{
  "resourceType" : "Questionnaire",
  // from Resource: id, meta, implicitRules, and language
  // from DomainResource: text, contained, extension, and modifierExtension
  "url" : "<uri>", // Canonical identifier for this questionnaire, represented as a URI (globally unique)
  "identifier" : [{ Identifier }], // Additional identifier for the questionnaire
  "version" : "<string>", // Business version of the questionnaire
  "name" : "<string>", // C? Name for this questionnaire (computer friendly)
  "title" : "<string>", // Name for this questionnaire (human friendly)
  "derivedFrom" : [{ canonical(Questionnaire) }], // Instantiates protocol or definition
  "status" : "<code>", // R!  draft | active | retired | unknown
  "experimental" : <boolean>, // For testing purposes, not real usage
  "subjectType" : ["<code>"], // Resource that can be subject of QuestionnaireResponse
  "date" : "<dateTime>", // Date last changed
  "publisher" : "<string>", // Name of the publisher (organization or individual)
  "contact" : [{ ContactDetail }], // Contact details for the publisher
  "description" : "<markdown>", // Natural language description of the questionnaire
  "useContext" : [{ UsageContext }], // The context that the content is intended to support
  "jurisdiction" : [{ CodeableConcept }], // Intended jurisdiction for questionnaire (if applicable)
  "purpose" : "<markdown>", // Why this questionnaire is defined
  "copyright" : "<markdown>", // Use and/or publishing restrictions
  "approvalDate" : "<date>", // When the questionnaire was approved by publisher
  "lastReviewDate" : "<date>", // When the questionnaire was last reviewed
  "effectivePeriod" : { Period }, // When the questionnaire is expected to be used
  "code" : [{ Coding }], // Concept that represents the overall questionnaire
  "item" : [{ // C? Questions and sections within the Questionnaire
    "linkId" : "<string>", // R!  Unique id for item in questionnaire
    "definition" : "<uri>", // ElementDefinition - details for the item
    "code" : [{ Coding }], // C? Corresponding concept for this item in a terminology
    "prefix" : "<string>", // E.g. "1(a)", "2.5.3"
    "text" : "<string>", // Primary text for the item
    "type" : "<code>", // R!  group | display | boolean | decimal | integer | date | dateTime +
    "enableWhen" : [{ // Only allow data when
      "question" : "<string>", // R!  Question that determines whether item is enabled
      "operator" : "<code>", // R!  exists | = | != | > | < | >= | <=
      // answer[x]: Value for question comparison based on operator. One of these 10:
      "answerBoolean" : <boolean>
      "answerDecimal" : <decimal>
      "answerInteger" : <integer>
      "answerDate" : "<date>"
      "answerDateTime" : "<dateTime>"
      "answerTime" : "<time>"
      "answerString" : "<string>"
      "answerCoding" : { Coding }
      "answerQuantity" : { Quantity }
      "answerReference" : { Reference(Any) }
    }],
    "enableBehavior" : "<code>", // C? all | any
    "required" : <boolean>, // C? Whether the item must be included in data results
    "repeats" : <boolean>, // C? Whether the item may repeat
    "readOnly" : <boolean>, // C? Don't allow human editing
    "maxLength" : <integer>, // C? No more than this many characters
    "answerValueSet" : { canonical(ValueSet) }, // C? Valueset containing permitted answers
    "answerOption" : [{ // C? Permitted answer
      // value[x]: Answer value. One of these 6:
      "valueInteger" : <integer>,
      "valueDate" : "<date>",
      "valueTime" : "<time>",
      "valueString" : "<string>",
      "valueCoding" : { Coding },
      "valueReference" : { Reference(Any) },
      "initialSelected" : <boolean> // Whether option is selected by default
    }],
    "initial" : [{ // C? Initial value(s) when item is first rendered
      // value[x]: Actual value for initializing the question. One of these 12:
      "valueBoolean" : <boolean>
      "valueDecimal" : <decimal>
      "valueInteger" : <integer>
      "valueDate" : "<date>"
      "valueDateTime" : "<dateTime>"
      "valueTime" : "<time>"
      "valueString" : "<string>"
      "valueUri" : "<uri>"
      "valueAttachment" : { Attachment }
      "valueCoding" : { Coding }
      "valueQuantity" : { Quantity }
      "valueReference" : { Reference(Any) }
    }],
    "item" : [{ Content as for Questionnaire.item }] // C? Nested questionnaire items
  }]
}