yes | code | exists / = / != / > / < / >= / <= |
| - answer[x] | Yes | boolean, decimal, integer, date, dateTime, time, string, Coding, Quantity, Reference<Resource> | Value for question comparison based on operator |
| - enableBehavior | No | code | all / any |
| - required | No | boolean | Whether the item must be included in data results |
| - repeats | No | boolean | Whether the item may repeat |
| - readOnly | No | boolean | Don’t allow human editing |
| - maxLength | No | integer | No more than this many characters |
| - answerValueSet | No | canonical | Valueset containing permitted answers |
| - answerOption | No | QuestionnaireItemAnswerOption | Permitted answer |
| - id | No | string | Unique id for inter-element referencing |
| - extension | No | Extension[] | Additional content defined by implementations |
| - modifierExtension | No | Extension[] | Extensions that cannot be ignored even if unrecognized |
| - value[x] | Yes | integer, date, time, string, Coding, Reference<Resource> | Answer value |
| - initialSelected | No | boolean | Whether option is selected by default |
| - initial | No | QuestionnaireItemInitial | Initial value(s) when item is first rendered |
| - id | No | string | Unique id for inter-element referencing |
| - extension | No | Extension[] | Additional content defined by implementations |
| - modifierExtension | No | Extension[] | Extensions that cannot be ignored even if unrecognized |
| - value[x] | Yes | boolean, decimal, integer, date, dateTime, time, string, uri, Attachment, Coding, Quantity, Reference<Resource> | Actual value for initializing the question |
| - item | No | [] | Nested questionnaire items |
