Structured Data Capture
4.0.0-ballot - STU 4 ballot International flag

This page is part of the Structured Data Capture FHIR IG (v4.0.0-ballot: STU 4 Ballot 1) based on FHIR (HL7® FHIR® Standard) R4. The current version which supersedes this version is 3.0.0. For a full list of available versions, see the Directory of published versions

Resource Profile: SDCQuestionnaireBehave - Detailed Descriptions

Page standards status: Trial-use Maturity Level: 4

Definitions for the sdc-questionnaire-behave resource profile.

Guidance on how to interpret the contents of this table can be found here

0. Questionnaire
Definition

Defines additional capabilities for controlling data entry and calculating values within the questionnaire.

ShortAdvanced Behavior Questionnaire
2. Questionnaire.extension:entryMode
Slice NameentryMode
Control0..*
TypeExtension(Entry mode) (Extension Type: code)
Must Supporttrue
4. Questionnaire.extension:submissionEndpoint
Slice NamesubmissionEndpoint
Control0..*
TypeExtension(Endpoint) (Extension Type: uri)
Must Supporttrue
6. Questionnaire.extension:signatureRequired
Slice NamesignatureRequired
Control0..*
TypeExtension(Questionnaire Signature Required) (Extension Type: CodeableConcept)
8. Questionnaire.extension:constraint
Slice Nameconstraint
Control0..*
TypeExtension(Target Constraint) (Complex Extension)
10. Questionnaire.extension:library
Slice Namelibrary
Definition

A reference to a library containing cql used in this Questionnaire.

Control0..*
TypeExtension(CQF Library) (Extension Type: canonical(Library))
12. Questionnaire.extension:launchContext
Slice NamelaunchContext
Control0..*
TypeExtension(Launch Contexts) (Complex Extension)
14. Questionnaire.extension:variable
Slice Namevariable
Control0..*
TypeExtension(Variable) (Extension Type: Expression)
Requirements

Allows variables to be calculated higher in the context of a QuestionnaireResponse for use with enableWhen-expression.

16. Questionnaire.modifierExtension
SlicingThis element introduces a set of slices on Questionnaire.modifierExtension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
  • value @ url
  • 18. Questionnaire.modifierExtension:rendering-criticalExtension
    Slice Namerendering-criticalExtension
    Control0..*
    TypeExtension(Rendering Critical Extension) (Extension Type: canonical)
    Must Supporttrue
    20. Questionnaire.item
    Invariantssdc-behave-2: An item cannot have both enableWhen and enableWhenExpression (enableWhen.empty() or extension('http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-enableWhenExpression').empty())
    sdc-behave-1: An item cannot have both initial.value and initialExpression (initial.empty() or extension('http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-initialExpression').empty())
    sdc-behave-3: For items of type 'quantity', it is best practice to include either a 'unitOption' or 'unitValueSet' extension to provide a list of valid units. ((type = 'quantity' implies (extension('http://hl7.org/fhir/StructureDefinition/questionnaire-unitOption').exists() or extension('http://hl7.org/fhir/StructureDefinition/questionnaire-unitValueSet').exists())) and (repeat(item).where(type = 'quantity')).all(extension('http://hl7.org/fhir/StructureDefinition/questionnaire-unitOption').exists() or extension('http://hl7.org/fhir/StructureDefinition/questionnaire-unitValueSet').exists()))
    22. Questionnaire.item.extension:disabledDisplay
    Slice NamedisabledDisplay
    Control0..1
    TypeExtension(Extension Definition for Questionnaire.item.disabledDisplay for Version 5.0) (Extension Type: code)
    24. Questionnaire.item.extension:answerExpression
    Slice NameanswerExpression
    Control0..1
    TypeExtension(Answer Expression) (Extension Type: Expression)
    Must Supporttrue
    26. Questionnaire.item.extension:usageMode
    Slice NameusageMode
    Control0..1
    TypeExtension(QuestionnaireResponse Usage Mode) (Extension Type: code)
    Must Supporttrue
    28. Questionnaire.item.extension:itemSignatureRequired
    Slice NameitemSignatureRequired
    Control0..*
    TypeExtension(Questionnaire Signature Required) (Extension Type: CodeableConcept)
    30. Questionnaire.item.extension:itemMinOccurs
    Slice NameitemMinOccurs
    Control0..1
    TypeExtension(Questionnaire Min Occurs) (Extension Type: integer)
    Must Supporttrue
    32. Questionnaire.item.extension:itemMinOccurs.value[x]
    [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
    Must Supportfalse
    34. Questionnaire.item.extension:itemMinOccurs.value[x].extension
    SlicingThis element introduces a set of slices on Questionnaire.item.extension.value[x].extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
    • value @ url
    • 36. Questionnaire.item.extension:itemMinOccurs.value[x].extension:itemMinOccursExpression
      Slice NameitemMinOccursExpression
      Control0..1
      TypeExtension(CQF Expression) (Extension Type: Expression)
      Must Supporttrue
      38. Questionnaire.item.extension:itemMaxOccurs
      Slice NameitemMaxOccurs
      Control0..1
      TypeExtension(Questionnaire Max Occurs) (Extension Type: integer)
      Must Supporttrue
      40. Questionnaire.item.extension:itemMaxOccurs.value[x]
      [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
      Must Supportfalse
      42. Questionnaire.item.extension:itemMaxOccurs.value[x].extension
      SlicingThis element introduces a set of slices on Questionnaire.item.extension.value[x].extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
      • value @ url
      • 44. Questionnaire.item.extension:itemMaxOccurs.value[x].extension:itemMaxOccursExpression
        Slice NameitemMaxOccursExpression
        Control0..1
        TypeExtension(CQF Expression) (Extension Type: Expression)
        Must Supporttrue
        46. Questionnaire.item.extension:minLength
        Slice NameminLength
        Control0..1
        TypeExtension(Min length) (Extension Type: integer)
        Must Supporttrue
        48. Questionnaire.item.extension:regex
        Slice Nameregex
        Control0..1
        TypeExtension(regex) (Extension Type: string)
        Must Supporttrue
        50. Questionnaire.item.extension:minValue
        Slice NameminValue
        Control0..1
        TypeExtension(Min value) (Extension Type: Choice of: date, dateTime, time, decimal, integer, Quantity)
        Must Supporttrue
        52. Questionnaire.item.extension:minValue.value[x]
        [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
        Must Supportfalse
        54. Questionnaire.item.extension:minValue.value[x].extension:minValueCalculated
        Slice NameminValueCalculated
        Control0..1
        TypeExtension(Calculated value) (Extension Type: Expression)
        56. Questionnaire.item.extension:maxValue
        Slice NamemaxValue
        Control0..1
        TypeExtension(Max value) (Extension Type: Choice of: date, dateTime, time, decimal, integer, Quantity)
        Must Supporttrue
        58. Questionnaire.item.extension:maxValue.value[x]
        [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
        Must Supportfalse
        60. Questionnaire.item.extension:maxValue.value[x].extension:maxValueCalculated
        Slice NamemaxValueCalculated
        Control0..1
        TypeExtension(Calculated value) (Extension Type: Expression)
        62. Questionnaire.item.extension:minQuantity
        Slice NameminQuantity
        Control0..1
        TypeExtension(Min quantity) (Extension Type: Quantity)
        Must Supportfalse
        64. Questionnaire.item.extension:minQuantity.value[x]
        [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
        Must Supportfalse
        66. Questionnaire.item.extension:minQuantity.value[x].extension:minQuantityCalculated
        Slice NameminQuantityCalculated
        Control0..1
        TypeExtension(Calculated value) (Extension Type: Expression)
        68. Questionnaire.item.extension:maxQuantity
        Slice NamemaxQuantity
        Control0..1
        TypeExtension(Max quantity) (Extension Type: Quantity)
        Must Supportfalse
        70. Questionnaire.item.extension:maxQuantity.value[x]
        [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
        Must Supportfalse
        72. Questionnaire.item.extension:maxQuantity.value[x].extension:maxQuantityCalculated
        Slice NamemaxQuantityCalculated
        Control0..1
        TypeExtension(Calculated value) (Extension Type: Expression)
        74. Questionnaire.item.extension:maxDecimalPlaces
        Slice NamemaxDecimalPlaces
        Control0..1
        TypeExtension(Max decimal places) (Extension Type: integer)
        Must Supporttrue
        76. Questionnaire.item.extension:mimeType
        Slice NamemimeType
        Control0..*
        TypeExtension(Mime type) (Extension Type: code)
        Must Supporttrue
        78. Questionnaire.item.extension:maxSize
        Slice NamemaxSize
        Control0..1
        TypeExtension(Max size) (Extension Type: decimal)
        80. Questionnaire.item.extension:answerOptionsToggleExpression
        Slice NameanswerOptionsToggleExpression
        Control0..*
        TypeExtension(Answer Options Toggle Expression) (Complex Extension)
        Must Supporttrue
        82. Questionnaire.item.extension:unitOption
        Slice NameunitOption
        Control0..*
        TypeExtension(QuestionnaireResponse Unit Option) (Extension Type: Coding)
        Must Supporttrue
        84. Questionnaire.item.extension:unitValueSet
        Slice NameunitValueSet
        Control0..1
        TypeExtension(QuestionnaireResponse Unit ValueSet) (Extension Type: canonical(ValueSet))
        Must Supporttrue
        86. Questionnaire.item.extension:unitOpen
        Slice NameunitOpen
        Control0..1
        TypeExtension(Units open?) (Extension Type: code)
        88. Questionnaire.item.extension:unitSupplementalSystem
        Slice NameunitSupplementalSystem
        Control0..1
        TypeExtension(Code system for other units) (Extension Type: canonical)
        90. Questionnaire.item.extension:allowedResource
        Slice NameallowedResource
        Control0..*
        TypeExtension(Questionnaire Reference Resource) (Extension Type: code)
        Must Supporttrue
        92. Questionnaire.item.extension:allowedProfile
        Slice NameallowedProfile
        Control0..*
        TypeExtension(Questionnaire Reference Profile) (Extension Type: canonical(StructureDefinition))
        94. Questionnaire.item.extension:candidateExpression
        Slice NamecandidateExpression
        Control0..1
        TypeExtension(Candidate Answers Expression) (Extension Type: Expression)
        96. Questionnaire.item.extension:lookupQuestionnaire
        Slice NamelookupQuestionnaire
        Control0..1
        TypeExtension(Lookup questionnaire) (Extension Type: canonical)
        98. Questionnaire.item.extension:itemConstraint
        Slice NameitemConstraint
        Control0..*
        TypeExtension(Target Constraint) (Complex Extension)
        100. Questionnaire.item.extension:initialExpression
        Slice NameinitialExpression
        Control0..1
        TypeExtension(Initial Expression) (Extension Type: Expression)
        102. Questionnaire.item.extension:calculatedExpression
        Slice NamecalculatedExpression
        Control0..1
        TypeExtension(Calculated Expression) (Extension Type: Expression)
        104. Questionnaire.item.extension:enableWhenExpression
        Slice NameenableWhenExpression
        Control0..1
        TypeExtension(Enable when expression) (Extension Type: Expression)
        Must Supporttrue
        106. Questionnaire.item.extension:keyboardType
        Slice NamekeyboardType
        Control0..1
        TypeExtension(Keyboard Type Extension) (Extension Type: Coding)
        108. Questionnaire.item.enableWhen
        110. Questionnaire.item.enableWhen.question
        Must Supporttrue
        112. Questionnaire.item.enableWhen.operator
        Must Supporttrue
        114. Questionnaire.item.enableWhen.answer[x]
        [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
        Must Supporttrue
        116. Questionnaire.item.enableBehavior
        Must Supporttrue
        118. Questionnaire.item.required
        120. Questionnaire.item.required.value
        122. Questionnaire.item.required.value.extension
        SlicingThis element introduces a set of slices on Questionnaire.item.required.value.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
        • value @ url
        • 124. Questionnaire.item.required.value.extension:requiredExpression
          Slice NamerequiredExpression
          Control0..1
          TypeExtension(CQF Expression) (Extension Type: Expression)
          Must Supporttrue
          126. Questionnaire.item.repeats
          128. Questionnaire.item.repeats.value
          130. Questionnaire.item.repeats.value.extension
          SlicingThis element introduces a set of slices on Questionnaire.item.repeats.value.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
          • value @ url
          • 132. Questionnaire.item.repeats.value.extension:repeatsExpression
            Slice NamerepeatsExpression
            Control0..1
            TypeExtension(CQF Expression) (Extension Type: Expression)
            Must Supporttrue
            134. Questionnaire.item.readOnly
            136. Questionnaire.item.readOnly.value
            138. Questionnaire.item.readOnly.value.extension
            SlicingThis element introduces a set of slices on Questionnaire.item.readOnly.value.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
            • value @ url
            • 140. Questionnaire.item.readOnly.value.extension:readOnlyExpression
              Slice NamereadOnlyExpression
              Control0..1
              TypeExtension(CQF Expression) (Extension Type: Expression)
              Must Supporttrue
              142. Questionnaire.item.answerValueSet
              144. Questionnaire.item.answerValueSet.value
              146. Questionnaire.item.answerValueSet.value.extension
              SlicingThis element introduces a set of slices on Questionnaire.item.answerValueSet.value.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
              • value @ url
              • 148. Questionnaire.item.answerValueSet.value.extension:answerValueSetExpression
                Slice NameanswerValueSetExpression
                Control0..1
                TypeExtension(CQF Expression) (Extension Type: Expression)
                Must Supporttrue
                150. Questionnaire.item.answerOption
                152. Questionnaire.item.answerOption.extension
                SlicingThis element introduces a set of slices on Questionnaire.item.answerOption.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                • value @ url
                • 154. Questionnaire.item.answerOption.extension:optionExclusive
                  Slice NameoptionExclusive
                  Control0..1
                  TypeExtension(Questionnaire Option Exclusive) (Extension Type: boolean)
                  Must Supporttrue
                  156. Questionnaire.item.answerOption.extension:itemWeight
                  Slice NameitemWeight
                  Comments

                  NOTE: questionnaire.item.answerOption can have a type of Coding, potentially allowing two different scopes for this extension. In the case where answerOption is available, the weight SHALL be declared on the answerOption rather than on the answerOption.valueCoding.

                  Control0..1
                  TypeExtension(Item Weight) (Extension Type: decimal)
                  Must Supporttrue

                  Guidance on how to interpret the contents of this table can be found here

                  0. Questionnaire
                  Definition

                  Defines additional capabilities for controlling data entry and calculating values within the questionnaire.


                  A structured set of questions intended to guide the collection of answers from end-users. Questionnaires provide detailed control over order, presentation, phraseology and grouping to allow coherent, consistent data collection.

                  ShortAdvanced Behavior QuestionnaireA structured set of questions
                  Control0..*
                  Is Modifierfalse
                  Summaryfalse
                  Alternate NamesForm, CRF, Survey
                  Invariantsdom-2: If the resource is contained in another resource, it SHALL NOT contain nested Resources (contained.contained.empty())
                  dom-3: If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource (contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty())
                  dom-4: If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated (contained.meta.versionId.empty() and contained.meta.lastUpdated.empty())
                  dom-5: If a resource is contained in another resource, it SHALL NOT have a security label (contained.meta.security.empty())
                  dom-6: A resource should have narrative for robust management (text.`div`.exists())
                  que-0: Name should be usable as an identifier for the module by machine processing applications such as code generation (name.matches('[A-Z]([A-Za-z0-9_]){0,254}'))
                  que-2: The link ids for groups and questions must be unique within the questionnaire (descendants().linkId.isDistinct())
                  cnl-0: Name should be usable as an identifier for the module by machine processing applications such as code generation (name.exists() implies name.matches('^[A-Z]([A-Za-z0-9_]){1,254}$'))
                  sdc-2: If version is present, versionAlgorithm must be present. (version.exists() implies extension.where(url='http://hl7.org/fhir/5.0/StructureDefinition/extension-Questionnaire.versionAlgorithm[x]').exists())
                  sdc-3: Semver is the preferred version algorithm - package machinery doesn't work well with artifacts using alternate versioning schemes (extension.where(url='http://hl7.org/fhir/5.0/StructureDefinition/extension-Questionnaire.versionAlgorithm[x]').all(value.ofType(Coding).where(system='http://hl7.org/fhir/version-algorithm' and code='semver').exists()))
                  que-0: Name should be usable as an identifier for the module by machine processing applications such as code generation (name.matches('[A-Z]([A-Za-z0-9_]){0,254}'))
                  que-2: The link ids for groups and questions must be unique within the questionnaire (descendants().linkId.isDistinct())
                  2. Questionnaire.implicitRules
                  Definition

                  A reference to a set of rules that were followed when the resource was constructed, and which must be understood when processing the content. Often, this is a reference to an implementation guide that defines the special rules along with other profiles etc.

                  ShortA set of rules under which this content was created
                  Comments

                  Asserting this rule set restricts the content to be only understood by a limited set of trading partners. This inherently limits the usefulness of the data in the long term. However, the existing health eco-system is highly fractured, and not yet ready to define, collect, and exchange data in a generally computable sense. Wherever possible, implementers and/or specification writers should avoid using this element. Often, when used, the URL is a reference to an implementation guide that defines these special rules as part of it's narrative along with other profiles, value sets, etc.

                  Control0..1
                  Typeuri
                  Is Modifiertrue because This element is labeled as a modifier because the implicit rules may provide additional knowledge about the resource that modifies it's meaning or interpretation
                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                  Summarytrue
                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                  4. Questionnaire.extension:versionAlgorithm
                  Slice NameversionAlgorithm
                  Definition

                  Optional Extension Element - found in all resources.

                  ShortOptional Extensions Element
                  Control0..1
                  This element is affected by the following invariants: ele-1
                  TypeExtension(Extension Definition for Questionnaire.versionAlgorithm[x] for Version 5.0) (Extension Type: Choice of: string, Coding)
                  Is Modifierfalse
                  Must Supporttrue
                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                  6. Questionnaire.extension:copyrightLabel
                  Slice NamecopyrightLabel
                  Definition

                  Optional Extension Element - found in all resources.

                  ShortOptional Extensions Element
                  Control0..1
                  This element is affected by the following invariants: ele-1
                  TypeExtension(Extension Definition for Questionnaire.copyrightLabel for Version 5.0) (Extension Type: string)
                  Is Modifierfalse
                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                  8. Questionnaire.extension:entryMode
                  Slice NameentryMode
                  Definition

                  Indicates how questions within the questionnaire should be presented to the end-user. Specifically, differentiates whether the questions should be displayed one-at-a-time with no ability to adjust prior entries; one-at-a-time or continuously expanding where all questions up to the current question can be looked at and edited, or random, where all questions can be seen and the questions can be filled out in any order desired.

                  Shortsequential | prior-edit | random
                  Comments

                  The prior-edit functionality can be accomplished by adding questions to the screen as each subsequent question is answered (resulting in all questions being displayed in a single screen) or with a view that shows only one question at a time but allows backward navigation to view and/or edit prior answers.

                  Control0..*
                  TypeExtension(Entry mode) (Extension Type: code)
                  Is Modifierfalse
                  Must Supporttrue
                  Summaryfalse
                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                  10. Questionnaire.extension:submissionEndpoint
                  Slice NamesubmissionEndpoint
                  Definition

                  The base URL for the server to which questionnaire response associated with this questionnaire should be submitted. If multiple repetitions are present, the completed form should be sent to all listed endpoints.

                  ShortWhere to send answers
                  Comments

                  Indicates that the form has been designed with an expectation that it will be submitted to the specified URI. If multiple endpoints are specified, expectation is that answers are submitted to all endpoints.

                  If no end-point is specified, then the form is not exclusively designed to be submitted to a specific site. If and where the form needs to be submitted or how the form should be internally processed must be inferred from external context or system business rules.

                  Endpoints may have expectations around authorization, etc. Some of this may be learned by consulting the CapabilityStatement associated with the endpoint.

                  Control0..*
                  TypeExtension(Endpoint) (Extension Type: uri)
                  Is Modifierfalse
                  Must Supporttrue
                  Summaryfalse
                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                  12. Questionnaire.extension:signatureRequired
                  Slice NamesignatureRequired
                  Definition

                  Indicates that a signature (of the specified type) is needed when completing the QuestionnaireResponse.

                  ShortIs signature needed?
                  Comments

                  If this appears at the Questionnaire level, then the signature will be gathered for the entire form when it is marked complete. If it appears on a particular item, then it will be gathered on that question or group when it is filled in. (E.g. seeking the user's initials beside certain questions.)

                  The signature can be captured using the http://hl7.org/fhir/StructureDefinition/questionnaireresponse-signature extension. See additional guidance and examples in the SDC implementation guide.

                  Control0..*
                  TypeExtension(Questionnaire Signature Required) (Extension Type: CodeableConcept)
                  Is Modifierfalse
                  Summaryfalse
                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                  14. Questionnaire.extension:constraint
                  Slice Nameconstraint
                  Definition

                  Specifies a constraint that is enforced on instantiated (or target) resources. This extension can be applied to definitional resources (such as ActivityDefinition or Measure) and indicates that the constraint should be enforced on resources that are instantiated from the definition.

                  ShortA constraint on the target resource
                  Comments

                  Can be used on any definitional artifact to define a constraint that is enforced in the context of an instantiated resource. The constraint expression will have access to %target and %definition variables, where target is the instantiated resource, and definition is the definition used to instantiate.

                  Control0..*
                  TypeExtension(Target Constraint) (Complex Extension)
                  Is Modifierfalse
                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                  16. Questionnaire.extension:library
                  Slice Namelibrary
                  Definition

                  A reference to a library containing cql used in this Questionnaire.

                  ShortA library containing logic used by the artifact
                  Comments

                  For questionnaires, see additional guidance and examples in the SDC implementation guide.

                  Control0..*
                  TypeExtension(CQF Library) (Extension Type: canonical(Library))
                  Is Modifierfalse
                  Summaryfalse
                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                  18. Questionnaire.extension:launchContext
                  Slice NamelaunchContext
                  Definition

                  Resources that provide context for form processing logic (pre-population, flow-control, drop-down selection, etc.) when creating/displaying/editing a QuestionnaireResponse.

                  ShortContext resources needed for Questionnaire
                  Comments

                  3 of these launch contexts are aligned with the existing SMART on FHIR "launch" contexts.

                  Control0..*
                  TypeExtension(Launch Contexts) (Complex Extension)
                  Is Modifierfalse
                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                  20. Questionnaire.extension:variable
                  Slice Namevariable
                  Definition

                  Variable specifying a logic to generate a variable for use in subsequent logic. The name of the variable will be added to FHIRPath's context when processing descendants of the element that contains this extension as well as extensions within the same element.

                  ShortVariable for processing
                  Comments

                  Ordering of variable extension declarations is significant as variables declared in one repetition of this extension might be used in subsequent extension repetitions

                  For questionnaires, see additional guidance and examples in the SDC implementation guide.

                  Control0..*
                  TypeExtension(Variable) (Extension Type: Expression)
                  Is Modifierfalse
                  Summaryfalse
                  Requirements

                  Allows variables to be calculated higher in the context of a QuestionnaireResponse for use with enableWhen-expression.

                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                  22. Questionnaire.modifierExtension
                  Definition

                  An Extension


                  May be used to represent additional information that is not part of the basic definition of the resource and that modifies the understanding of the element that contains it and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                  Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

                  ShortExtensionExtensions that cannot be ignored
                  Comments

                  There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                  Control0..*
                  TypeExtension
                  Is Modifiertrue because Modifier extensions are expected to modify the meaning or interpretation of the resource that contains them
                  Summaryfalse
                  Requirements

                  Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

                  Alternate Namesextensions, user content
                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                  SlicingThis element introduces a set of slices on Questionnaire.modifierExtension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                  • value @ url
                  • 24. Questionnaire.modifierExtension:rendering-criticalExtension
                    Slice Namerendering-criticalExtension
                    Definition

                    Indicates an extension that must be supported by the system presenting the instance for data capture or end-user consumption. If a system does not recognize the extension or cannot implement the functionality defined by the extension, it should display an error message or warning and refrain from presenting the instance to the user or using it when capturing data.

                    ShortExtension that must be supported
                    Comments

                    This may point to extensions that control the appearance of data elements, control what value elements have, what elements are or are not available, what elements can or cannot be edited, or rules about how editing may occur. This extension does NOT apply when simply rendering a resource for publication purposes or for other purposes not intended for end-user data capture or data consumption.

                    Control0..*
                    This element is affected by the following invariants: ele-1
                    TypeExtension(Rendering Critical Extension) (Extension Type: canonical)
                    Is Modifiertrue because Indicates that the Questionnaire can't be safely rendered in certain situations
                    Must Supporttrue
                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                    26. Questionnaire.title
                    Definition

                    A short, descriptive, user-friendly title for the questionnaire.

                    ShortName for this questionnaire (human friendly)
                    Comments

                    This name does not need to be machine-processing friendly and may contain punctuation, white-space, etc.

                    Control0..1
                    Typestring
                    Is Modifierfalse
                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                    Must Supporttrue
                    Summarytrue
                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                    28. Questionnaire.status
                    Definition

                    The status of this questionnaire. Enables tracking the life-cycle of the content.

                    Shortdraft | active | retired | unknown
                    Comments

                    Allows filtering of questionnaires that are appropriate for use versus not.

                    Control1..1
                    BindingThe codes SHALL be taken from PublicationStatushttp://hl7.org/fhir/ValueSet/publication-status|4.0.1
                    (required to http://hl7.org/fhir/ValueSet/publication-status|4.0.1)

                    The lifecycle status of an artifact.

                    Typecode
                    Is Modifiertrue because This is labeled as "Is Modifier" because applications should not use a retired {{title}} without due consideration
                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                    Must Supporttrue
                    Summarytrue
                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                    30. Questionnaire.item
                    Definition

                    A particular question, question grouping or display text that is part of the questionnaire.

                    ShortQuestions and sections within the Questionnaire
                    Comments

                    The content of the questionnaire is constructed from an ordered, hierarchical collection of items.

                    Control0..*
                    This element is affected by the following invariants: que-3
                    TypeBackboneElement
                    Is Modifierfalse
                    Summaryfalse
                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                    que-1: Group items must have nested items, display items cannot have nested items ((type='group' implies item.empty().not()) and (type.trace('type')='display' implies item.trace('item').empty()))
                    que-3: Display items cannot have a "code" asserted (type!='display' or code.empty())
                    que-4: A question cannot have both answerOption and answerValueSet (answerOption.empty() or answerValueSet.empty())
                    que-5: Only 'choice' and 'open-choice' items can have answerValueSet ((type ='choice' or type = 'open-choice' or type = 'decimal' or type = 'integer' or type = 'date' or type = 'dateTime' or type = 'time' or type = 'string' or type = 'quantity') or (answerValueSet.empty() and answerOption.empty()))
                    que-6: Required and repeat aren't permitted for display items (type!='display' or (required.empty() and repeats.empty()))
                    que-8: Initial values can't be specified for groups or display items ((type!='group' and type!='display') or initial.empty())
                    que-9: Read-only can't be specified for "display" items (type!='display' or readOnly.empty())
                    que-10: Maximum length can only be declared for simple question types ((type in ('boolean' | 'decimal' | 'integer' | 'string' | 'text' | 'url' | 'open-choice')) or maxLength.empty())
                    que-11: If one or more answerOption is present, initial[x] must be missing (answerOption.empty() or initial.empty())
                    que-12: If there are more than one enableWhen, enableBehavior must be specified (enableWhen.count() > 2 implies enableBehavior.exists())
                    que-13: Can only have multiple initial values for repeating items (repeats=true or initial.count() <= 1)
                    sdc-1: An item cannot have an answerExpression if answerOption or answerValueSet is already present. (extension('http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-answerExpression').empty().not() implies (answerOption.empty() and answerValueSet.empty()))
                    que-1a: Group items must have nested items when Questionanire is complete ((type='group' and %resource.status='complete') implies item.empty().not())
                    que-1b: Groups should have items (type='group' implies item.empty().not())
                    que-1c: Display items cannot have child items (type='display' implies item.empty())
                    que-14: Can only have answerConstraint if answerOption, answerValueSet, or answerExpression are present. (This is a warning because other extensions may serve the same purpose) (extension('http://hl7.org/fhir/5.0/StructureDefinition/extension-Questionnaire.item.answerConstraint').exists() implies answerOption.exists() or answerValueSet.exists() or extension('http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-answerExpression').exists())
                    sdc-behave-2: An item cannot have both enableWhen and enableWhenExpression (enableWhen.empty() or extension('http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-enableWhenExpression').empty())
                    sdc-behave-1: An item cannot have both initial.value and initialExpression (initial.empty() or extension('http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-initialExpression').empty())
                    sdc-behave-3: For items of type 'quantity', it is best practice to include either a 'unitOption' or 'unitValueSet' extension to provide a list of valid units. ((type = 'quantity' implies (extension('http://hl7.org/fhir/StructureDefinition/questionnaire-unitOption').exists() or extension('http://hl7.org/fhir/StructureDefinition/questionnaire-unitValueSet').exists())) and (repeat(item).where(type = 'quantity')).all(extension('http://hl7.org/fhir/StructureDefinition/questionnaire-unitOption').exists() or extension('http://hl7.org/fhir/StructureDefinition/questionnaire-unitValueSet').exists()))
                    que-1: Group items must have nested items, display items cannot have nested items ((type='group' implies item.empty().not()) and (type.trace('type')='display' implies item.trace('item').empty()))
                    que-3: Display items cannot have a "code" asserted (type!='display' or code.empty())
                    que-4: A question cannot have both answerOption and answerValueSet (answerOption.empty() or answerValueSet.empty())
                    que-5: Only 'choice' and 'open-choice' items can have answerValueSet ((type ='choice' or type = 'open-choice' or type = 'decimal' or type = 'integer' or type = 'date' or type = 'dateTime' or type = 'time' or type = 'string' or type = 'quantity') or (answerValueSet.empty() and answerOption.empty()))
                    que-6: Required and repeat aren't permitted for display items (type!='display' or (required.empty() and repeats.empty()))
                    que-8: Initial values can't be specified for groups or display items ((type!='group' and type!='display') or initial.empty())
                    que-9: Read-only can't be specified for "display" items (type!='display' or readOnly.empty())
                    que-10: Maximum length can only be declared for simple question types ((type in ('boolean' | 'decimal' | 'integer' | 'string' | 'text' | 'url' | 'open-choice')) or maxLength.empty())
                    que-11: If one or more answerOption is present, initial[x] must be missing (answerOption.empty() or initial.empty())
                    que-12: If there are more than one enableWhen, enableBehavior must be specified (enableWhen.count() > 2 implies enableBehavior.exists())
                    que-13: Can only have multiple initial values for repeating items (repeats=true or initial.count() <= 1)
                    32. Questionnaire.item.extension:hidden
                    Slice Namehidden
                    Definition

                    If true, indicates that the extended item should not be displayed to the user.

                    ShortDon't display to user
                    Comments

                    If an item is hidden, all descendant items are hidden as well. See additional guidance and examples in the SDC implementation guide.

                    Control0..1
                    TypeExtension(Questionnaire Hidden) (Extension Type: boolean)
                    Is Modifierfalse
                    Must Supporttrue
                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                    ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                    34. Questionnaire.item.extension:answerConstraint
                    Slice NameanswerConstraint
                    Definition

                    Optional Extension Element - found in all resources.

                    ShortOptional Extensions Element
                    Control0..1
                    This element is affected by the following invariants: ele-1
                    TypeExtension(Extension Definition for Questionnaire.item.answerConstraint for Version 5.0) (Extension Type: code)
                    Is Modifierfalse
                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                    36. Questionnaire.item.extension:disabledDisplay
                    Slice NamedisabledDisplay
                    Definition

                    Optional Extension Element - found in all resources.

                    ShortOptional Extensions Element
                    Control0..1
                    TypeExtension(Extension Definition for Questionnaire.item.disabledDisplay for Version 5.0) (Extension Type: code)
                    Is Modifierfalse
                    Summaryfalse
                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                    38. Questionnaire.item.extension:answerExpression
                    Slice NameanswerExpression
                    Definition

                    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.

                    ShortExpression for possible answers
                    Comments

                    This is only permitted when the containing item does NOT have any answerOption or answerValueSet elements. The results of the expression must correspond to the item type of the question the element appears on or must correspond to a resource, backbone element or complex data type for a group item. Resources are considered a match for the Reference item type. Quantity can be a match for decimal and integer items so long as a questionnaire-unit extension is present. If the result of an expression returns a code or codes, it SHALL return the results as Coding, not code or CodeableConcept.

                    Control0..1
                    TypeExtension(Answer Expression) (Extension Type: Expression)
                    Is Modifierfalse
                    Must Supporttrue
                    Summaryfalse
                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                    40. Questionnaire.item.extension:usageMode
                    Slice NameusageMode
                    Definition

                    Identifies that the specified element should only appear in certain "modes" of operation.

                    Shortcapture | display | display-non-empty | capture-display | capture-display-non-empty
                    Comments

                    See additional guidance and examples in the SDC implementation guide.

                    Control0..1
                    TypeExtension(QuestionnaireResponse Usage Mode) (Extension Type: code)
                    Is Modifierfalse
                    Must Supporttrue
                    Summaryfalse
                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                    42. Questionnaire.item.extension:itemSignatureRequired
                    Slice NameitemSignatureRequired
                    Definition

                    Indicates that a signature (of the specified type) is needed when completing the QuestionnaireResponse.

                    ShortIs signature needed?
                    Comments

                    If this appears at the Questionnaire level, then the signature will be gathered for the entire form when it is marked complete. If it appears on a particular item, then it will be gathered on that question or group when it is filled in. (E.g. seeking the user's initials beside certain questions.)

                    The signature can be captured using the http://hl7.org/fhir/StructureDefinition/questionnaireresponse-signature extension. See additional guidance and examples in the SDC implementation guide.

                    Control0..*
                    TypeExtension(Questionnaire Signature Required) (Extension Type: CodeableConcept)
                    Is Modifierfalse
                    Summaryfalse
                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                    44. Questionnaire.item.extension:itemMinOccurs
                    Slice NameitemMinOccurs
                    Definition

                    The minimum number of times the group must appear, or the minimum number of answers for a question - when greater than 1.

                    ShortMinimum repetitions
                    Comments

                    Default assumption for "required" elements is minOccurs=1. See additional guidance and examples in the SDC implementation guide.

                    Control0..1
                    TypeExtension(Questionnaire Min Occurs) (Extension Type: integer)
                    Is Modifierfalse
                    Must Supporttrue
                    Summaryfalse
                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                    46. Questionnaire.item.extension:itemMinOccurs.extension
                    Definition

                    An Extension


                    May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                    ShortExtensionAdditional content defined by implementations
                    Comments

                    There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                    Control0..0*
                    TypeExtension
                    Is Modifierfalse
                    Summaryfalse
                    Alternate Namesextensions, user content
                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                    ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                    SlicingThis element introduces a set of slices on Questionnaire.item.extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                    • value @ url
                    • 48. Questionnaire.item.extension:itemMinOccurs.url
                      Definition

                      Source of the definition for the extension code - a logical name or a URL.

                      Shortidentifies the meaning of the extension
                      Comments

                      The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.

                      Control1..1
                      Typeuri
                      Is Modifierfalse
                      XML FormatIn the XML format, this property is represented as an attribute.
                      Summaryfalse
                      Fixed Valuehttp://hl7.org/fhir/StructureDefinition/questionnaire-minOccurs
                      50. Questionnaire.item.extension:itemMinOccurs.value[x]
                      Definition

                      Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).


                      Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).

                      ShortValue of extension
                      Control10..1
                      This element is affected by the following invariants: ext-1
                      Typeinteger, date, Meta, Address, Attachment, Count, DataRequirement, Dosage, uuid, Identifier, Coding, SampledData, id, positiveInt, Distance, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, CodeableConcept, ParameterDefinition, dateTime, code, string, Contributor, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, Signature, unsignedInt, time
                      [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                      Is Modifierfalse
                      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                      Must Supportfalse
                      Summaryfalse
                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                      ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                      52. Questionnaire.item.extension:itemMinOccurs.value[x].extension
                      Definition

                      An Extension


                      May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                      ShortExtensionAdditional content defined by implementations
                      Comments

                      There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                      Control0..*
                      TypeExtension
                      Is Modifierfalse
                      Summaryfalse
                      Alternate Namesextensions, user content
                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                      ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                      ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                      SlicingThis element introduces a set of slices on Questionnaire.item.extension.value[x].extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                      • value @ url
                      • 54. Questionnaire.item.extension:itemMinOccurs.value[x].extension:itemMinOccursExpression
                        Slice NameitemMinOccursExpression
                        Definition

                        An expression that, when evaluated, provides the value for the element on which it appears.

                        ShortAn dynamic expression
                        Comments

                        For questionnaires, see additional guidance and examples in the SDC implementation guide.

                        Control0..1
                        TypeExtension(CQF Expression) (Extension Type: Expression)
                        Is Modifierfalse
                        Must Supporttrue
                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                        ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                        56. Questionnaire.item.extension:itemMaxOccurs
                        Slice NameitemMaxOccurs
                        Definition

                        The maximum number of times the group must appear, or the maximum number of answers for a question - when greater than 1 and not unlimited.

                        ShortMaximum repetitions
                        Comments

                        Only relevant if the element has repeats=true and there's a need to constrain the number of allowed repetitions. See additional guidance and examples in the SDC implementation guide.

                        Control0..1
                        TypeExtension(Questionnaire Max Occurs) (Extension Type: integer)
                        Is Modifierfalse
                        Must Supporttrue
                        Summaryfalse
                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                        58. Questionnaire.item.extension:itemMaxOccurs.extension
                        Definition

                        An Extension


                        May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                        ShortExtensionAdditional content defined by implementations
                        Comments

                        There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                        Control0..0*
                        TypeExtension
                        Is Modifierfalse
                        Summaryfalse
                        Alternate Namesextensions, user content
                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                        ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                        SlicingThis element introduces a set of slices on Questionnaire.item.extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                        • value @ url
                        • 60. Questionnaire.item.extension:itemMaxOccurs.url
                          Definition

                          Source of the definition for the extension code - a logical name or a URL.

                          Shortidentifies the meaning of the extension
                          Comments

                          The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.

                          Control1..1
                          Typeuri
                          Is Modifierfalse
                          XML FormatIn the XML format, this property is represented as an attribute.
                          Summaryfalse
                          Fixed Valuehttp://hl7.org/fhir/StructureDefinition/questionnaire-maxOccurs
                          62. Questionnaire.item.extension:itemMaxOccurs.value[x]
                          Definition

                          Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).


                          Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).

                          ShortValue of extension
                          Control10..1
                          This element is affected by the following invariants: ext-1
                          Typeinteger, date, Meta, Address, Attachment, Count, DataRequirement, Dosage, uuid, Identifier, Coding, SampledData, id, positiveInt, Distance, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, CodeableConcept, ParameterDefinition, dateTime, code, string, Contributor, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, Signature, unsignedInt, time
                          [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                          Is Modifierfalse
                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                          Must Supportfalse
                          Summaryfalse
                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                          ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                          64. Questionnaire.item.extension:itemMaxOccurs.value[x].extension
                          Definition

                          An Extension


                          May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                          ShortExtensionAdditional content defined by implementations
                          Comments

                          There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                          Control0..*
                          TypeExtension
                          Is Modifierfalse
                          Summaryfalse
                          Alternate Namesextensions, user content
                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                          ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                          ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                          SlicingThis element introduces a set of slices on Questionnaire.item.extension.value[x].extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                          • value @ url
                          • 66. Questionnaire.item.extension:itemMaxOccurs.value[x].extension:itemMaxOccursExpression
                            Slice NameitemMaxOccursExpression
                            Definition

                            An expression that, when evaluated, provides the value for the element on which it appears.

                            ShortAn dynamic expression
                            Comments

                            For questionnaires, see additional guidance and examples in the SDC implementation guide.

                            Control0..1
                            TypeExtension(CQF Expression) (Extension Type: Expression)
                            Is Modifierfalse
                            Must Supporttrue
                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                            ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                            68. Questionnaire.item.extension:minLength
                            Slice NameminLength
                            Definition

                            The minimum number of characters that must be present in the simple data type to be considered a "valid" instance.

                            ShortAt least this many characters
                            Comments

                            For base64binary, reflects the number of characters representing the encoded data, not the number of bytes of the binary data. For questionnaires, see additional guidance and examples in the SDC implementation guide.

                            Control0..1
                            TypeExtension(Min length) (Extension Type: integer)
                            Is Modifierfalse
                            Must Supporttrue
                            Summaryfalse
                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                            70. Questionnaire.item.extension:regex
                            Slice Nameregex
                            Definition

                            A regular expression that defines the syntax for the data element to be considered valid.

                            ShortRegular expression pattern
                            Control0..1
                            TypeExtension(regex) (Extension Type: string)
                            Is Modifierfalse
                            Must Supporttrue
                            Summaryfalse
                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                            72. Questionnaire.item.extension:minValue
                            Slice NameminValue
                            Definition

                            The inclusive lower bound on the range of allowed values for the data element.

                            ShortMust be >= this value
                            Comments

                            Data type specified must be the same as the data type for the data element. For questionnaires, see additional guidance and examples in the SDC implementation guide.

                            Control0..1
                            TypeExtension(Min value) (Extension Type: Choice of: date, dateTime, time, decimal, integer, Quantity)
                            Is Modifierfalse
                            Must Supporttrue
                            Summaryfalse
                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                            74. Questionnaire.item.extension:minValue.extension
                            Definition

                            An Extension


                            May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                            ShortExtensionAdditional content defined by implementations
                            Comments

                            There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                            Control0..0*
                            TypeExtension
                            Is Modifierfalse
                            Summaryfalse
                            Alternate Namesextensions, user content
                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                            ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                            SlicingThis element introduces a set of slices on Questionnaire.item.extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                            • value @ url
                            • 76. Questionnaire.item.extension:minValue.url
                              Definition

                              Source of the definition for the extension code - a logical name or a URL.

                              Shortidentifies the meaning of the extension
                              Comments

                              The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.

                              Control1..1
                              Typeuri
                              Is Modifierfalse
                              XML FormatIn the XML format, this property is represented as an attribute.
                              Summaryfalse
                              Fixed Valuehttp://hl7.org/fhir/StructureDefinition/minValue
                              78. Questionnaire.item.extension:minValue.value[x]
                              Definition

                              Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).


                              Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).

                              ShortValue of extension
                              Control10..1
                              This element is affected by the following invariants: ext-1
                              TypeChoice of: date, dateTime, time, decimal, integer, Quantity, Meta, Address, Attachment, Count, DataRequirement, Dosage, uuid, Identifier, Coding, SampledData, id, positiveInt, Distance, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, CodeableConcept, ParameterDefinition, code, string, Contributor, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, uri, url, Annotation, ContactDetail, boolean, Expression, Signature, unsignedInt
                              [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                              Is Modifierfalse
                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                              Must Supportfalse
                              Summaryfalse
                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                              ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                              80. Questionnaire.item.extension:minValue.value[x].extension:minValueCalculated
                              Slice NameminValueCalculated
                              Definition

                              An expression that determines a calculated value. The expression may be simply the name of a expression in a referenced library, or it may be a complete inline expression.

                              ShortA calculated value
                              Comments

                              For questionnaires, see additional guidance and examples in the SDC implementation guide.

                              Control0..1
                              TypeExtension(Calculated value) (Extension Type: Expression)
                              Is Modifierfalse
                              Summaryfalse
                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                              ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                              82. Questionnaire.item.extension:maxValue
                              Slice NamemaxValue
                              Definition

                              The inclusive upper bound on the range of allowed values for the data element.

                              ShortMust be <= this value
                              Comments

                              Data type specified must be the same as the data type for the data element. For questionnaires, see additional guidance and examples in the SDC implementation guide.

                              Control0..1
                              TypeExtension(Max value) (Extension Type: Choice of: date, dateTime, time, decimal, integer, Quantity)
                              Is Modifierfalse
                              Must Supporttrue
                              Summaryfalse
                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                              ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                              84. Questionnaire.item.extension:maxValue.extension
                              Definition

                              An Extension


                              May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                              ShortExtensionAdditional content defined by implementations
                              Comments

                              There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                              Control0..0*
                              TypeExtension
                              Is Modifierfalse
                              Summaryfalse
                              Alternate Namesextensions, user content
                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                              ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                              ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                              ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                              SlicingThis element introduces a set of slices on Questionnaire.item.extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                              • value @ url
                              • 86. Questionnaire.item.extension:maxValue.url
                                Definition

                                Source of the definition for the extension code - a logical name or a URL.

                                Shortidentifies the meaning of the extension
                                Comments

                                The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.

                                Control1..1
                                Typeuri
                                Is Modifierfalse
                                XML FormatIn the XML format, this property is represented as an attribute.
                                Summaryfalse
                                Fixed Valuehttp://hl7.org/fhir/StructureDefinition/maxValue
                                88. Questionnaire.item.extension:maxValue.value[x]
                                Definition

                                Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).


                                Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).

                                ShortValue of extension
                                Control10..1
                                This element is affected by the following invariants: ext-1
                                TypeChoice of: date, dateTime, time, decimal, integer, Quantity, Meta, Address, Attachment, Count, DataRequirement, Dosage, uuid, Identifier, Coding, SampledData, id, positiveInt, Distance, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, CodeableConcept, ParameterDefinition, code, string, Contributor, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, uri, url, Annotation, ContactDetail, boolean, Expression, Signature, unsignedInt
                                [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                                Is Modifierfalse
                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                Must Supportfalse
                                Summaryfalse
                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                90. Questionnaire.item.extension:maxValue.value[x].extension:maxValueCalculated
                                Slice NamemaxValueCalculated
                                Definition

                                An expression that determines a calculated value. The expression may be simply the name of a expression in a referenced library, or it may be a complete inline expression.

                                ShortA calculated value
                                Comments

                                For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                Control0..1
                                TypeExtension(Calculated value) (Extension Type: Expression)
                                Is Modifierfalse
                                Summaryfalse
                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                92. Questionnaire.item.extension:minQuantity
                                Slice NameminQuantity
                                Definition

                                The inclusive lower bound on the range of allowed values for a 'quantity' type question. Open Issue: Revisit whether this should be folded into the regular minValue extension once there are better capabilities around defining conformance expectations regarding extensions.

                                ShortMust be >= this value
                                Comments

                                This must only be used if the set of permitted units is constrained to UCUM codes and the minimum checks will be performed by converting the answer.valueQuantity to the same units as the minQuantity unit prior to comparison.

                                Control0..1
                                TypeExtension(Min quantity) (Extension Type: Quantity)
                                Is Modifierfalse
                                Must Supportfalse
                                Summaryfalse
                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                94. Questionnaire.item.extension:minQuantity.extension
                                Definition

                                An Extension


                                May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                ShortExtensionAdditional content defined by implementations
                                Comments

                                There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                Control0..0*
                                TypeExtension
                                Is Modifierfalse
                                Summaryfalse
                                Alternate Namesextensions, user content
                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                SlicingThis element introduces a set of slices on Questionnaire.item.extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                • value @ url
                                • 96. Questionnaire.item.extension:minQuantity.url
                                  Definition

                                  Source of the definition for the extension code - a logical name or a URL.

                                  Shortidentifies the meaning of the extension
                                  Comments

                                  The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.

                                  Control1..1
                                  Typeuri
                                  Is Modifierfalse
                                  XML FormatIn the XML format, this property is represented as an attribute.
                                  Summaryfalse
                                  Fixed Valuehttp://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-minQuantity
                                  98. Questionnaire.item.extension:minQuantity.value[x]
                                  Definition

                                  Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).

                                  ShortValue of extension
                                  Control0..1
                                  TypeQuantity, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, Coding, SampledData, id, positiveInt, Distance, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, CodeableConcept, ParameterDefinition, dateTime, code, string, Contributor, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, uri, url, Annotation, ContactDetail, boolean, Expression, Signature, unsignedInt, time
                                  [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                                  Is Modifierfalse
                                  Must Supportfalse
                                  Summaryfalse
                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                  100. Questionnaire.item.extension:minQuantity.value[x].extension:minQuantityCalculated
                                  Slice NameminQuantityCalculated
                                  Definition

                                  An expression that determines a calculated value. The expression may be simply the name of a expression in a referenced library, or it may be a complete inline expression.

                                  ShortA calculated value
                                  Comments

                                  For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                  Control0..1
                                  TypeExtension(Calculated value) (Extension Type: Expression)
                                  Is Modifierfalse
                                  Summaryfalse
                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                  102. Questionnaire.item.extension:minQuantity.value[x].comparator
                                  Definition

                                  How the value should be understood and represented - whether the actual value is greater or less than the stated value due to measurement issues; e.g. if the comparator is "<" , then the real value is < stated value.

                                  Short< | <= | >= | > - how to understand the value
                                  Control0..1
                                  BindingThe codes SHALL be taken from QuantityComparatorhttp://hl7.org/fhir/ValueSet/quantity-comparator|4.0.1
                                  (required to http://hl7.org/fhir/ValueSet/quantity-comparator|4.0.1)

                                  How the Quantity should be understood and represented.

                                  Typecode
                                  Is Modifiertrue because This is labeled as "Is Modifier" because the comparator modifies the interpretation of the value significantly. If there is no comparator, then there is no modification of the value
                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                  Summarytrue
                                  Requirements

                                  Need a framework for handling measures where the value is <5ug/L or >400mg/L due to the limitations of measuring methodology.

                                  Meaning if MissingIf there is no comparator, then there is no modification of the value
                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                  104. Questionnaire.item.extension:maxQuantity
                                  Slice NamemaxQuantity
                                  Definition

                                  The inclusive upper bound on the range of allowed values for a 'quantity' type question. Open Issue: Revisit whether this should be folded into the regular maxValue extension once there are better capabilities around defining conformance expectations regarding extensions.

                                  ShortMust be <= this value
                                  Comments

                                  This must only be used if the set of permitted units is constrained to UCUM codes and the maximum checks will be performed by converting the answer.valueQuantity to the same units as the maxQuantity unit prior to comparison.

                                  Control0..1
                                  TypeExtension(Max quantity) (Extension Type: Quantity)
                                  Is Modifierfalse
                                  Must Supportfalse
                                  Summaryfalse
                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                  106. Questionnaire.item.extension:maxQuantity.extension
                                  Definition

                                  An Extension


                                  May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                  ShortExtensionAdditional content defined by implementations
                                  Comments

                                  There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                  Control0..0*
                                  TypeExtension
                                  Is Modifierfalse
                                  Summaryfalse
                                  Alternate Namesextensions, user content
                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                  SlicingThis element introduces a set of slices on Questionnaire.item.extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                  • value @ url
                                  • 108. Questionnaire.item.extension:maxQuantity.url
                                    Definition

                                    Source of the definition for the extension code - a logical name or a URL.

                                    Shortidentifies the meaning of the extension
                                    Comments

                                    The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.

                                    Control1..1
                                    Typeuri
                                    Is Modifierfalse
                                    XML FormatIn the XML format, this property is represented as an attribute.
                                    Summaryfalse
                                    Fixed Valuehttp://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-maxQuantity
                                    110. Questionnaire.item.extension:maxQuantity.value[x]
                                    Definition

                                    Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).

                                    ShortValue of extension
                                    Control0..1
                                    TypeQuantity, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, Coding, SampledData, id, positiveInt, Distance, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, CodeableConcept, ParameterDefinition, dateTime, code, string, Contributor, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, uri, url, Annotation, ContactDetail, boolean, Expression, Signature, unsignedInt, time
                                    [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                                    Is Modifierfalse
                                    Must Supportfalse
                                    Summaryfalse
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    112. Questionnaire.item.extension:maxQuantity.value[x].extension:maxQuantityCalculated
                                    Slice NamemaxQuantityCalculated
                                    Definition

                                    An expression that determines a calculated value. The expression may be simply the name of a expression in a referenced library, or it may be a complete inline expression.

                                    ShortA calculated value
                                    Comments

                                    For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                    Control0..1
                                    TypeExtension(Calculated value) (Extension Type: Expression)
                                    Is Modifierfalse
                                    Summaryfalse
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    114. Questionnaire.item.extension:maxQuantity.value[x].comparator
                                    Definition

                                    How the value should be understood and represented - whether the actual value is greater or less than the stated value due to measurement issues; e.g. if the comparator is "<" , then the real value is < stated value.

                                    Short< | <= | >= | > - how to understand the value
                                    Control0..1
                                    BindingThe codes SHALL be taken from QuantityComparatorhttp://hl7.org/fhir/ValueSet/quantity-comparator|4.0.1
                                    (required to http://hl7.org/fhir/ValueSet/quantity-comparator|4.0.1)

                                    How the Quantity should be understood and represented.

                                    Typecode
                                    Is Modifiertrue because This is labeled as "Is Modifier" because the comparator modifies the interpretation of the value significantly. If there is no comparator, then there is no modification of the value
                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                    Summarytrue
                                    Requirements

                                    Need a framework for handling measures where the value is <5ug/L or >400mg/L due to the limitations of measuring methodology.

                                    Meaning if MissingIf there is no comparator, then there is no modification of the value
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    116. Questionnaire.item.extension:maxDecimalPlaces
                                    Slice NamemaxDecimalPlaces
                                    Definition

                                    Identifies the maximum number of decimal places that may be specified for the data element.

                                    ShortMaximum digits after decimal
                                    Comments

                                    For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                    Control0..1
                                    TypeExtension(Max decimal places) (Extension Type: integer)
                                    Is Modifierfalse
                                    Must Supporttrue
                                    Summaryfalse
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    118. Questionnaire.item.extension:mimeType
                                    Slice NamemimeType
                                    Definition

                                    Identifies the kind(s) of attachment allowed to be sent for an element.

                                    ShortType of attachment
                                    Comments

                                    This extension only has meaning if the element has a type of Attachment. For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                    Control0..*
                                    TypeExtension(Mime type) (Extension Type: code)
                                    Is Modifierfalse
                                    Must Supporttrue
                                    Summaryfalse
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    120. Questionnaire.item.extension:maxSize
                                    Slice NamemaxSize
                                    Definition

                                    For attachment answers, indicates the maximum size in bytes an attachment can be.

                                    ShortMax size in bytes
                                    Comments

                                    This extension only has meaning if the element has a type of Attachment. For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                    Control0..1
                                    TypeExtension(Max size) (Extension Type: decimal)
                                    Is Modifierfalse
                                    Summaryfalse
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    122. Questionnaire.item.extension:answerOptionsToggleExpression
                                    Slice NameanswerOptionsToggleExpression
                                    Definition

                                    A complex expression that provides a list of the allowed options that should be enabled or disabled based on the evaluation of a provided expression. It allows toggling of allowed answers based on context, including the answers provided to other expressions.

                                    ShortExpression constraining allowed answers
                                    Comments

                                    For example, this allows a list of conditions to be modified based on the gender of the patient

                                    Control0..*
                                    TypeExtension(Answer Options Toggle Expression) (Complex Extension)
                                    Is Modifierfalse
                                    Must Supporttrue
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    124. Questionnaire.item.extension:unitOption
                                    Slice NameunitOption
                                    Definition

                                    A unit that the user may choose when providing a quantity value.

                                    ShortUnit choice
                                    Comments

                                    Provide either unitOption(s) or unitValueSet. If either of the extensions are present, the units for a Quantity element are constrained to only the units listed by the extensions - i.e. it is treated as a "required", not an "extensible" binding. In the absence of either, any unit is valid. See additional guidance and examples in the SDC implementation guide. If this extension present and an answer is provided for the question item in the QuestionnaireResponse, then the valueQuantity SHALL have a Quantity.code and Quantity.system that match the Coding.code and system of one of the allowed values if the Coding has a code and/or system. If the Coding only has a display, then the Quantity.unit must match. (Note that Coding with only a display is strongly discouraged.) If there is a match on code and system, but no match on display/unit, systems MAY raise a warning. However, because of translation and bandwidth considerations, some systems MAY opt to drop the unit or express it in an alternate language.

                                    Control0..*
                                    TypeExtension(QuestionnaireResponse Unit Option) (Extension Type: Coding)
                                    Is Modifierfalse
                                    Must Supporttrue
                                    Summaryfalse
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    126. Questionnaire.item.extension:unitValueSet
                                    Slice NameunitValueSet
                                    Definition

                                    A set of units that the user may choose when providing a quantity value.

                                    ShortUnit choices
                                    Comments

                                    Provide either unitOption(s) or unitValueSet. If either of the extensions are present, the units for a Quantity element are constrained to only the units listed by the extensions - i.e. it is treated as a "required", not an "extensible" binding. In the absence of either, any unit is valid. See additional guidance and examples in the SDC implementation guide. If this extension present and an answer is provided for the question item in the QuestionnaireResponse, then the valueQuantity SHALL have a Quantity.code and Quantity.system that match the Coding.code and system of one of the allowed values if the Coding has a code and/or system. If the Coding only has a display, then the Quantity.unit must match. (Note that Coding with only a display is strongly discouraged.) If there is a match on code and system, but no match on display/unit, systems MAY raise a warning. However, because of translation and bandwidth considerations, some systems MAY opt to drop the unit or express it in an alternate language. Validation of the Quantity unit MAY be performed by using the $validateCode operation, populating the elements passed into the operation from the Quantity.code, system and unit elements.

                                    Control0..1
                                    TypeExtension(QuestionnaireResponse Unit ValueSet) (Extension Type: canonical(ValueSet))
                                    Is Modifierfalse
                                    Must Supporttrue
                                    Summaryfalse
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    128. Questionnaire.item.extension:unitOpen
                                    Slice NameunitOpen
                                    Definition

                                    Indicates whether the list of supported units (conveyed in other extensions) are the exhaustive list from which the user must choose or whether they're able to select alternate codes or specify a string.

                                    ShortUsed to denote if user can specify alternate codes
                                    Control0..1
                                    TypeExtension(Units open?) (Extension Type: code)
                                    Is Modifierfalse
                                    Summaryfalse
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    130. Questionnaire.item.extension:unitSupplementalSystem
                                    Slice NameunitSupplementalSystem
                                    Definition

                                    If the questionnaire-unit-open extension indicates that additional units other than the set of options provided for the question are allowed, this indicates the code system those units are expected to be drawn from. This extension SHOULD be present on any question where questionare-unit-open allows additional coded values.

                                    ShortThis extension indicates the code system the additional units are drawn from
                                    Control0..1
                                    TypeExtension(Code system for other units) (Extension Type: canonical)
                                    Is Modifierfalse
                                    Summaryfalse
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    132. Questionnaire.item.extension:allowedResource
                                    Slice NameallowedResource
                                    Definition

                                    Where the type for a question is "Reference", indicates a type of resource that is permitted.

                                    ShortAllowed resource for reference
                                    Comments

                                    This extension only has meaning if the question.type = Reference. If no allowedResource extensions are present, the presumption is that any type of resource is permitted. If multiple are present, then any of the specified types are permitted. See additional guidance and examples in the SDC implementation guide.

                                    Control0..*
                                    TypeExtension(Questionnaire Reference Resource) (Extension Type: code)
                                    Is Modifierfalse
                                    Must Supporttrue
                                    Summaryfalse
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    134. Questionnaire.item.extension:allowedProfile
                                    Slice NameallowedProfile
                                    Definition

                                    Where the type for a question is "Reference", indicates a profile that the resource instances pointed to in answers to this question must be valid against.

                                    ShortAllowed profile for reference
                                    Comments

                                    If multiple profiles are present, then the resource must be valid against at least one of them. See additional guidance and examples in the SDC implementation guide.

                                    Control0..*
                                    TypeExtension(Questionnaire Reference Profile) (Extension Type: canonical(StructureDefinition))
                                    Is Modifierfalse
                                    Summaryfalse
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    136. Questionnaire.item.extension:candidateExpression
                                    Slice NamecandidateExpression
                                    Definition

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

                                    ShortExpression for possible answers
                                    Comments

                                    The results of the expression must correspond to the item type of the question the element appears on or must correspond to a resource, backbone element or complex data type for a group item. Resources are considered a match for the Reference item type. Quantity can be a match for decimal and integer items so long as a questionnaire-unit extension is present. If the expression returns coded data, it *SHALL return the information as either code or Coding, not CodeableConcept. If the expression returns elements of type 'code', when the user selects one or more candidates, the code will be matched against the allowed Codings (from answerValueSet, answerOptions, or answerExpresssion). In this case, it is an error if there is more than one Coding with the same code.

                                    Control0..1
                                    TypeExtension(Candidate Answers Expression) (Extension Type: Expression)
                                    Is Modifierfalse
                                    Summaryfalse
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    138. Questionnaire.item.extension:lookupQuestionnaire
                                    Slice NamelookupQuestionnaire
                                    Definition

                                    For items of type reference, the reference can be populated either by picking an existing entity or by creating a new one. In the latter case, this Questionnaire allows specifying the Questionnaire to use in creating the target instance. Typically this will result in a QuestionnaireResponse that can be extracted to produce the desired resource. However, if the target resource for the reference is a QuestionnaireResponse, then the QuestionnaireResponse resulting from the Questionnaire can be referenced directly.

                                    ShortQuestionnaire to populate a reference
                                    Control0..1
                                    TypeExtension(Lookup questionnaire) (Extension Type: canonical)
                                    Is Modifierfalse
                                    Summaryfalse
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    140. Questionnaire.item.extension:itemConstraint
                                    Slice NameitemConstraint
                                    Definition

                                    Specifies a constraint that is enforced on instantiated (or target) resources. This extension can be applied to definitional resources (such as ActivityDefinition or Measure) and indicates that the constraint should be enforced on resources that are instantiated from the definition.

                                    ShortA constraint on the target resource
                                    Comments

                                    Can be used on any definitional artifact to define a constraint that is enforced in the context of an instantiated resource. The constraint expression will have access to %target and %definition variables, where target is the instantiated resource, and definition is the definition used to instantiate.

                                    Control0..*
                                    TypeExtension(Target Constraint) (Complex Extension)
                                    Is Modifierfalse
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    142. Questionnaire.item.extension:initialExpression
                                    Slice NameinitialExpression
                                    Definition

                                    Initial value for a question answer as determined by an evaluated expression.

                                    ShortExpression-determined initial value
                                    Comments

                                    Initial value is only calculated at the time the QuestionnaireResponse is first generated. If the expression returns coded data, it *SHALL return the information as either code or Coding, not CodeableConcept. If the expression returns elements of type 'code', when the user selects one or more candidates, the code will be matched against the allowed Codings (from answerValueSet, answerOptions, or answerExpression). In this case, it is an error if there is more than one Coding with the same code.

                                    Control0..1
                                    TypeExtension(Initial Expression) (Extension Type: Expression)
                                    Is Modifierfalse
                                    Summaryfalse
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    144. Questionnaire.item.extension:calculatedExpression
                                    Slice NamecalculatedExpression
                                    Definition

                                    Calculated value for a question answer as determined by an evaluated expression.

                                    ShortExpression-determined initial value
                                    Comments

                                    Calculated value is updated as other answers in the QuestionnaireResponse are filled in.

                                    Control0..1
                                    TypeExtension(Calculated Expression) (Extension Type: Expression)
                                    Is Modifierfalse
                                    Summaryfalse
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    146. Questionnaire.item.extension:enableWhenExpression
                                    Slice NameenableWhenExpression
                                    Definition

                                    An expression that returns a boolean value for whether to enable the item.

                                    ShortExpression for when to enable the item
                                    Comments

                                    This is only permitted when the containing item does NOT have any enableWhen elements.

                                    If the expression involves comparisons between elements that have different precisions but are otherwise equal, FHIRPath will resolve the expression to an empty set, which will in turn evaluate to false (meaning the item won't be enabled). If this is not the desired behavior, the author should add a .allTrue() to the end of the expression, which will result in an indeterminate outcome because of precision differences being handled as 'true' and the item being enabled. Questionnaires SHOULD be designed to take into account challenges around varying precision to minimize non-deterministic situations by setting constraints around expected precision, etc.

                                    If the expression evaluates to something other than a boolean true or false, the Form Filler SHOULD still display the form, and if it does so, SHOULD treat the element as 'enabled' and display a warning to the user that the questionnaire logic was faulty and it's possible that the item shouldn't be enabled.

                                    Control0..1
                                    TypeExtension(Enable when expression) (Extension Type: Expression)
                                    Is Modifierfalse
                                    Must Supporttrue
                                    Summaryfalse
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    148. Questionnaire.item.extension:keyboardType
                                    Slice NamekeyboardType
                                    Definition

                                    For string or text items, indicates the 'keyboard type' that should be used by the user interface to guide entry.

                                    ShortKeyboard Type
                                    Comments

                                    The assertion applies on a per item basis and is not inherited. If the item is 'text', only 'chat' should be declared if this extension is present.

                                    Control0..1
                                    TypeExtension(Keyboard Type Extension) (Extension Type: Coding)
                                    Is Modifierfalse
                                    Summaryfalse
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    150. Questionnaire.item.modifierExtension
                                    Definition

                                    May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                                    Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

                                    ShortExtensions that cannot be ignored even if unrecognized
                                    Comments

                                    There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                    Control0..*
                                    TypeExtension
                                    Is Modifiertrue because Modifier extensions are expected to modify the meaning or interpretation of the element that contains them
                                    Summarytrue
                                    Requirements

                                    Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

                                    Alternate Namesextensions, user content, modifiers
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    152. Questionnaire.item.linkId
                                    Definition

                                    An identifier that is unique within the Questionnaire allowing linkage to the equivalent item in a QuestionnaireResponse resource.

                                    ShortUnique id for item in questionnaire
                                    Comments

                                    This ''can'' be a meaningful identifier (e.g. a LOINC code) but is not intended to have any meaning. GUIDs or sequential numbers are appropriate here.

                                    Control1..1
                                    Typestring
                                    Is Modifierfalse
                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                    Must Supporttrue
                                    Summaryfalse
                                    Requirements

                                    QuestionnaireResponse does not require omitted items to be included and may have some items that repeat, so linkage based on position alone is not sufficient.


                                    QuestionnaireResponse does not require omitted items to be included and may have some items that repeat, so linkage based on position alone is not sufficient.

                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    que-15: Link ids must be 255 characters or less ($this.length() <= 255)
                                    154. Questionnaire.item.prefix
                                    Definition

                                    A short label for a particular group, question or set of display text within the questionnaire used for reference by the individual completing the questionnaire.

                                    ShortE.g. "1(a)", "2.5.3"
                                    Comments

                                    These are generally unique within a questionnaire, though this is not guaranteed. Some questionnaires may have multiple questions with the same label with logic to control which gets exposed. Typically, these won't be used for "display" items, though such use is not prohibited. Systems SHOULD NOT generate their own prefixes if prefixes are defined for any items within a Questionnaire.

                                    Control0..1
                                    Typestring
                                    Is Modifierfalse
                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                    Must Supporttrue
                                    Summaryfalse
                                    Requirements

                                    Separating the label from the question text allows improved rendering. Also, instructions will often refer to specific prefixes, so there's a need for the questionnaire design to have control over what labels are used.

                                    Alternate Nameslabel
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    156. Questionnaire.item.type
                                    Definition

                                    The type of questionnaire item this is - whether text for display, a grouping of other items or a particular type of data to be captured (string, integer, coded choice, etc.).

                                    Shortgroup | display | boolean | decimal | integer | date | dateTime +
                                    Comments

                                    Time is handled using "string". File is handled using Attachment. (Content can be sent as a contained binary).


                                    Additional constraints on the type of answer can be conveyed by extensions. The value may come from the ElementDefinition referred to by .definition.

                                    Control1..1
                                    BindingThe codes SHALL be taken from QuestionnaireItemTypehttp://hl7.org/fhir/ValueSet/item-type|4.0.1
                                    (required to http://hl7.org/fhir/ValueSet/item-type|4.0.1)

                                    Distinguishes groups from questions and display text and indicates data type for questions.

                                    Typecode
                                    Is Modifierfalse
                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                    Must Supporttrue
                                    Summaryfalse
                                    Requirements

                                    Defines the format in which the user is to be prompted for the answer.

                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    158. Questionnaire.item.enableWhen
                                    Definition

                                    A constraint indicating that this item should only be enabled (displayed/allow answers to be captured) when the specified condition is true.

                                    ShortOnly allow data when
                                    Comments

                                    If multiple repetitions of this extension are present, the item should be enabled when the condition for any of the repetitions is true. I.e. treat "enableWhen"s as being joined by an "or" clause. This element is a modifier because if enableWhen is present for an item, "required" is ignored unless one of the enableWhen conditions is met. When an item is disabled, all of its descendants are disabled, regardless of what their own enableWhen logic might evaluate to.

                                    Control0..*
                                    TypeBackboneElement
                                    Is Modifiertrue because If enableWhen is present and the condition evaluates to false, then the Questionnaire behaves as though the elements weren't actually present
                                    Summaryfalse
                                    Requirements

                                    Allows questionnaires to adapt based on answers to other questions. E.g. If physical gender is specified as a male, no need to capture pregnancy history. Also allows conditional display of instructions or groups of questions.

                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    que-7: If the operator is 'exists', the value must be a boolean (operator = 'exists' implies (answer is Boolean))
                                    que-7: If the operator is 'exists', the value must be a boolean (operator = 'exists' implies (answer is Boolean))
                                    160. Questionnaire.item.enableWhen.modifierExtension
                                    Definition

                                    May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                                    Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

                                    ShortExtensions that cannot be ignored even if unrecognized
                                    Comments

                                    There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                    Control0..*
                                    TypeExtension
                                    Is Modifiertrue because Modifier extensions are expected to modify the meaning or interpretation of the element that contains them
                                    Summarytrue
                                    Requirements

                                    Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

                                    Alternate Namesextensions, user content, modifiers
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    162. Questionnaire.item.enableWhen.question
                                    Definition

                                    The linkId for the question whose answer (or lack of answer) governs whether this item is enabled.

                                    ShortQuestion that determines whether item is enabled
                                    Comments

                                    If multiple question occurrences are present for the same question (same linkId), then this refers to the nearest question occurrence reachable by tracing first the "ancestor" axis and then the "preceding" axis and then the "following" axis.

                                    Control1..1
                                    Typestring
                                    Is Modifierfalse
                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                    Must Supporttrue
                                    Summaryfalse
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    164. Questionnaire.item.enableWhen.operator
                                    Definition

                                    Specifies the criteria by which the question is enabled.

                                    Shortexists | = | != | > | < | >= | <=
                                    Control1..1
                                    BindingThe codes SHALL be taken from QuestionnaireItemOperatorhttp://hl7.org/fhir/ValueSet/questionnaire-enable-operator|4.0.1
                                    (required to http://hl7.org/fhir/ValueSet/questionnaire-enable-operator|4.0.1)

                                    The criteria by which a question is enabled.

                                    Typecode
                                    Is Modifierfalse
                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                    Must Supporttrue
                                    Summaryfalse
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    166. Questionnaire.item.enableWhen.answer[x]
                                    Definition

                                    A value that the referenced question is tested using the specified operator in order for the item to be enabled.

                                    ShortValue for question comparison based on operator
                                    Control1..1
                                    This element is affected by the following invariants: que-7
                                    BindingFor example codes, see QuestionnaireAnswerCodeshttp://hl7.org/fhir/ValueSet/questionnaire-answers
                                    (example to http://hl7.org/fhir/ValueSet/questionnaire-answers)

                                    Allowed values to answer questions.

                                    TypeChoice of: boolean, decimal, integer, date, dateTime, time, string, Coding, Quantity, Reference(Resource)
                                    [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                                    Is Modifierfalse
                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                    Must Supporttrue
                                    Must Support TypesNo must-support rules about the choice of types/profiles
                                    Summaryfalse
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    168. Questionnaire.item.enableBehavior
                                    Definition

                                    Controls how multiple enableWhen values are interpreted - whether all or any must be true.

                                    Shortall | any
                                    Comments

                                    This element must be specified if more than one enableWhen value is provided.

                                    Control0..1
                                    This element is affected by the following invariants: que-12
                                    BindingThe codes SHALL be taken from EnableWhenBehaviorhttp://hl7.org/fhir/ValueSet/questionnaire-enable-behavior|4.0.1
                                    (required to http://hl7.org/fhir/ValueSet/questionnaire-enable-behavior|4.0.1)

                                    Controls how multiple enableWhen values are interpreted - whether all or any must be true.

                                    Typecode
                                    Is Modifierfalse
                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                    Must Supporttrue
                                    Summaryfalse
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    170. Questionnaire.item.required
                                    Definition

                                    An indication, if true, that the item must be present in a "completed" QuestionnaireResponse. If false, the item may be skipped when answering the questionnaire.

                                    ShortWhether the item must be included in data results
                                    Comments

                                    Questionnaire.item.required only has meaning for elements that are conditionally enabled with enableWhen if the condition evaluates to true. If an item that contains other items is marked as required, that does not automatically make the contained elements required (though required groups must contain at least one child element). The value may come from the ElementDefinition referred to by .definition.

                                    Control0..1
                                    This element is affected by the following invariants: que-6
                                    Typeboolean
                                    Is Modifierfalse
                                    Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                    Must Supporttrue
                                    Summaryfalse
                                    Meaning if MissingItems are generally assumed not to be required unless explicitly specified. Systems SHOULD always populate this value
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    172. Questionnaire.item.required.value
                                    Definition

                                    The actual value

                                    ShortPrimitive value for boolean
                                    Control0..1
                                    Typeboolean
                                    Is Modifierfalse
                                    XML FormatIn the XML format, this property is represented as an attribute.
                                    Summaryfalse
                                    174. Questionnaire.item.required.value.extension
                                    Definition

                                    An Extension


                                    May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                    ShortExtensionAdditional content defined by implementations
                                    Comments

                                    There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                    Control0..*
                                    TypeExtension
                                    Is Modifierfalse
                                    Summaryfalse
                                    Alternate Namesextensions, user content
                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                    SlicingThis element introduces a set of slices on Questionnaire.item.required.value.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                    • value @ url
                                    • 176. Questionnaire.item.required.value.extension:requiredExpression
                                      Slice NamerequiredExpression
                                      Definition

                                      An expression that, when evaluated, provides the value for the element on which it appears.

                                      ShortAn dynamic expression
                                      Comments

                                      For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                      Control0..1
                                      TypeExtension(CQF Expression) (Extension Type: Expression)
                                      Is Modifierfalse
                                      Must Supporttrue
                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                      ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                      ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                      ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                      178. Questionnaire.item.repeats
                                      Definition

                                      An indication, if true, that a QuestionnaireResponse for this item may include multiple answers associated with a single instance of this item (for question-type items) or multiple repetitions of the item (for group-type items)


                                      An indication, if true, that the item may occur multiple times in the response, collecting multiple answers for questions or multiple sets of answers for groups.

                                      ShortWhether the item may repeat
                                      Comments

                                      If a question is marked as repeats=true, then multiple answers can be provided for the question in the corresponding QuestionnaireResponse. When rendering the questionnaire, it is up to the rendering software whether to render the question text for each answer repetition (i.e. "repeat the question") or to simply allow entry/selection of multiple answers for the question (repeat the answers). Which is most appropriate visually may depend on the type of answer as well as whether there are nested items.

                                      The resulting QuestionnaireResponse will be populated the same way regardless of rendering - one 'question' item with multiple answer values.

                                      The value may come from the ElementDefinition referred to by .definition.

                                      Control0..1
                                      This element is affected by the following invariants: que-6
                                      Typeboolean
                                      Is Modifierfalse
                                      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                      Must Supporttrue
                                      Summaryfalse
                                      Requirements

                                      Items may be used to create set of (related) questions that can be repeated to give multiple answers to such a set.

                                      Meaning if MissingItems are generally assumed not to repeat unless explicitly specified. Systems SHOULD always populate this value
                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                      180. Questionnaire.item.repeats.value
                                      Definition

                                      The actual value

                                      ShortPrimitive value for boolean
                                      Control0..1
                                      Typeboolean
                                      Is Modifierfalse
                                      XML FormatIn the XML format, this property is represented as an attribute.
                                      Summaryfalse
                                      182. Questionnaire.item.repeats.value.extension
                                      Definition

                                      An Extension


                                      May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                      ShortExtensionAdditional content defined by implementations
                                      Comments

                                      There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                      Control0..*
                                      TypeExtension
                                      Is Modifierfalse
                                      Summaryfalse
                                      Alternate Namesextensions, user content
                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                      ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                      ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                      SlicingThis element introduces a set of slices on Questionnaire.item.repeats.value.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                      • value @ url
                                      • 184. Questionnaire.item.repeats.value.extension:repeatsExpression
                                        Slice NamerepeatsExpression
                                        Definition

                                        An expression that, when evaluated, provides the value for the element on which it appears.

                                        ShortAn dynamic expression
                                        Comments

                                        For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                        Control0..1
                                        TypeExtension(CQF Expression) (Extension Type: Expression)
                                        Is Modifierfalse
                                        Must Supporttrue
                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                        ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                        186. Questionnaire.item.readOnly
                                        Definition

                                        An indication, when true, that the value cannot be changed by a human respondent to the Questionnaire.

                                        ShortDon't allow human editing
                                        Comments

                                        The value of readOnly elements can be established by asserting extensions for defaultValues, linkages that support pre-population and/or extensions that support calculation based on other answers.

                                        Control0..1
                                        This element is affected by the following invariants: que-9
                                        Typeboolean
                                        Is Modifierfalse
                                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                        Must Supporttrue
                                        Summaryfalse
                                        Requirements

                                        Allows certain information to be phrased (and rendered) as a question and an answer, while keeping users from changing it. May also be useful for preventing changes to pre-populated portions of a questionnaire, for calculated values, etc.

                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                        188. Questionnaire.item.readOnly.value
                                        Definition

                                        The actual value

                                        ShortPrimitive value for boolean
                                        Control0..1
                                        Typeboolean
                                        Is Modifierfalse
                                        XML FormatIn the XML format, this property is represented as an attribute.
                                        Summaryfalse
                                        190. Questionnaire.item.readOnly.value.extension
                                        Definition

                                        An Extension


                                        May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                        ShortExtensionAdditional content defined by implementations
                                        Comments

                                        There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                        Control0..*
                                        TypeExtension
                                        Is Modifierfalse
                                        Summaryfalse
                                        Alternate Namesextensions, user content
                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                        SlicingThis element introduces a set of slices on Questionnaire.item.readOnly.value.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                        • value @ url
                                        • 192. Questionnaire.item.readOnly.value.extension:readOnlyExpression
                                          Slice NamereadOnlyExpression
                                          Definition

                                          An expression that, when evaluated, provides the value for the element on which it appears.

                                          ShortAn dynamic expression
                                          Comments

                                          For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                          Control0..1
                                          TypeExtension(CQF Expression) (Extension Type: Expression)
                                          Is Modifierfalse
                                          Must Supporttrue
                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                          ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                          ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                          ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                          194. Questionnaire.item.answerValueSet
                                          Definition

                                          A reference to a value set containing a list of codes representing permitted answers for a "choice" or "open-choice" question.

                                          ShortValueset containing permitted answers
                                          Comments

                                          LOINC defines many useful value sets for questionnaire responses. See LOINC Answer Lists. The value may come from the ElementDefinition referred to by .definition.

                                          Control0..1
                                          This element is affected by the following invariants: que-4, que-5
                                          Typecanonical(SDC Value Set, ValueSet)
                                          Is Modifierfalse
                                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                          Summaryfalse
                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                          196. Questionnaire.item.answerValueSet.value
                                          Definition

                                          Primitive value for canonical


                                          The actual value

                                          ShortPrimitive value for canonicalPrimitive value for uri
                                          Control0..1
                                          Typestringuri
                                          Is Modifierfalse
                                          XML FormatIn the XML format, this property is represented as an attribute.
                                          Summaryfalse
                                          198. Questionnaire.item.answerValueSet.value.extension
                                          Definition

                                          An Extension


                                          May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                          ShortExtensionAdditional content defined by implementations
                                          Comments

                                          There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                          Control0..*
                                          TypeExtension
                                          Is Modifierfalse
                                          Summaryfalse
                                          Alternate Namesextensions, user content
                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                          ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                          ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                          SlicingThis element introduces a set of slices on Questionnaire.item.answerValueSet.value.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                          • value @ url
                                          • 200. Questionnaire.item.answerValueSet.value.extension:answerValueSetExpression
                                            Slice NameanswerValueSetExpression
                                            Definition

                                            An expression that, when evaluated, provides the value for the element on which it appears.

                                            ShortAn dynamic expression
                                            Comments

                                            For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                            Control0..1
                                            TypeExtension(CQF Expression) (Extension Type: Expression)
                                            Is Modifierfalse
                                            Must Supporttrue
                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                            ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                            202. Questionnaire.item.answerOption
                                            Definition

                                            One of the permitted answers for a "choice" or "open-choice" question.

                                            ShortPermitted answer
                                            Comments

                                            This element can be used when the value set machinery of answerValueSet is deemed too cumbersome or when there's a need to capture possible answers that are not codes.

                                            Control0..*
                                            This element is affected by the following invariants: que-4, que-5
                                            TypeBackboneElement
                                            Is Modifierfalse
                                            Must Supporttrue
                                            Summaryfalse
                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                            204. Questionnaire.item.answerOption.extension
                                            Definition

                                            An Extension


                                            May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                            ShortExtensionAdditional content defined by implementations
                                            Comments

                                            There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                            Control0..*
                                            TypeExtension
                                            Is Modifierfalse
                                            Summaryfalse
                                            Alternate Namesextensions, user content
                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                            SlicingThis element introduces a set of slices on Questionnaire.item.answerOption.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                            • value @ url
                                            • 206. Questionnaire.item.answerOption.extension:optionExclusive
                                              Slice NameoptionExclusive
                                              Definition

                                              If true, indicates that if this answerOption is selected, no other possible answers may be selected, even if the item is a repeating question.

                                              ShortOption is exclusive
                                              Comments

                                              See additional guidance and examples in the SDC implementation guide.

                                              Control0..1
                                              TypeExtension(Questionnaire Option Exclusive) (Extension Type: boolean)
                                              Is Modifierfalse
                                              Must Supporttrue
                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                              ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                              ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                              ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                              208. Questionnaire.item.answerOption.extension:itemWeight
                                              Slice NameitemWeight
                                              Definition

                                              A numeric value that allows the comparison (less than, greater than) or other numerical manipulation of a concept (e.g. Adding up components of a score). Scores are usually a whole number, but occasionally decimals are encountered in scores. In the CodeSystem and ValueSet resources, the item weight is represented using the itemWeight property

                                              ShortAssigned Ordinal Value
                                              Comments

                                              NOTE: questionnaire.item.answerOption can have a type of Coding, potentially allowing two different scopes for this extension. In the case where answerOption is available, the weight SHALL be declared on the answerOption rather than on the answerOption.valueCoding.

                                              Control0..1
                                              TypeExtension(Item Weight) (Extension Type: decimal)
                                              Is Modifierfalse
                                              Must Supporttrue
                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                              ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                              ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                              ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                              210. Questionnaire.item.answerOption.modifierExtension
                                              Definition

                                              May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                                              Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

                                              ShortExtensions that cannot be ignored even if unrecognized
                                              Comments

                                              There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                              Control0..*
                                              TypeExtension
                                              Is Modifiertrue because Modifier extensions are expected to modify the meaning or interpretation of the element that contains them
                                              Summarytrue
                                              Requirements

                                              Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

                                              Alternate Namesextensions, user content, modifiers
                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                              ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                              212. Questionnaire.item.answerOption.value[x]
                                              Definition

                                              A potential answer that's allowed as the answer to this question.

                                              ShortAnswer value
                                              Comments

                                              The data type of the value must agree with the item.type.

                                              Control1..1
                                              BindingFor example codes, see QuestionnaireAnswerCodeshttp://hl7.org/fhir/ValueSet/questionnaire-answers
                                              (example to http://hl7.org/fhir/ValueSet/questionnaire-answers)

                                              Allowed values to answer questions.

                                              TypeChoice of: integer, date, time, string, Coding, Reference(Resource)
                                              [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                                              Is Modifierfalse
                                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                              Must Supporttrue
                                              Must Support TypesNo must-support rules about the choice of types/profiles
                                              Summaryfalse
                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                              214. Questionnaire.item.initial
                                              Definition

                                              One or more values that should be pre-populated in the answer when initially rendering the questionnaire for user input.

                                              ShortInitial value(s) when item is first rendered
                                              Comments

                                              The user is allowed to change the value and override the default (unless marked as read-only). If the user doesn't change the value, then this initial value will be persisted when the QuestionnaireResponse is initially created. Note that initial values can influence results. The data type of initial[x] must agree with the item.type, and only repeating items can have more then one initial value.

                                              Control0..*
                                              This element is affected by the following invariants: que-8, que-13
                                              TypeBackboneElement
                                              Is Modifierfalse
                                              Must Supporttrue
                                              Summaryfalse
                                              Requirements

                                              In some workflows, having defaults saves time.

                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                              216. Questionnaire.item.initial.modifierExtension
                                              Definition

                                              May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                                              Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

                                              ShortExtensions that cannot be ignored even if unrecognized
                                              Comments

                                              There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                              Control0..*
                                              TypeExtension
                                              Is Modifiertrue because Modifier extensions are expected to modify the meaning or interpretation of the element that contains them
                                              Summarytrue
                                              Requirements

                                              Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

                                              Alternate Namesextensions, user content, modifiers
                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                              ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                              218. Questionnaire.item.initial.value[x]
                                              Definition

                                              The actual value to for an initial answer.

                                              ShortActual value for initializing the question
                                              Comments

                                              The type of the initial value must be consistent with the type of the item.

                                              Control1..1
                                              BindingFor example codes, see QuestionnaireAnswerCodeshttp://hl7.org/fhir/ValueSet/questionnaire-answers
                                              (example to http://hl7.org/fhir/ValueSet/questionnaire-answers)

                                              Allowed values to answer questions.

                                              TypeChoice of: boolean, decimal, integer, date, dateTime, time, string, uri, Attachment, Coding, Quantity, Reference(Resource)
                                              [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                                              Is Modifierfalse
                                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                              Must Supporttrue
                                              Must Support TypesNo must-support rules about the choice of types/profiles
                                              Summaryfalse
                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                              220. Questionnaire.item.item
                                              Definition

                                              Text, questions and other groups to be nested beneath a question or group.

                                              ShortNested questionnaire items
                                              Comments

                                              There is no specified limit to the depth of nesting. However, Questionnaire authors are encouraged to consider the impact on the user and user interface of overly deep nesting.

                                              Control0..*
                                              This element is affected by the following invariants: que-1
                                              TypeSeettp://hl7.org/fhir/StructureDefinition/Questionnaire#Questionnaire.item
                                              Is Modifierfalse
                                              Must Supporttrue
                                              Summaryfalse
                                              Requirements

                                              Reports can consist of complex nested groups.

                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))

                                              Guidance on how to interpret the contents of this table can be found here

                                              0. Questionnaire
                                              Definition

                                              Defines additional capabilities for controlling data entry and calculating values within the questionnaire.

                                              ShortAdvanced Behavior Questionnaire
                                              Control0..*
                                              Is Modifierfalse
                                              Summaryfalse
                                              Alternate NamesForm, CRF, Survey
                                              Invariantsdom-2: If the resource is contained in another resource, it SHALL NOT contain nested Resources (contained.contained.empty())
                                              dom-3: If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource (contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty())
                                              dom-4: If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated (contained.meta.versionId.empty() and contained.meta.lastUpdated.empty())
                                              dom-5: If a resource is contained in another resource, it SHALL NOT have a security label (contained.meta.security.empty())
                                              dom-6: A resource should have narrative for robust management (text.`div`.exists())
                                              que-0: Name should be usable as an identifier for the module by machine processing applications such as code generation (name.matches('[A-Z]([A-Za-z0-9_]){0,254}'))
                                              que-2: The link ids for groups and questions must be unique within the questionnaire (descendants().linkId.isDistinct())
                                              cnl-0: Name should be usable as an identifier for the module by machine processing applications such as code generation (name.exists() implies name.matches('^[A-Z]([A-Za-z0-9_]){1,254}$'))
                                              sdc-2: If version is present, versionAlgorithm must be present. (version.exists() implies extension.where(url='http://hl7.org/fhir/5.0/StructureDefinition/extension-Questionnaire.versionAlgorithm[x]').exists())
                                              sdc-3: Semver is the preferred version algorithm - package machinery doesn't work well with artifacts using alternate versioning schemes (extension.where(url='http://hl7.org/fhir/5.0/StructureDefinition/extension-Questionnaire.versionAlgorithm[x]').all(value.ofType(Coding).where(system='http://hl7.org/fhir/version-algorithm' and code='semver').exists()))
                                              2. Questionnaire.id
                                              Definition

                                              The logical id of the resource, as used in the URL for the resource. Once assigned, this value never changes.

                                              ShortLogical id of this artifact
                                              Comments

                                              The only time that a resource does not have an id is when it is being submitted to the server using a create operation.

                                              Control0..1
                                              Typeid
                                              Is Modifierfalse
                                              Summarytrue
                                              4. Questionnaire.meta
                                              Definition

                                              The metadata about the resource. This is content that is maintained by the infrastructure. Changes to the content might not always be associated with version changes to the resource.

                                              ShortMetadata about the resource
                                              Control0..1
                                              TypeMeta
                                              Is Modifierfalse
                                              Summarytrue
                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                              6. Questionnaire.implicitRules
                                              Definition

                                              A reference to a set of rules that were followed when the resource was constructed, and which must be understood when processing the content. Often, this is a reference to an implementation guide that defines the special rules along with other profiles etc.

                                              ShortA set of rules under which this content was created
                                              Comments

                                              Asserting this rule set restricts the content to be only understood by a limited set of trading partners. This inherently limits the usefulness of the data in the long term. However, the existing health eco-system is highly fractured, and not yet ready to define, collect, and exchange data in a generally computable sense. Wherever possible, implementers and/or specification writers should avoid using this element. Often, when used, the URL is a reference to an implementation guide that defines these special rules as part of it's narrative along with other profiles, value sets, etc.

                                              Control0..1
                                              Typeuri
                                              Is Modifiertrue because This element is labeled as a modifier because the implicit rules may provide additional knowledge about the resource that modifies it's meaning or interpretation
                                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                              Summarytrue
                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                              8. Questionnaire.language
                                              Definition

                                              The base language in which the resource is written.

                                              ShortLanguage of the resource content
                                              Comments

                                              Language is provided to support indexing and accessibility (typically, services such as text to speech use the language tag). The html language tag in the narrative applies to the narrative. The language tag on the resource may be used to specify the language of other presentations generated from the data in the resource. Not all the content has to be in the base language. The Resource.language should not be assumed to apply to the narrative automatically. If a language is specified, it should it also be specified on the div element in the html (see rules in HTML5 for information about the relationship between xml:lang and the html lang attribute).

                                              Control0..1
                                              BindingThe codes SHOULD be taken from CommonLanguages
                                              (preferred to http://hl7.org/fhir/ValueSet/languages)

                                              A human language.

                                              Additional BindingsPurpose
                                              AllLanguagesMax Binding
                                              Typecode
                                              Is Modifierfalse
                                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                              Summaryfalse
                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                              10. Questionnaire.text
                                              Definition

                                              A human-readable narrative that contains a summary of the resource and can be used to represent the content of the resource to a human. The narrative need not encode all the structured data, but is required to contain sufficient detail to make it "clinically safe" for a human to just read the narrative. Resource definitions may define what content should be represented in the narrative to ensure clinical safety.

                                              ShortText summary of the resource, for human interpretation
                                              Comments

                                              Contained resources do not have narrative. Resources that are not contained SHOULD have a narrative. In some cases, a resource may only have text with little or no additional discrete data (as long as all minOccurs=1 elements are satisfied). This may be necessary for data from legacy systems where information is captured as a "text blob" or where text is additionally entered raw or narrated and encoded information is added later.

                                              Control0..1
                                              TypeNarrative
                                              Is Modifierfalse
                                              Summaryfalse
                                              Alternate Namesnarrative, html, xhtml, display
                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                              12. Questionnaire.contained
                                              Definition

                                              These resources do not have an independent existence apart from the resource that contains them - they cannot be identified independently, and nor can they have their own independent transaction scope.

                                              ShortContained, inline Resources
                                              Comments

                                              This should never be done when the content can be identified properly, as once identification is lost, it is extremely difficult (and context dependent) to restore it again. Contained resources may have profiles and tags In their meta elements, but SHALL NOT have security labels.

                                              Control0..*
                                              TypeResource
                                              Is Modifierfalse
                                              Summaryfalse
                                              Alternate Namesinline resources, anonymous resources, contained resources
                                              14. Questionnaire.extension
                                              Definition

                                              An Extension

                                              ShortExtension
                                              Control0..*
                                              TypeExtension
                                              Is Modifierfalse
                                              Summaryfalse
                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                              ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                              SlicingThis element introduces a set of slices on Questionnaire.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                              • value @ url
                                              • 16. Questionnaire.extension:versionAlgorithm
                                                Slice NameversionAlgorithm
                                                Definition

                                                Optional Extension Element - found in all resources.

                                                ShortOptional Extensions Element
                                                Control0..1
                                                This element is affected by the following invariants: ele-1
                                                TypeExtension(Extension Definition for Questionnaire.versionAlgorithm[x] for Version 5.0) (Extension Type: Choice of: string, Coding)
                                                Is Modifierfalse
                                                Must Supporttrue
                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                18. Questionnaire.extension:copyrightLabel
                                                Slice NamecopyrightLabel
                                                Definition

                                                Optional Extension Element - found in all resources.

                                                ShortOptional Extensions Element
                                                Control0..1
                                                This element is affected by the following invariants: ele-1
                                                TypeExtension(Extension Definition for Questionnaire.copyrightLabel for Version 5.0) (Extension Type: string)
                                                Is Modifierfalse
                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                20. Questionnaire.extension:entryMode
                                                Slice NameentryMode
                                                Definition

                                                Indicates how questions within the questionnaire should be presented to the end-user. Specifically, differentiates whether the questions should be displayed one-at-a-time with no ability to adjust prior entries; one-at-a-time or continuously expanding where all questions up to the current question can be looked at and edited, or random, where all questions can be seen and the questions can be filled out in any order desired.

                                                Shortsequential | prior-edit | random
                                                Comments

                                                The prior-edit functionality can be accomplished by adding questions to the screen as each subsequent question is answered (resulting in all questions being displayed in a single screen) or with a view that shows only one question at a time but allows backward navigation to view and/or edit prior answers.

                                                Control0..*
                                                TypeExtension(Entry mode) (Extension Type: code)
                                                Is Modifierfalse
                                                Must Supporttrue
                                                Summaryfalse
                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                22. Questionnaire.extension:submissionEndpoint
                                                Slice NamesubmissionEndpoint
                                                Definition

                                                The base URL for the server to which questionnaire response associated with this questionnaire should be submitted. If multiple repetitions are present, the completed form should be sent to all listed endpoints.

                                                ShortWhere to send answers
                                                Comments

                                                Indicates that the form has been designed with an expectation that it will be submitted to the specified URI. If multiple endpoints are specified, expectation is that answers are submitted to all endpoints.

                                                If no end-point is specified, then the form is not exclusively designed to be submitted to a specific site. If and where the form needs to be submitted or how the form should be internally processed must be inferred from external context or system business rules.

                                                Endpoints may have expectations around authorization, etc. Some of this may be learned by consulting the CapabilityStatement associated with the endpoint.

                                                Control0..*
                                                TypeExtension(Endpoint) (Extension Type: uri)
                                                Is Modifierfalse
                                                Must Supporttrue
                                                Summaryfalse
                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                24. Questionnaire.extension:signatureRequired
                                                Slice NamesignatureRequired
                                                Definition

                                                Indicates that a signature (of the specified type) is needed when completing the QuestionnaireResponse.

                                                ShortIs signature needed?
                                                Comments

                                                If this appears at the Questionnaire level, then the signature will be gathered for the entire form when it is marked complete. If it appears on a particular item, then it will be gathered on that question or group when it is filled in. (E.g. seeking the user's initials beside certain questions.)

                                                The signature can be captured using the http://hl7.org/fhir/StructureDefinition/questionnaireresponse-signature extension. See additional guidance and examples in the SDC implementation guide.

                                                Control0..*
                                                TypeExtension(Questionnaire Signature Required) (Extension Type: CodeableConcept)
                                                Is Modifierfalse
                                                Summaryfalse
                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                26. Questionnaire.extension:constraint
                                                Slice Nameconstraint
                                                Definition

                                                Specifies a constraint that is enforced on instantiated (or target) resources. This extension can be applied to definitional resources (such as ActivityDefinition or Measure) and indicates that the constraint should be enforced on resources that are instantiated from the definition.

                                                ShortA constraint on the target resource
                                                Comments

                                                Can be used on any definitional artifact to define a constraint that is enforced in the context of an instantiated resource. The constraint expression will have access to %target and %definition variables, where target is the instantiated resource, and definition is the definition used to instantiate.

                                                Control0..*
                                                TypeExtension(Target Constraint) (Complex Extension)
                                                Is Modifierfalse
                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                28. Questionnaire.extension:library
                                                Slice Namelibrary
                                                Definition

                                                A reference to a library containing cql used in this Questionnaire.

                                                ShortA library containing logic used by the artifact
                                                Comments

                                                For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                                Control0..*
                                                TypeExtension(CQF Library) (Extension Type: canonical(Library))
                                                Is Modifierfalse
                                                Summaryfalse
                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                30. Questionnaire.extension:launchContext
                                                Slice NamelaunchContext
                                                Definition

                                                Resources that provide context for form processing logic (pre-population, flow-control, drop-down selection, etc.) when creating/displaying/editing a QuestionnaireResponse.

                                                ShortContext resources needed for Questionnaire
                                                Comments

                                                3 of these launch contexts are aligned with the existing SMART on FHIR "launch" contexts.

                                                Control0..*
                                                TypeExtension(Launch Contexts) (Complex Extension)
                                                Is Modifierfalse
                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                32. Questionnaire.extension:variable
                                                Slice Namevariable
                                                Definition

                                                Variable specifying a logic to generate a variable for use in subsequent logic. The name of the variable will be added to FHIRPath's context when processing descendants of the element that contains this extension as well as extensions within the same element.

                                                ShortVariable for processing
                                                Comments

                                                Ordering of variable extension declarations is significant as variables declared in one repetition of this extension might be used in subsequent extension repetitions

                                                For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                                Control0..*
                                                TypeExtension(Variable) (Extension Type: Expression)
                                                Is Modifierfalse
                                                Summaryfalse
                                                Requirements

                                                Allows variables to be calculated higher in the context of a QuestionnaireResponse for use with enableWhen-expression.

                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                34. Questionnaire.modifierExtension
                                                Definition

                                                An Extension

                                                ShortExtension
                                                Control0..*
                                                TypeExtension
                                                Is Modifiertrue because Modifier extensions are expected to modify the meaning or interpretation of the resource that contains them
                                                Summaryfalse
                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                SlicingThis element introduces a set of slices on Questionnaire.modifierExtension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                • value @ url
                                                • 36. Questionnaire.modifierExtension:rendering-criticalExtension
                                                  Slice Namerendering-criticalExtension
                                                  Definition

                                                  Indicates an extension that must be supported by the system presenting the instance for data capture or end-user consumption. If a system does not recognize the extension or cannot implement the functionality defined by the extension, it should display an error message or warning and refrain from presenting the instance to the user or using it when capturing data.

                                                  ShortExtension that must be supported
                                                  Comments

                                                  This may point to extensions that control the appearance of data elements, control what value elements have, what elements are or are not available, what elements can or cannot be edited, or rules about how editing may occur. This extension does NOT apply when simply rendering a resource for publication purposes or for other purposes not intended for end-user data capture or data consumption.

                                                  Control0..*
                                                  This element is affected by the following invariants: ele-1
                                                  TypeExtension(Rendering Critical Extension) (Extension Type: canonical)
                                                  Is Modifiertrue because Indicates that the Questionnaire can't be safely rendered in certain situations
                                                  Must Supporttrue
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                  38. Questionnaire.url
                                                  Definition

                                                  An absolute URI that is used to identify this questionnaire when it is referenced in a specification, model, design or an instance; also called its canonical identifier. This SHOULD be globally unique and SHOULD be a literal address at which at which an authoritative instance of this questionnaire is (or will be) published. This URL can be the target of a canonical reference. It SHALL remain the same when the questionnaire is stored on different servers.

                                                  ShortCanonical identifier for this questionnaire, represented as a URI (globally unique)
                                                  Comments

                                                  The name of the referenced questionnaire can be conveyed using the http://hl7.org/fhir/StructureDefinition/display extension.

                                                  Control0..1
                                                  Typeuri
                                                  Is Modifierfalse
                                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                  Summarytrue
                                                  Requirements

                                                  … This is the id that will be used to link a QuestionnaireResponse to the Questionnaire the response is for.

                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  cnl-1: Warning Questionnaire.url URL should not contain | or # - these characters make processing canonical references problematic (exists() implies matches('^[^|# ]+$'))
                                                  40. Questionnaire.identifier
                                                  Definition

                                                  A formal identifier that is used to identify this questionnaire when it is represented in other formats, or referenced in a specification, model, design or an instance.

                                                  ShortAdditional identifier for the questionnaire
                                                  Comments

                                                  Typically, this is used for identifiers that can go in an HL7 V3 II (instance identifier) data type, and can then identify this questionnaire outside of FHIR, where it is not possible to use the logical URI.

                                                  NoteThis is a business identifier, not a resource identifier (see discussion)
                                                  Control0..*
                                                  TypeIdentifier
                                                  Is Modifierfalse
                                                  Summarytrue
                                                  Requirements

                                                  Allows externally provided and/or usable business identifiers to be easily associated with the module.

                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  42. Questionnaire.version
                                                  Definition

                                                  The identifier that is used to identify this version of the questionnaire when it is referenced in a specification, model, design or instance. This is an arbitrary value managed by the questionnaire author and is not expected to be globally unique. For example, it might be a timestamp (e.g. yyyymmdd) if a managed version is not available. There is also no expectation that versions can be placed in a lexicographical sequence.

                                                  ShortBusiness version of the questionnaire
                                                  Comments

                                                  There may be different questionnaire instances that have the same identifier but different versions. The version can be appended to the url in a reference to allow a reference to a particular business version of the questionnaire with the format [url]|[version].

                                                  NoteThis is a business version Id, not a resource version Id (see discussion)
                                                  Control0..1
                                                  Typestring
                                                  Is Modifierfalse
                                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                  Summarytrue
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  44. Questionnaire.name
                                                  Definition

                                                  A natural language name identifying the questionnaire. This name should be usable as an identifier for the module by machine processing applications such as code generation.

                                                  ShortName for this questionnaire (computer friendly)
                                                  Comments

                                                  The name is not expected to be globally unique. The name should be a simple alphanumeric type name to ensure that it is machine-processing friendly.

                                                  Control0..1
                                                  This element is affected by the following invariants: inv-0
                                                  Typestring
                                                  Is Modifierfalse
                                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                  Summarytrue
                                                  Requirements

                                                  Support human navigation and code generation.

                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  46. Questionnaire.title
                                                  Definition

                                                  A short, descriptive, user-friendly title for the questionnaire.

                                                  ShortName for this questionnaire (human friendly)
                                                  Comments

                                                  This name does not need to be machine-processing friendly and may contain punctuation, white-space, etc.

                                                  Control0..1
                                                  Typestring
                                                  Is Modifierfalse
                                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                  Must Supporttrue
                                                  Summarytrue
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  48. Questionnaire.derivedFrom
                                                  Definition

                                                  The URL of a Questionnaire that this Questionnaire is based on.

                                                  ShortInstantiates protocol or definition
                                                  Control0..*
                                                  Typecanonical(Questionnaire)
                                                  Is Modifierfalse
                                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                  Summaryfalse
                                                  Requirements

                                                  Allows a Questionnaire to be created based on another Questionnaire.

                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  50. Questionnaire.status
                                                  Definition

                                                  The status of this questionnaire. Enables tracking the life-cycle of the content.

                                                  Shortdraft | active | retired | unknown
                                                  Comments

                                                  Allows filtering of questionnaires that are appropriate for use versus not.

                                                  Control1..1
                                                  BindingThe codes SHALL be taken from PublicationStatus
                                                  (required to http://hl7.org/fhir/ValueSet/publication-status|4.0.1)

                                                  The lifecycle status of an artifact.

                                                  Typecode
                                                  Is Modifiertrue because This is labeled as "Is Modifier" because applications should not use a retired {{title}} without due consideration
                                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                  Must Supporttrue
                                                  Summarytrue
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  52. Questionnaire.experimental
                                                  Definition

                                                  A Boolean value to indicate that this questionnaire is authored for testing purposes (or education/evaluation/marketing) and is not intended to be used for genuine usage.

                                                  ShortFor testing purposes, not real usage
                                                  Comments

                                                  Allows filtering of questionnaires that are appropriate for use versus not.

                                                  Control0..1
                                                  Typeboolean
                                                  Is Modifierfalse
                                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                  Summarytrue
                                                  Requirements

                                                  Enables experimental content to be developed following the same lifecycle that would be used for a production-level questionnaire.

                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  54. Questionnaire.subjectType
                                                  Definition

                                                  The types of subjects that can be the subject of responses created for the questionnaire.

                                                  ShortResource that can be subject of QuestionnaireResponse
                                                  Comments

                                                  If none are specified, then the subject is unlimited.

                                                  Control0..*
                                                  BindingThe codes SHALL be taken from ResourceType
                                                  (required to http://hl7.org/fhir/ValueSet/resource-types|4.0.1)

                                                  One of the resource types defined as part of this version of FHIR.

                                                  Typecode
                                                  Is Modifierfalse
                                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                  Summarytrue
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  56. Questionnaire.date
                                                  Definition

                                                  The date (and optionally time) when the questionnaire was published. The date must change when the business version changes and it must change if the status code changes. In addition, it should change when the substantive content of the questionnaire changes.

                                                  ShortDate last changed
                                                  Comments

                                                  Note that this is not the same as the resource last-modified-date, since the resource may be a secondary representation of the questionnaire. Additional specific dates may be added as extensions or be found by consulting Provenances associated with past versions of the resource.

                                                  Control0..1
                                                  TypedateTime
                                                  Is Modifierfalse
                                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                  Summarytrue
                                                  Alternate NamesRevision Date
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  58. Questionnaire.publisher
                                                  Definition

                                                  The name of the organization or individual that published the questionnaire.

                                                  ShortName of the publisher (organization or individual)
                                                  Comments

                                                  Usually an organization but may be an individual. The publisher (or steward) of the questionnaire is the organization or individual primarily responsible for the maintenance and upkeep of the questionnaire. This is not necessarily the same individual or organization that developed and initially authored the content. The publisher is the primary point of contact for questions or issues with the questionnaire. This item SHOULD be populated unless the information is available from context.

                                                  Control0..1
                                                  Typestring
                                                  Is Modifierfalse
                                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                  Summarytrue
                                                  Requirements

                                                  Helps establish the "authority/credibility" of the questionnaire. May also allow for contact.

                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  60. Questionnaire.contact
                                                  Definition

                                                  Contact details to assist a user in finding and communicating with the publisher.

                                                  ShortContact details for the publisher
                                                  Comments

                                                  May be a web site, an email address, a telephone number, etc.

                                                  Control0..*
                                                  TypeContactDetail
                                                  Is Modifierfalse
                                                  Summarytrue
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  62. Questionnaire.description
                                                  Definition

                                                  A free text natural language description of the questionnaire from a consumer's perspective.

                                                  ShortNatural language description of the questionnaire
                                                  Comments

                                                  This description can be used to capture details such as why the questionnaire was built, comments about misuse, instructions for clinical use and interpretation, literature references, examples from the paper world, etc. It is not a rendering of the questionnaire as conveyed in the 'text' field of the resource itself. This item SHOULD be populated unless the information is available from context (e.g. the language of the questionnaire is presumed to be the predominant language in the place the questionnaire was created).

                                                  Control0..1
                                                  Typemarkdown
                                                  Is Modifierfalse
                                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                  Summaryfalse
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  64. Questionnaire.useContext
                                                  Definition

                                                  The content was developed with a focus and intent of supporting the contexts that are listed. These contexts may be general categories (gender, age, ...) or may be references to specific programs (insurance plans, studies, ...) and may be used to assist with indexing and searching for appropriate questionnaire instances.

                                                  ShortThe context that the content is intended to support
                                                  Comments

                                                  When multiple useContexts are specified, there is no expectation that all or any of the contexts apply.

                                                  Control0..*
                                                  TypeUsageContext
                                                  Is Modifierfalse
                                                  Summarytrue
                                                  Requirements

                                                  Assist in searching for appropriate content.

                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  66. Questionnaire.jurisdiction
                                                  Definition

                                                  A legal or geographic region in which the questionnaire is intended to be used.

                                                  ShortIntended jurisdiction for questionnaire (if applicable)
                                                  Comments

                                                  It may be possible for the questionnaire to be used in jurisdictions other than those for which it was originally designed or intended.

                                                  Control0..*
                                                  BindingUnless not suitable, these codes SHALL be taken from Jurisdiction ValueSet
                                                  (extensible to http://hl7.org/fhir/ValueSet/jurisdiction)

                                                  Countries and regions within which this artifact is targeted for use.

                                                  TypeCodeableConcept
                                                  Is Modifierfalse
                                                  Summarytrue
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  68. Questionnaire.purpose
                                                  Definition

                                                  Explanation of why this questionnaire is needed and why it has been designed as it has.

                                                  ShortWhy this questionnaire is defined
                                                  Comments

                                                  This element does not describe the usage of the questionnaire. Instead, it provides traceability of ''why'' the resource is either needed or ''why'' it is defined as it is. This may be used to point to source materials or specifications that drove the structure of this questionnaire.

                                                  Control0..1
                                                  Typemarkdown
                                                  Is Modifierfalse
                                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                  Summaryfalse
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  70. Questionnaire.copyright
                                                  Definition

                                                  A copyright statement relating to the questionnaire and/or its contents. Copyright statements are generally legal restrictions on the use and publishing of the questionnaire.

                                                  ShortUse and/or publishing restrictions
                                                  Control0..1
                                                  Typemarkdown
                                                  Is Modifierfalse
                                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                  Summaryfalse
                                                  Requirements

                                                  Consumers must be able to determine any legal restrictions on the use of the questionnaire and/or its content.

                                                  Alternate NamesLicense, Restrictions
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  72. Questionnaire.approvalDate
                                                  Definition

                                                  The date on which the resource content was approved by the publisher. Approval happens once when the content is officially approved for usage.

                                                  ShortWhen the questionnaire was approved by publisher
                                                  Comments

                                                  The 'date' element may be more recent than the approval date because of minor changes or editorial corrections.

                                                  Control0..1
                                                  Typedate
                                                  Is Modifierfalse
                                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                  Summaryfalse
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  74. Questionnaire.lastReviewDate
                                                  Definition

                                                  The date on which the resource content was last reviewed. Review happens periodically after approval but does not change the original approval date.

                                                  ShortWhen the questionnaire was last reviewed
                                                  Comments

                                                  If specified, this date follows the original approval date.

                                                  Control0..1
                                                  Typedate
                                                  Is Modifierfalse
                                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                  Summaryfalse
                                                  Requirements

                                                  Gives a sense of how "current" the content is. Resources that have not been reviewed in a long time may have a risk of being less appropriate/relevant.

                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  76. Questionnaire.effectivePeriod
                                                  Definition

                                                  The period during which the questionnaire content was or is planned to be in active use.

                                                  ShortWhen the questionnaire is expected to be used
                                                  Comments

                                                  The effective period for a questionnaire determines when the content is applicable for usage and is independent of publication and review dates. For example, a measure intended to be used for the year 2016 might be published in 2015.

                                                  Control0..1
                                                  TypePeriod
                                                  Is Modifierfalse
                                                  Summarytrue
                                                  Requirements

                                                  Allows establishing a transition before a resource comes into effect and also allows for a sunsetting process when new versions of the questionnaire are or are expected to be used instead.

                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  78. Questionnaire.code
                                                  Definition

                                                  An identifier for this question or group of questions in a particular terminology such as LOINC.

                                                  ShortConcept that represents the overall questionnaire
                                                  Control0..*
                                                  BindingFor example codes, see QuestionnaireQuestionCodes
                                                  (example to http://hl7.org/fhir/ValueSet/questionnaire-questions)

                                                  Codes for questionnaires, groups and individual questions.

                                                  TypeCoding
                                                  Is Modifierfalse
                                                  Summarytrue
                                                  Requirements

                                                  Allows linking of the complete Questionnaire resources to formal terminologies. It's common for "panels" of questions to be identified by a code.

                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  80. Questionnaire.item
                                                  Definition

                                                  A particular question, question grouping or display text that is part of the questionnaire.

                                                  ShortQuestions and sections within the Questionnaire
                                                  Comments

                                                  The content of the questionnaire is constructed from an ordered, hierarchical collection of items.

                                                  Control0..*
                                                  This element is affected by the following invariants: que-3
                                                  TypeBackboneElement
                                                  Is Modifierfalse
                                                  Summaryfalse
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  que-1: Group items must have nested items, display items cannot have nested items ((type='group' implies item.empty().not()) and (type.trace('type')='display' implies item.trace('item').empty()))
                                                  que-3: Display items cannot have a "code" asserted (type!='display' or code.empty())
                                                  que-4: A question cannot have both answerOption and answerValueSet (answerOption.empty() or answerValueSet.empty())
                                                  que-5: Only 'choice' and 'open-choice' items can have answerValueSet ((type ='choice' or type = 'open-choice' or type = 'decimal' or type = 'integer' or type = 'date' or type = 'dateTime' or type = 'time' or type = 'string' or type = 'quantity') or (answerValueSet.empty() and answerOption.empty()))
                                                  que-6: Required and repeat aren't permitted for display items (type!='display' or (required.empty() and repeats.empty()))
                                                  que-8: Initial values can't be specified for groups or display items ((type!='group' and type!='display') or initial.empty())
                                                  que-9: Read-only can't be specified for "display" items (type!='display' or readOnly.empty())
                                                  que-10: Maximum length can only be declared for simple question types ((type in ('boolean' | 'decimal' | 'integer' | 'string' | 'text' | 'url' | 'open-choice')) or maxLength.empty())
                                                  que-11: If one or more answerOption is present, initial[x] must be missing (answerOption.empty() or initial.empty())
                                                  que-12: If there are more than one enableWhen, enableBehavior must be specified (enableWhen.count() > 2 implies enableBehavior.exists())
                                                  que-13: Can only have multiple initial values for repeating items (repeats=true or initial.count() <= 1)
                                                  sdc-1: An item cannot have an answerExpression if answerOption or answerValueSet is already present. (extension('http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-answerExpression').empty().not() implies (answerOption.empty() and answerValueSet.empty()))
                                                  que-1a: Group items must have nested items when Questionanire is complete ((type='group' and %resource.status='complete') implies item.empty().not())
                                                  que-1b: Groups should have items (type='group' implies item.empty().not())
                                                  que-1c: Display items cannot have child items (type='display' implies item.empty())
                                                  que-14: Can only have answerConstraint if answerOption, answerValueSet, or answerExpression are present. (This is a warning because other extensions may serve the same purpose) (extension('http://hl7.org/fhir/5.0/StructureDefinition/extension-Questionnaire.item.answerConstraint').exists() implies answerOption.exists() or answerValueSet.exists() or extension('http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-answerExpression').exists())
                                                  sdc-behave-2: An item cannot have both enableWhen and enableWhenExpression (enableWhen.empty() or extension('http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-enableWhenExpression').empty())
                                                  sdc-behave-1: An item cannot have both initial.value and initialExpression (initial.empty() or extension('http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-initialExpression').empty())
                                                  sdc-behave-3: For items of type 'quantity', it is best practice to include either a 'unitOption' or 'unitValueSet' extension to provide a list of valid units. ((type = 'quantity' implies (extension('http://hl7.org/fhir/StructureDefinition/questionnaire-unitOption').exists() or extension('http://hl7.org/fhir/StructureDefinition/questionnaire-unitValueSet').exists())) and (repeat(item).where(type = 'quantity')).all(extension('http://hl7.org/fhir/StructureDefinition/questionnaire-unitOption').exists() or extension('http://hl7.org/fhir/StructureDefinition/questionnaire-unitValueSet').exists()))
                                                  82. Questionnaire.item.id
                                                  Definition

                                                  Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                  ShortUnique id for inter-element referencing
                                                  Control0..1
                                                  Typestring
                                                  Is Modifierfalse
                                                  XML FormatIn the XML format, this property is represented as an attribute.
                                                  Summaryfalse
                                                  84. Questionnaire.item.extension
                                                  Definition

                                                  An Extension

                                                  ShortExtension
                                                  Control0..*
                                                  TypeExtension
                                                  Is Modifierfalse
                                                  Summaryfalse
                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                  SlicingThis element introduces a set of slices on Questionnaire.item.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                  • value @ url
                                                  • 86. Questionnaire.item.extension:hidden
                                                    Slice Namehidden
                                                    Definition

                                                    If true, indicates that the extended item should not be displayed to the user.

                                                    ShortDon't display to user
                                                    Comments

                                                    If an item is hidden, all descendant items are hidden as well. See additional guidance and examples in the SDC implementation guide.

                                                    Control0..1
                                                    TypeExtension(Questionnaire Hidden) (Extension Type: boolean)
                                                    Is Modifierfalse
                                                    Must Supporttrue
                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                    88. Questionnaire.item.extension:answerConstraint
                                                    Slice NameanswerConstraint
                                                    Definition

                                                    Optional Extension Element - found in all resources.

                                                    ShortOptional Extensions Element
                                                    Control0..1
                                                    This element is affected by the following invariants: ele-1
                                                    TypeExtension(Extension Definition for Questionnaire.item.answerConstraint for Version 5.0) (Extension Type: code)
                                                    Is Modifierfalse
                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                    90. Questionnaire.item.extension:disabledDisplay
                                                    Slice NamedisabledDisplay
                                                    Definition

                                                    Optional Extension Element - found in all resources.

                                                    ShortOptional Extensions Element
                                                    Control0..1
                                                    TypeExtension(Extension Definition for Questionnaire.item.disabledDisplay for Version 5.0) (Extension Type: code)
                                                    Is Modifierfalse
                                                    Summaryfalse
                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                    92. Questionnaire.item.extension:answerExpression
                                                    Slice NameanswerExpression
                                                    Definition

                                                    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.

                                                    ShortExpression for possible answers
                                                    Comments

                                                    This is only permitted when the containing item does NOT have any answerOption or answerValueSet elements. The results of the expression must correspond to the item type of the question the element appears on or must correspond to a resource, backbone element or complex data type for a group item. Resources are considered a match for the Reference item type. Quantity can be a match for decimal and integer items so long as a questionnaire-unit extension is present. If the result of an expression returns a code or codes, it SHALL return the results as Coding, not code or CodeableConcept.

                                                    Control0..1
                                                    TypeExtension(Answer Expression) (Extension Type: Expression)
                                                    Is Modifierfalse
                                                    Must Supporttrue
                                                    Summaryfalse
                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                    94. Questionnaire.item.extension:usageMode
                                                    Slice NameusageMode
                                                    Definition

                                                    Identifies that the specified element should only appear in certain "modes" of operation.

                                                    Shortcapture | display | display-non-empty | capture-display | capture-display-non-empty
                                                    Comments

                                                    See additional guidance and examples in the SDC implementation guide.

                                                    Control0..1
                                                    TypeExtension(QuestionnaireResponse Usage Mode) (Extension Type: code)
                                                    Is Modifierfalse
                                                    Must Supporttrue
                                                    Summaryfalse
                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                    96. Questionnaire.item.extension:itemSignatureRequired
                                                    Slice NameitemSignatureRequired
                                                    Definition

                                                    Indicates that a signature (of the specified type) is needed when completing the QuestionnaireResponse.

                                                    ShortIs signature needed?
                                                    Comments

                                                    If this appears at the Questionnaire level, then the signature will be gathered for the entire form when it is marked complete. If it appears on a particular item, then it will be gathered on that question or group when it is filled in. (E.g. seeking the user's initials beside certain questions.)

                                                    The signature can be captured using the http://hl7.org/fhir/StructureDefinition/questionnaireresponse-signature extension. See additional guidance and examples in the SDC implementation guide.

                                                    Control0..*
                                                    TypeExtension(Questionnaire Signature Required) (Extension Type: CodeableConcept)
                                                    Is Modifierfalse
                                                    Summaryfalse
                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                    98. Questionnaire.item.extension:itemMinOccurs
                                                    Slice NameitemMinOccurs
                                                    Definition

                                                    The minimum number of times the group must appear, or the minimum number of answers for a question - when greater than 1.

                                                    ShortMinimum repetitions
                                                    Comments

                                                    Default assumption for "required" elements is minOccurs=1. See additional guidance and examples in the SDC implementation guide.

                                                    Control0..1
                                                    TypeExtension(Questionnaire Min Occurs) (Extension Type: integer)
                                                    Is Modifierfalse
                                                    Must Supporttrue
                                                    Summaryfalse
                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                    100. Questionnaire.item.extension:itemMinOccurs.id
                                                    Definition

                                                    Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                    ShortUnique id for inter-element referencing
                                                    Control0..1
                                                    This element is affected by the following invariants: ele-1
                                                    Typeid
                                                    Is Modifierfalse
                                                    XML FormatIn the XML format, this property is represented as an attribute.
                                                    Summaryfalse
                                                    102. Questionnaire.item.extension:itemMinOccurs.extension
                                                    Definition

                                                    An Extension

                                                    ShortExtension
                                                    Control0..0
                                                    TypeExtension
                                                    Is Modifierfalse
                                                    Summaryfalse
                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                    SlicingThis element introduces a set of slices on Questionnaire.item.extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                    • value @ url
                                                    • 104. Questionnaire.item.extension:itemMinOccurs.url
                                                      Definition

                                                      Source of the definition for the extension code - a logical name or a URL.

                                                      Shortidentifies the meaning of the extension
                                                      Comments

                                                      The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.

                                                      Control1..1
                                                      Typeuri
                                                      Is Modifierfalse
                                                      XML FormatIn the XML format, this property is represented as an attribute.
                                                      Summaryfalse
                                                      Fixed Valuehttp://hl7.org/fhir/StructureDefinition/questionnaire-minOccurs
                                                      106. Questionnaire.item.extension:itemMinOccurs.value[x]
                                                      Definition

                                                      Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).

                                                      ShortValue of extension
                                                      Control1..1
                                                      This element is affected by the following invariants: ext-1
                                                      Typeinteger
                                                      [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                                                      Is Modifierfalse
                                                      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                      Must Supportfalse
                                                      Summaryfalse
                                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                      108. Questionnaire.item.extension:itemMinOccurs.value[x].id
                                                      Definition

                                                      unique id for the element within a resource (for internal references)

                                                      Shortxml:id (or equivalent in JSON)
                                                      Control0..1
                                                      Typestring
                                                      Is Modifierfalse
                                                      XML FormatIn the XML format, this property is represented as an attribute.
                                                      Summaryfalse
                                                      110. Questionnaire.item.extension:itemMinOccurs.value[x].extension
                                                      Definition

                                                      An Extension

                                                      ShortExtension
                                                      Control0..*
                                                      TypeExtension
                                                      Is Modifierfalse
                                                      Summaryfalse
                                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                      ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                      SlicingThis element introduces a set of slices on Questionnaire.item.extension.value[x].extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                      • value @ url
                                                      • 112. Questionnaire.item.extension:itemMinOccurs.value[x].extension:itemMinOccursExpression
                                                        Slice NameitemMinOccursExpression
                                                        Definition

                                                        An expression that, when evaluated, provides the value for the element on which it appears.

                                                        ShortAn dynamic expression
                                                        Comments

                                                        For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                                        Control0..1
                                                        TypeExtension(CQF Expression) (Extension Type: Expression)
                                                        Is Modifierfalse
                                                        Must Supporttrue
                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                        114. Questionnaire.item.extension:itemMinOccurs.value[x].value
                                                        Definition

                                                        The actual value

                                                        ShortPrimitive value for integer
                                                        Control0..1
                                                        Typeinteger
                                                        Is Modifierfalse
                                                        XML FormatIn the XML format, this property is represented as an attribute.
                                                        Summaryfalse
                                                        Min Value-2147483648
                                                        Max Value2147483647
                                                        116. Questionnaire.item.extension:itemMaxOccurs
                                                        Slice NameitemMaxOccurs
                                                        Definition

                                                        The maximum number of times the group must appear, or the maximum number of answers for a question - when greater than 1 and not unlimited.

                                                        ShortMaximum repetitions
                                                        Comments

                                                        Only relevant if the element has repeats=true and there's a need to constrain the number of allowed repetitions. See additional guidance and examples in the SDC implementation guide.

                                                        Control0..1
                                                        TypeExtension(Questionnaire Max Occurs) (Extension Type: integer)
                                                        Is Modifierfalse
                                                        Must Supporttrue
                                                        Summaryfalse
                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                        118. Questionnaire.item.extension:itemMaxOccurs.id
                                                        Definition

                                                        Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                        ShortUnique id for inter-element referencing
                                                        Control0..1
                                                        This element is affected by the following invariants: ele-1
                                                        Typeid
                                                        Is Modifierfalse
                                                        XML FormatIn the XML format, this property is represented as an attribute.
                                                        Summaryfalse
                                                        120. Questionnaire.item.extension:itemMaxOccurs.extension
                                                        Definition

                                                        An Extension

                                                        ShortExtension
                                                        Control0..0
                                                        TypeExtension
                                                        Is Modifierfalse
                                                        Summaryfalse
                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                        SlicingThis element introduces a set of slices on Questionnaire.item.extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                        • value @ url
                                                        • 122. Questionnaire.item.extension:itemMaxOccurs.url
                                                          Definition

                                                          Source of the definition for the extension code - a logical name or a URL.

                                                          Shortidentifies the meaning of the extension
                                                          Comments

                                                          The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.

                                                          Control1..1
                                                          Typeuri
                                                          Is Modifierfalse
                                                          XML FormatIn the XML format, this property is represented as an attribute.
                                                          Summaryfalse
                                                          Fixed Valuehttp://hl7.org/fhir/StructureDefinition/questionnaire-maxOccurs
                                                          124. Questionnaire.item.extension:itemMaxOccurs.value[x]
                                                          Definition

                                                          Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).

                                                          ShortValue of extension
                                                          Control1..1
                                                          This element is affected by the following invariants: ext-1
                                                          Typeinteger
                                                          [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                                                          Is Modifierfalse
                                                          Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                          Must Supportfalse
                                                          Summaryfalse
                                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                          126. Questionnaire.item.extension:itemMaxOccurs.value[x].id
                                                          Definition

                                                          unique id for the element within a resource (for internal references)

                                                          Shortxml:id (or equivalent in JSON)
                                                          Control0..1
                                                          Typestring
                                                          Is Modifierfalse
                                                          XML FormatIn the XML format, this property is represented as an attribute.
                                                          Summaryfalse
                                                          128. Questionnaire.item.extension:itemMaxOccurs.value[x].extension
                                                          Definition

                                                          An Extension

                                                          ShortExtension
                                                          Control0..*
                                                          TypeExtension
                                                          Is Modifierfalse
                                                          Summaryfalse
                                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                          ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                          SlicingThis element introduces a set of slices on Questionnaire.item.extension.value[x].extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                          • value @ url
                                                          • 130. Questionnaire.item.extension:itemMaxOccurs.value[x].extension:itemMaxOccursExpression
                                                            Slice NameitemMaxOccursExpression
                                                            Definition

                                                            An expression that, when evaluated, provides the value for the element on which it appears.

                                                            ShortAn dynamic expression
                                                            Comments

                                                            For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                                            Control0..1
                                                            TypeExtension(CQF Expression) (Extension Type: Expression)
                                                            Is Modifierfalse
                                                            Must Supporttrue
                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                            132. Questionnaire.item.extension:itemMaxOccurs.value[x].value
                                                            Definition

                                                            The actual value

                                                            ShortPrimitive value for integer
                                                            Control0..1
                                                            Typeinteger
                                                            Is Modifierfalse
                                                            XML FormatIn the XML format, this property is represented as an attribute.
                                                            Summaryfalse
                                                            Min Value-2147483648
                                                            Max Value2147483647
                                                            134. Questionnaire.item.extension:minLength
                                                            Slice NameminLength
                                                            Definition

                                                            The minimum number of characters that must be present in the simple data type to be considered a "valid" instance.

                                                            ShortAt least this many characters
                                                            Comments

                                                            For base64binary, reflects the number of characters representing the encoded data, not the number of bytes of the binary data. For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                                            Control0..1
                                                            TypeExtension(Min length) (Extension Type: integer)
                                                            Is Modifierfalse
                                                            Must Supporttrue
                                                            Summaryfalse
                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                            136. Questionnaire.item.extension:regex
                                                            Slice Nameregex
                                                            Definition

                                                            A regular expression that defines the syntax for the data element to be considered valid.

                                                            ShortRegular expression pattern
                                                            Control0..1
                                                            TypeExtension(regex) (Extension Type: string)
                                                            Is Modifierfalse
                                                            Must Supporttrue
                                                            Summaryfalse
                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                            138. Questionnaire.item.extension:minValue
                                                            Slice NameminValue
                                                            Definition

                                                            The inclusive lower bound on the range of allowed values for the data element.

                                                            ShortMust be >= this value
                                                            Comments

                                                            Data type specified must be the same as the data type for the data element. For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                                            Control0..1
                                                            TypeExtension(Min value) (Extension Type: Choice of: date, dateTime, time, decimal, integer, Quantity)
                                                            Is Modifierfalse
                                                            Must Supporttrue
                                                            Summaryfalse
                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                            140. Questionnaire.item.extension:minValue.id
                                                            Definition

                                                            Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                            ShortUnique id for inter-element referencing
                                                            Control0..1
                                                            This element is affected by the following invariants: ele-1
                                                            Typeid
                                                            Is Modifierfalse
                                                            XML FormatIn the XML format, this property is represented as an attribute.
                                                            Summaryfalse
                                                            142. Questionnaire.item.extension:minValue.extension
                                                            Definition

                                                            An Extension

                                                            ShortExtension
                                                            Control0..0
                                                            TypeExtension
                                                            Is Modifierfalse
                                                            Summaryfalse
                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                            SlicingThis element introduces a set of slices on Questionnaire.item.extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                            • value @ url
                                                            • 144. Questionnaire.item.extension:minValue.url
                                                              Definition

                                                              Source of the definition for the extension code - a logical name or a URL.

                                                              Shortidentifies the meaning of the extension
                                                              Comments

                                                              The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.

                                                              Control1..1
                                                              Typeuri
                                                              Is Modifierfalse
                                                              XML FormatIn the XML format, this property is represented as an attribute.
                                                              Summaryfalse
                                                              Fixed Valuehttp://hl7.org/fhir/StructureDefinition/minValue
                                                              146. Questionnaire.item.extension:minValue.value[x]
                                                              Definition

                                                              Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).

                                                              ShortValue of extension
                                                              Control1..1
                                                              This element is affected by the following invariants: ext-1
                                                              TypeChoice of: date, dateTime, time, decimal, integer, Quantity
                                                              [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                                                              Is Modifierfalse
                                                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                              Must Supportfalse
                                                              Summaryfalse
                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                              148. Questionnaire.item.extension:minValue.value[x].id
                                                              Definition

                                                              Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                              ShortUnique id for inter-element referencing
                                                              Control0..1
                                                              Typestring
                                                              Is Modifierfalse
                                                              XML FormatIn the XML format, this property is represented as an attribute.
                                                              Summaryfalse
                                                              150. Questionnaire.item.extension:minValue.value[x].extension
                                                              Definition

                                                              May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                                              ShortAdditional content defined by implementations
                                                              Comments

                                                              There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                              Control0..*
                                                              TypeExtension
                                                              Is Modifierfalse
                                                              Summaryfalse
                                                              Alternate Namesextensions, user content
                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                              ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                              SlicingThis element introduces a set of slices on Questionnaire.item.extension.value[x].extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                              • value @ url
                                                              • 152. Questionnaire.item.extension:minValue.value[x].extension:minValueCalculated
                                                                Slice NameminValueCalculated
                                                                Definition

                                                                An expression that determines a calculated value. The expression may be simply the name of a expression in a referenced library, or it may be a complete inline expression.

                                                                ShortA calculated value
                                                                Comments

                                                                For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                                                Control0..1
                                                                TypeExtension(Calculated value) (Extension Type: Expression)
                                                                Is Modifierfalse
                                                                Summaryfalse
                                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                154. Questionnaire.item.extension:maxValue
                                                                Slice NamemaxValue
                                                                Definition

                                                                The inclusive upper bound on the range of allowed values for the data element.

                                                                ShortMust be <= this value
                                                                Comments

                                                                Data type specified must be the same as the data type for the data element. For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                                                Control0..1
                                                                TypeExtension(Max value) (Extension Type: Choice of: date, dateTime, time, decimal, integer, Quantity)
                                                                Is Modifierfalse
                                                                Must Supporttrue
                                                                Summaryfalse
                                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                156. Questionnaire.item.extension:maxValue.id
                                                                Definition

                                                                Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                                ShortUnique id for inter-element referencing
                                                                Control0..1
                                                                This element is affected by the following invariants: ele-1
                                                                Typeid
                                                                Is Modifierfalse
                                                                XML FormatIn the XML format, this property is represented as an attribute.
                                                                Summaryfalse
                                                                158. Questionnaire.item.extension:maxValue.extension
                                                                Definition

                                                                An Extension

                                                                ShortExtension
                                                                Control0..0
                                                                TypeExtension
                                                                Is Modifierfalse
                                                                Summaryfalse
                                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                SlicingThis element introduces a set of slices on Questionnaire.item.extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                                • value @ url
                                                                • 160. Questionnaire.item.extension:maxValue.url
                                                                  Definition

                                                                  Source of the definition for the extension code - a logical name or a URL.

                                                                  Shortidentifies the meaning of the extension
                                                                  Comments

                                                                  The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.

                                                                  Control1..1
                                                                  Typeuri
                                                                  Is Modifierfalse
                                                                  XML FormatIn the XML format, this property is represented as an attribute.
                                                                  Summaryfalse
                                                                  Fixed Valuehttp://hl7.org/fhir/StructureDefinition/maxValue
                                                                  162. Questionnaire.item.extension:maxValue.value[x]
                                                                  Definition

                                                                  Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).

                                                                  ShortValue of extension
                                                                  Control1..1
                                                                  This element is affected by the following invariants: ext-1
                                                                  TypeChoice of: date, dateTime, time, decimal, integer, Quantity
                                                                  [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                                                                  Is Modifierfalse
                                                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                  Must Supportfalse
                                                                  Summaryfalse
                                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                  164. Questionnaire.item.extension:maxValue.value[x].id
                                                                  Definition

                                                                  Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                                  ShortUnique id for inter-element referencing
                                                                  Control0..1
                                                                  Typestring
                                                                  Is Modifierfalse
                                                                  XML FormatIn the XML format, this property is represented as an attribute.
                                                                  Summaryfalse
                                                                  166. Questionnaire.item.extension:maxValue.value[x].extension
                                                                  Definition

                                                                  May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                                                  ShortAdditional content defined by implementations
                                                                  Comments

                                                                  There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                                  Control0..*
                                                                  TypeExtension
                                                                  Is Modifierfalse
                                                                  Summaryfalse
                                                                  Alternate Namesextensions, user content
                                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                  SlicingThis element introduces a set of slices on Questionnaire.item.extension.value[x].extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                                  • value @ url
                                                                  • 168. Questionnaire.item.extension:maxValue.value[x].extension:maxValueCalculated
                                                                    Slice NamemaxValueCalculated
                                                                    Definition

                                                                    An expression that determines a calculated value. The expression may be simply the name of a expression in a referenced library, or it may be a complete inline expression.

                                                                    ShortA calculated value
                                                                    Comments

                                                                    For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                                                    Control0..1
                                                                    TypeExtension(Calculated value) (Extension Type: Expression)
                                                                    Is Modifierfalse
                                                                    Summaryfalse
                                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                    170. Questionnaire.item.extension:minQuantity
                                                                    Slice NameminQuantity
                                                                    Definition

                                                                    The inclusive lower bound on the range of allowed values for a 'quantity' type question. Open Issue: Revisit whether this should be folded into the regular minValue extension once there are better capabilities around defining conformance expectations regarding extensions.

                                                                    ShortMust be >= this value
                                                                    Comments

                                                                    This must only be used if the set of permitted units is constrained to UCUM codes and the minimum checks will be performed by converting the answer.valueQuantity to the same units as the minQuantity unit prior to comparison.

                                                                    Control0..1
                                                                    TypeExtension(Min quantity) (Extension Type: Quantity)
                                                                    Is Modifierfalse
                                                                    Must Supportfalse
                                                                    Summaryfalse
                                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                    172. Questionnaire.item.extension:minQuantity.id
                                                                    Definition

                                                                    Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                                    ShortUnique id for inter-element referencing
                                                                    Control0..1
                                                                    Typestring
                                                                    Is Modifierfalse
                                                                    XML FormatIn the XML format, this property is represented as an attribute.
                                                                    Summaryfalse
                                                                    174. Questionnaire.item.extension:minQuantity.extension
                                                                    Definition

                                                                    An Extension

                                                                    ShortExtension
                                                                    Control0..0
                                                                    TypeExtension
                                                                    Is Modifierfalse
                                                                    Summaryfalse
                                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                    SlicingThis element introduces a set of slices on Questionnaire.item.extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                                    • value @ url
                                                                    • 176. Questionnaire.item.extension:minQuantity.url
                                                                      Definition

                                                                      Source of the definition for the extension code - a logical name or a URL.

                                                                      Shortidentifies the meaning of the extension
                                                                      Comments

                                                                      The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.

                                                                      Control1..1
                                                                      Typeuri
                                                                      Is Modifierfalse
                                                                      XML FormatIn the XML format, this property is represented as an attribute.
                                                                      Summaryfalse
                                                                      Fixed Valuehttp://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-minQuantity
                                                                      178. Questionnaire.item.extension:minQuantity.value[x]
                                                                      Definition

                                                                      Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).

                                                                      ShortValue of extension
                                                                      Control0..1
                                                                      TypeQuantity
                                                                      [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                                                                      Is Modifierfalse
                                                                      Must Supportfalse
                                                                      Summaryfalse
                                                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                      180. Questionnaire.item.extension:minQuantity.value[x].id
                                                                      Definition

                                                                      Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                                      ShortUnique id for inter-element referencing
                                                                      Control0..1
                                                                      Typestring
                                                                      Is Modifierfalse
                                                                      XML FormatIn the XML format, this property is represented as an attribute.
                                                                      Summaryfalse
                                                                      182. Questionnaire.item.extension:minQuantity.value[x].extension
                                                                      Definition

                                                                      May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                                                      ShortAdditional content defined by implementations
                                                                      Comments

                                                                      There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                                      Control0..*
                                                                      TypeExtension
                                                                      Is Modifierfalse
                                                                      Summaryfalse
                                                                      Alternate Namesextensions, user content
                                                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                      ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                      SlicingThis element introduces a set of slices on Questionnaire.item.extension.value[x].extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                                      • value @ url
                                                                      • 184. Questionnaire.item.extension:minQuantity.value[x].extension:minQuantityCalculated
                                                                        Slice NameminQuantityCalculated
                                                                        Definition

                                                                        An expression that determines a calculated value. The expression may be simply the name of a expression in a referenced library, or it may be a complete inline expression.

                                                                        ShortA calculated value
                                                                        Comments

                                                                        For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                                                        Control0..1
                                                                        TypeExtension(Calculated value) (Extension Type: Expression)
                                                                        Is Modifierfalse
                                                                        Summaryfalse
                                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                        186. Questionnaire.item.extension:minQuantity.value[x].value
                                                                        Definition

                                                                        The value of the measured amount. The value includes an implicit precision in the presentation of the value.

                                                                        ShortNumerical value (with implicit precision)
                                                                        Comments

                                                                        The implicit precision in the value should always be honored. Monetary values have their own rules for handling precision (refer to standard accounting text books).

                                                                        Control0..1
                                                                        Typedecimal
                                                                        Is Modifierfalse
                                                                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                        Summarytrue
                                                                        Requirements

                                                                        Precision is handled implicitly in almost all cases of measurement.

                                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                        188. Questionnaire.item.extension:minQuantity.value[x].comparator
                                                                        Definition

                                                                        How the value should be understood and represented - whether the actual value is greater or less than the stated value due to measurement issues; e.g. if the comparator is "<" , then the real value is < stated value.

                                                                        Short< | <= | >= | > - how to understand the value
                                                                        Control0..1
                                                                        BindingThe codes SHALL be taken from QuantityComparator
                                                                        (required to http://hl7.org/fhir/ValueSet/quantity-comparator|4.0.1)

                                                                        How the Quantity should be understood and represented.

                                                                        Typecode
                                                                        Is Modifiertrue because This is labeled as "Is Modifier" because the comparator modifies the interpretation of the value significantly. If there is no comparator, then there is no modification of the value
                                                                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                        Summarytrue
                                                                        Requirements

                                                                        Need a framework for handling measures where the value is <5ug/L or >400mg/L due to the limitations of measuring methodology.

                                                                        Meaning if MissingIf there is no comparator, then there is no modification of the value
                                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                        190. Questionnaire.item.extension:minQuantity.value[x].unit
                                                                        Definition

                                                                        A human-readable form of the unit.

                                                                        ShortUnit representation
                                                                        Control0..1
                                                                        Typestring
                                                                        Is Modifierfalse
                                                                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                        Summarytrue
                                                                        Requirements

                                                                        There are many representations for units of measure and in many contexts, particular representations are fixed and required. I.e. mcg for micrograms.

                                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                        192. Questionnaire.item.extension:minQuantity.value[x].system
                                                                        Definition

                                                                        The identification of the system that provides the coded form of the unit.

                                                                        ShortSystem that defines coded unit form
                                                                        Control0..1
                                                                        This element is affected by the following invariants: qty-3
                                                                        Typeuri
                                                                        Is Modifierfalse
                                                                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                        Summarytrue
                                                                        Requirements

                                                                        Need to know the system that defines the coded form of the unit.

                                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                        194. Questionnaire.item.extension:minQuantity.value[x].code
                                                                        Definition

                                                                        A computer processable form of the unit in some unit representation system.

                                                                        ShortCoded form of the unit
                                                                        Comments

                                                                        The preferred system is UCUM, but SNOMED CT can also be used (for customary units) or ISO 4217 for currency. The context of use may additionally require a code from a particular system.

                                                                        Control0..1
                                                                        Typecode
                                                                        Is Modifierfalse
                                                                        Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                        Summarytrue
                                                                        Requirements

                                                                        Need a computable form of the unit that is fixed across all forms. UCUM provides this for quantities, but SNOMED CT provides many units of interest.

                                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                        196. Questionnaire.item.extension:maxQuantity
                                                                        Slice NamemaxQuantity
                                                                        Definition

                                                                        The inclusive upper bound on the range of allowed values for a 'quantity' type question. Open Issue: Revisit whether this should be folded into the regular maxValue extension once there are better capabilities around defining conformance expectations regarding extensions.

                                                                        ShortMust be <= this value
                                                                        Comments

                                                                        This must only be used if the set of permitted units is constrained to UCUM codes and the maximum checks will be performed by converting the answer.valueQuantity to the same units as the maxQuantity unit prior to comparison.

                                                                        Control0..1
                                                                        TypeExtension(Max quantity) (Extension Type: Quantity)
                                                                        Is Modifierfalse
                                                                        Must Supportfalse
                                                                        Summaryfalse
                                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                        198. Questionnaire.item.extension:maxQuantity.id
                                                                        Definition

                                                                        Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                                        ShortUnique id for inter-element referencing
                                                                        Control0..1
                                                                        Typestring
                                                                        Is Modifierfalse
                                                                        XML FormatIn the XML format, this property is represented as an attribute.
                                                                        Summaryfalse
                                                                        200. Questionnaire.item.extension:maxQuantity.extension
                                                                        Definition

                                                                        An Extension

                                                                        ShortExtension
                                                                        Control0..0
                                                                        TypeExtension
                                                                        Is Modifierfalse
                                                                        Summaryfalse
                                                                        Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                        ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                        SlicingThis element introduces a set of slices on Questionnaire.item.extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                                        • value @ url
                                                                        • 202. Questionnaire.item.extension:maxQuantity.url
                                                                          Definition

                                                                          Source of the definition for the extension code - a logical name or a URL.

                                                                          Shortidentifies the meaning of the extension
                                                                          Comments

                                                                          The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.

                                                                          Control1..1
                                                                          Typeuri
                                                                          Is Modifierfalse
                                                                          XML FormatIn the XML format, this property is represented as an attribute.
                                                                          Summaryfalse
                                                                          Fixed Valuehttp://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-maxQuantity
                                                                          204. Questionnaire.item.extension:maxQuantity.value[x]
                                                                          Definition

                                                                          Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).

                                                                          ShortValue of extension
                                                                          Control0..1
                                                                          TypeQuantity
                                                                          [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                                                                          Is Modifierfalse
                                                                          Must Supportfalse
                                                                          Summaryfalse
                                                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                          206. Questionnaire.item.extension:maxQuantity.value[x].id
                                                                          Definition

                                                                          Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                                          ShortUnique id for inter-element referencing
                                                                          Control0..1
                                                                          Typestring
                                                                          Is Modifierfalse
                                                                          XML FormatIn the XML format, this property is represented as an attribute.
                                                                          Summaryfalse
                                                                          208. Questionnaire.item.extension:maxQuantity.value[x].extension
                                                                          Definition

                                                                          May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                                                          ShortAdditional content defined by implementations
                                                                          Comments

                                                                          There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                                          Control0..*
                                                                          TypeExtension
                                                                          Is Modifierfalse
                                                                          Summaryfalse
                                                                          Alternate Namesextensions, user content
                                                                          Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                          ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                          SlicingThis element introduces a set of slices on Questionnaire.item.extension.value[x].extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                                          • value @ url
                                                                          • 210. Questionnaire.item.extension:maxQuantity.value[x].extension:maxQuantityCalculated
                                                                            Slice NamemaxQuantityCalculated
                                                                            Definition

                                                                            An expression that determines a calculated value. The expression may be simply the name of a expression in a referenced library, or it may be a complete inline expression.

                                                                            ShortA calculated value
                                                                            Comments

                                                                            For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                                                            Control0..1
                                                                            TypeExtension(Calculated value) (Extension Type: Expression)
                                                                            Is Modifierfalse
                                                                            Summaryfalse
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            212. Questionnaire.item.extension:maxQuantity.value[x].value
                                                                            Definition

                                                                            The value of the measured amount. The value includes an implicit precision in the presentation of the value.

                                                                            ShortNumerical value (with implicit precision)
                                                                            Comments

                                                                            The implicit precision in the value should always be honored. Monetary values have their own rules for handling precision (refer to standard accounting text books).

                                                                            Control0..1
                                                                            Typedecimal
                                                                            Is Modifierfalse
                                                                            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                            Summarytrue
                                                                            Requirements

                                                                            Precision is handled implicitly in almost all cases of measurement.

                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            214. Questionnaire.item.extension:maxQuantity.value[x].comparator
                                                                            Definition

                                                                            How the value should be understood and represented - whether the actual value is greater or less than the stated value due to measurement issues; e.g. if the comparator is "<" , then the real value is < stated value.

                                                                            Short< | <= | >= | > - how to understand the value
                                                                            Control0..1
                                                                            BindingThe codes SHALL be taken from QuantityComparator
                                                                            (required to http://hl7.org/fhir/ValueSet/quantity-comparator|4.0.1)

                                                                            How the Quantity should be understood and represented.

                                                                            Typecode
                                                                            Is Modifiertrue because This is labeled as "Is Modifier" because the comparator modifies the interpretation of the value significantly. If there is no comparator, then there is no modification of the value
                                                                            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                            Summarytrue
                                                                            Requirements

                                                                            Need a framework for handling measures where the value is <5ug/L or >400mg/L due to the limitations of measuring methodology.

                                                                            Meaning if MissingIf there is no comparator, then there is no modification of the value
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            216. Questionnaire.item.extension:maxQuantity.value[x].unit
                                                                            Definition

                                                                            A human-readable form of the unit.

                                                                            ShortUnit representation
                                                                            Control0..1
                                                                            Typestring
                                                                            Is Modifierfalse
                                                                            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                            Summarytrue
                                                                            Requirements

                                                                            There are many representations for units of measure and in many contexts, particular representations are fixed and required. I.e. mcg for micrograms.

                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            218. Questionnaire.item.extension:maxQuantity.value[x].system
                                                                            Definition

                                                                            The identification of the system that provides the coded form of the unit.

                                                                            ShortSystem that defines coded unit form
                                                                            Control0..1
                                                                            This element is affected by the following invariants: qty-3
                                                                            Typeuri
                                                                            Is Modifierfalse
                                                                            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                            Summarytrue
                                                                            Requirements

                                                                            Need to know the system that defines the coded form of the unit.

                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            220. Questionnaire.item.extension:maxQuantity.value[x].code
                                                                            Definition

                                                                            A computer processable form of the unit in some unit representation system.

                                                                            ShortCoded form of the unit
                                                                            Comments

                                                                            The preferred system is UCUM, but SNOMED CT can also be used (for customary units) or ISO 4217 for currency. The context of use may additionally require a code from a particular system.

                                                                            Control0..1
                                                                            Typecode
                                                                            Is Modifierfalse
                                                                            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                            Summarytrue
                                                                            Requirements

                                                                            Need a computable form of the unit that is fixed across all forms. UCUM provides this for quantities, but SNOMED CT provides many units of interest.

                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            222. Questionnaire.item.extension:maxDecimalPlaces
                                                                            Slice NamemaxDecimalPlaces
                                                                            Definition

                                                                            Identifies the maximum number of decimal places that may be specified for the data element.

                                                                            ShortMaximum digits after decimal
                                                                            Comments

                                                                            For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                                                            Control0..1
                                                                            TypeExtension(Max decimal places) (Extension Type: integer)
                                                                            Is Modifierfalse
                                                                            Must Supporttrue
                                                                            Summaryfalse
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            224. Questionnaire.item.extension:mimeType
                                                                            Slice NamemimeType
                                                                            Definition

                                                                            Identifies the kind(s) of attachment allowed to be sent for an element.

                                                                            ShortType of attachment
                                                                            Comments

                                                                            This extension only has meaning if the element has a type of Attachment. For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                                                            Control0..*
                                                                            TypeExtension(Mime type) (Extension Type: code)
                                                                            Is Modifierfalse
                                                                            Must Supporttrue
                                                                            Summaryfalse
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            226. Questionnaire.item.extension:maxSize
                                                                            Slice NamemaxSize
                                                                            Definition

                                                                            For attachment answers, indicates the maximum size in bytes an attachment can be.

                                                                            ShortMax size in bytes
                                                                            Comments

                                                                            This extension only has meaning if the element has a type of Attachment. For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                                                            Control0..1
                                                                            TypeExtension(Max size) (Extension Type: decimal)
                                                                            Is Modifierfalse
                                                                            Summaryfalse
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            228. Questionnaire.item.extension:answerOptionsToggleExpression
                                                                            Slice NameanswerOptionsToggleExpression
                                                                            Definition

                                                                            A complex expression that provides a list of the allowed options that should be enabled or disabled based on the evaluation of a provided expression. It allows toggling of allowed answers based on context, including the answers provided to other expressions.

                                                                            ShortExpression constraining allowed answers
                                                                            Comments

                                                                            For example, this allows a list of conditions to be modified based on the gender of the patient

                                                                            Control0..*
                                                                            TypeExtension(Answer Options Toggle Expression) (Complex Extension)
                                                                            Is Modifierfalse
                                                                            Must Supporttrue
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            230. Questionnaire.item.extension:unitOption
                                                                            Slice NameunitOption
                                                                            Definition

                                                                            A unit that the user may choose when providing a quantity value.

                                                                            ShortUnit choice
                                                                            Comments

                                                                            Provide either unitOption(s) or unitValueSet. If either of the extensions are present, the units for a Quantity element are constrained to only the units listed by the extensions - i.e. it is treated as a "required", not an "extensible" binding. In the absence of either, any unit is valid. See additional guidance and examples in the SDC implementation guide. If this extension present and an answer is provided for the question item in the QuestionnaireResponse, then the valueQuantity SHALL have a Quantity.code and Quantity.system that match the Coding.code and system of one of the allowed values if the Coding has a code and/or system. If the Coding only has a display, then the Quantity.unit must match. (Note that Coding with only a display is strongly discouraged.) If there is a match on code and system, but no match on display/unit, systems MAY raise a warning. However, because of translation and bandwidth considerations, some systems MAY opt to drop the unit or express it in an alternate language.

                                                                            Control0..*
                                                                            TypeExtension(QuestionnaireResponse Unit Option) (Extension Type: Coding)
                                                                            Is Modifierfalse
                                                                            Must Supporttrue
                                                                            Summaryfalse
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            232. Questionnaire.item.extension:unitValueSet
                                                                            Slice NameunitValueSet
                                                                            Definition

                                                                            A set of units that the user may choose when providing a quantity value.

                                                                            ShortUnit choices
                                                                            Comments

                                                                            Provide either unitOption(s) or unitValueSet. If either of the extensions are present, the units for a Quantity element are constrained to only the units listed by the extensions - i.e. it is treated as a "required", not an "extensible" binding. In the absence of either, any unit is valid. See additional guidance and examples in the SDC implementation guide. If this extension present and an answer is provided for the question item in the QuestionnaireResponse, then the valueQuantity SHALL have a Quantity.code and Quantity.system that match the Coding.code and system of one of the allowed values if the Coding has a code and/or system. If the Coding only has a display, then the Quantity.unit must match. (Note that Coding with only a display is strongly discouraged.) If there is a match on code and system, but no match on display/unit, systems MAY raise a warning. However, because of translation and bandwidth considerations, some systems MAY opt to drop the unit or express it in an alternate language. Validation of the Quantity unit MAY be performed by using the $validateCode operation, populating the elements passed into the operation from the Quantity.code, system and unit elements.

                                                                            Control0..1
                                                                            TypeExtension(QuestionnaireResponse Unit ValueSet) (Extension Type: canonical(ValueSet))
                                                                            Is Modifierfalse
                                                                            Must Supporttrue
                                                                            Summaryfalse
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            234. Questionnaire.item.extension:unitOpen
                                                                            Slice NameunitOpen
                                                                            Definition

                                                                            Indicates whether the list of supported units (conveyed in other extensions) are the exhaustive list from which the user must choose or whether they're able to select alternate codes or specify a string.

                                                                            ShortUsed to denote if user can specify alternate codes
                                                                            Control0..1
                                                                            TypeExtension(Units open?) (Extension Type: code)
                                                                            Is Modifierfalse
                                                                            Summaryfalse
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            236. Questionnaire.item.extension:unitSupplementalSystem
                                                                            Slice NameunitSupplementalSystem
                                                                            Definition

                                                                            If the questionnaire-unit-open extension indicates that additional units other than the set of options provided for the question are allowed, this indicates the code system those units are expected to be drawn from. This extension SHOULD be present on any question where questionare-unit-open allows additional coded values.

                                                                            ShortThis extension indicates the code system the additional units are drawn from
                                                                            Control0..1
                                                                            TypeExtension(Code system for other units) (Extension Type: canonical)
                                                                            Is Modifierfalse
                                                                            Summaryfalse
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            238. Questionnaire.item.extension:allowedResource
                                                                            Slice NameallowedResource
                                                                            Definition

                                                                            Where the type for a question is "Reference", indicates a type of resource that is permitted.

                                                                            ShortAllowed resource for reference
                                                                            Comments

                                                                            This extension only has meaning if the question.type = Reference. If no allowedResource extensions are present, the presumption is that any type of resource is permitted. If multiple are present, then any of the specified types are permitted. See additional guidance and examples in the SDC implementation guide.

                                                                            Control0..*
                                                                            TypeExtension(Questionnaire Reference Resource) (Extension Type: code)
                                                                            Is Modifierfalse
                                                                            Must Supporttrue
                                                                            Summaryfalse
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            240. Questionnaire.item.extension:allowedProfile
                                                                            Slice NameallowedProfile
                                                                            Definition

                                                                            Where the type for a question is "Reference", indicates a profile that the resource instances pointed to in answers to this question must be valid against.

                                                                            ShortAllowed profile for reference
                                                                            Comments

                                                                            If multiple profiles are present, then the resource must be valid against at least one of them. See additional guidance and examples in the SDC implementation guide.

                                                                            Control0..*
                                                                            TypeExtension(Questionnaire Reference Profile) (Extension Type: canonical(StructureDefinition))
                                                                            Is Modifierfalse
                                                                            Summaryfalse
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            242. Questionnaire.item.extension:candidateExpression
                                                                            Slice NamecandidateExpression
                                                                            Definition

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

                                                                            ShortExpression for possible answers
                                                                            Comments

                                                                            The results of the expression must correspond to the item type of the question the element appears on or must correspond to a resource, backbone element or complex data type for a group item. Resources are considered a match for the Reference item type. Quantity can be a match for decimal and integer items so long as a questionnaire-unit extension is present. If the expression returns coded data, it *SHALL return the information as either code or Coding, not CodeableConcept. If the expression returns elements of type 'code', when the user selects one or more candidates, the code will be matched against the allowed Codings (from answerValueSet, answerOptions, or answerExpresssion). In this case, it is an error if there is more than one Coding with the same code.

                                                                            Control0..1
                                                                            TypeExtension(Candidate Answers Expression) (Extension Type: Expression)
                                                                            Is Modifierfalse
                                                                            Summaryfalse
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            244. Questionnaire.item.extension:lookupQuestionnaire
                                                                            Slice NamelookupQuestionnaire
                                                                            Definition

                                                                            For items of type reference, the reference can be populated either by picking an existing entity or by creating a new one. In the latter case, this Questionnaire allows specifying the Questionnaire to use in creating the target instance. Typically this will result in a QuestionnaireResponse that can be extracted to produce the desired resource. However, if the target resource for the reference is a QuestionnaireResponse, then the QuestionnaireResponse resulting from the Questionnaire can be referenced directly.

                                                                            ShortQuestionnaire to populate a reference
                                                                            Control0..1
                                                                            TypeExtension(Lookup questionnaire) (Extension Type: canonical)
                                                                            Is Modifierfalse
                                                                            Summaryfalse
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            246. Questionnaire.item.extension:itemConstraint
                                                                            Slice NameitemConstraint
                                                                            Definition

                                                                            Specifies a constraint that is enforced on instantiated (or target) resources. This extension can be applied to definitional resources (such as ActivityDefinition or Measure) and indicates that the constraint should be enforced on resources that are instantiated from the definition.

                                                                            ShortA constraint on the target resource
                                                                            Comments

                                                                            Can be used on any definitional artifact to define a constraint that is enforced in the context of an instantiated resource. The constraint expression will have access to %target and %definition variables, where target is the instantiated resource, and definition is the definition used to instantiate.

                                                                            Control0..*
                                                                            TypeExtension(Target Constraint) (Complex Extension)
                                                                            Is Modifierfalse
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            248. Questionnaire.item.extension:initialExpression
                                                                            Slice NameinitialExpression
                                                                            Definition

                                                                            Initial value for a question answer as determined by an evaluated expression.

                                                                            ShortExpression-determined initial value
                                                                            Comments

                                                                            Initial value is only calculated at the time the QuestionnaireResponse is first generated. If the expression returns coded data, it *SHALL return the information as either code or Coding, not CodeableConcept. If the expression returns elements of type 'code', when the user selects one or more candidates, the code will be matched against the allowed Codings (from answerValueSet, answerOptions, or answerExpression). In this case, it is an error if there is more than one Coding with the same code.

                                                                            Control0..1
                                                                            TypeExtension(Initial Expression) (Extension Type: Expression)
                                                                            Is Modifierfalse
                                                                            Summaryfalse
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            250. Questionnaire.item.extension:calculatedExpression
                                                                            Slice NamecalculatedExpression
                                                                            Definition

                                                                            Calculated value for a question answer as determined by an evaluated expression.

                                                                            ShortExpression-determined initial value
                                                                            Comments

                                                                            Calculated value is updated as other answers in the QuestionnaireResponse are filled in.

                                                                            Control0..1
                                                                            TypeExtension(Calculated Expression) (Extension Type: Expression)
                                                                            Is Modifierfalse
                                                                            Summaryfalse
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            252. Questionnaire.item.extension:enableWhenExpression
                                                                            Slice NameenableWhenExpression
                                                                            Definition

                                                                            An expression that returns a boolean value for whether to enable the item.

                                                                            ShortExpression for when to enable the item
                                                                            Comments

                                                                            This is only permitted when the containing item does NOT have any enableWhen elements.

                                                                            If the expression involves comparisons between elements that have different precisions but are otherwise equal, FHIRPath will resolve the expression to an empty set, which will in turn evaluate to false (meaning the item won't be enabled). If this is not the desired behavior, the author should add a .allTrue() to the end of the expression, which will result in an indeterminate outcome because of precision differences being handled as 'true' and the item being enabled. Questionnaires SHOULD be designed to take into account challenges around varying precision to minimize non-deterministic situations by setting constraints around expected precision, etc.

                                                                            If the expression evaluates to something other than a boolean true or false, the Form Filler SHOULD still display the form, and if it does so, SHOULD treat the element as 'enabled' and display a warning to the user that the questionnaire logic was faulty and it's possible that the item shouldn't be enabled.

                                                                            Control0..1
                                                                            TypeExtension(Enable when expression) (Extension Type: Expression)
                                                                            Is Modifierfalse
                                                                            Must Supporttrue
                                                                            Summaryfalse
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            254. Questionnaire.item.extension:keyboardType
                                                                            Slice NamekeyboardType
                                                                            Definition

                                                                            For string or text items, indicates the 'keyboard type' that should be used by the user interface to guide entry.

                                                                            ShortKeyboard Type
                                                                            Comments

                                                                            The assertion applies on a per item basis and is not inherited. If the item is 'text', only 'chat' should be declared if this extension is present.

                                                                            Control0..1
                                                                            TypeExtension(Keyboard Type Extension) (Extension Type: Coding)
                                                                            Is Modifierfalse
                                                                            Summaryfalse
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            256. Questionnaire.item.modifierExtension
                                                                            Definition

                                                                            May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                                                                            Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

                                                                            ShortExtensions that cannot be ignored even if unrecognized
                                                                            Comments

                                                                            There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                                            Control0..*
                                                                            TypeExtension
                                                                            Is Modifiertrue because Modifier extensions are expected to modify the meaning or interpretation of the element that contains them
                                                                            Summarytrue
                                                                            Requirements

                                                                            Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

                                                                            Alternate Namesextensions, user content, modifiers
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            258. Questionnaire.item.linkId
                                                                            Definition

                                                                            An identifier that is unique within the Questionnaire allowing linkage to the equivalent item in a QuestionnaireResponse resource.

                                                                            ShortUnique id for item in questionnaire
                                                                            Comments

                                                                            This ''can'' be a meaningful identifier (e.g. a LOINC code) but is not intended to have any meaning. GUIDs or sequential numbers are appropriate here.

                                                                            Control1..1
                                                                            Typestring
                                                                            Is Modifierfalse
                                                                            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                            Must Supporttrue
                                                                            Summaryfalse
                                                                            Requirements

                                                                            QuestionnaireResponse does not require omitted items to be included and may have some items that repeat, so linkage based on position alone is not sufficient.

                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            que-15: Link ids must be 255 characters or less ($this.length() <= 255)
                                                                            260. Questionnaire.item.definition
                                                                            Definition

                                                                            This element is a URI that refers to an ElementDefinition that provides information about this item, including information that might otherwise be included in the instance of the Questionnaire resource. A detailed description of the construction of the URI is shown in Comments, below. If this element is present then the following element values MAY be derived from the Element Definition if the corresponding elements of this Questionnaire resource instance have no value:

                                                                            • code (ElementDefinition.code)
                                                                            • type (ElementDefinition.type)
                                                                            • required (ElementDefinition.min)
                                                                            • repeats (ElementDefinition.max)
                                                                            • maxLength (ElementDefinition.maxLength)
                                                                            • answerValueSet (ElementDefinition.binding)
                                                                            • options (ElementDefinition.binding).
                                                                            ShortElementDefinition - details for the item
                                                                            Comments

                                                                            The uri refers to an ElementDefinition in a StructureDefinition and always starts with the canonical URL for the target resource. When referring to a StructureDefinition, a fragment identifier is used to specify the element definition by its id Element.id. E.g. http://hl7.org/fhir/StructureDefinition/Observation#Observation.value[x]. In the absence of a fragment identifier, the first/root element definition in the target is the matching element definition.

                                                                            Control0..1
                                                                            Typeuri
                                                                            Is Modifierfalse
                                                                            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                            Summaryfalse
                                                                            Requirements

                                                                            A common pattern is to define a set of data elements and then build multiple questionnaires for different circumstances to gather the data. This element provides traceability to the common definition and allows the content for the question to come from the underlying definition.

                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            262. Questionnaire.item.code
                                                                            Definition

                                                                            A terminology code that corresponds to this group or question (e.g. a code from LOINC, which defines many questions and answers).

                                                                            ShortCorresponding concept for this item in a terminology
                                                                            Comments

                                                                            The value may come from the ElementDefinition referred to by .definition.

                                                                            Control0..*
                                                                            This element is affected by the following invariants: que-3
                                                                            BindingFor example codes, see QuestionnaireQuestionCodes
                                                                            (example to http://hl7.org/fhir/ValueSet/questionnaire-questions)

                                                                            Codes for questionnaires, groups and individual questions.

                                                                            TypeCoding
                                                                            Is Modifierfalse
                                                                            Summaryfalse
                                                                            Requirements

                                                                            Allows linking of groups of questions to formal terminologies.

                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            264. Questionnaire.item.prefix
                                                                            Definition

                                                                            A short label for a particular group, question or set of display text within the questionnaire used for reference by the individual completing the questionnaire.

                                                                            ShortE.g. "1(a)", "2.5.3"
                                                                            Comments

                                                                            These are generally unique within a questionnaire, though this is not guaranteed. Some questionnaires may have multiple questions with the same label with logic to control which gets exposed. Typically, these won't be used for "display" items, though such use is not prohibited. Systems SHOULD NOT generate their own prefixes if prefixes are defined for any items within a Questionnaire.

                                                                            Control0..1
                                                                            Typestring
                                                                            Is Modifierfalse
                                                                            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                            Must Supporttrue
                                                                            Summaryfalse
                                                                            Requirements

                                                                            Separating the label from the question text allows improved rendering. Also, instructions will often refer to specific prefixes, so there's a need for the questionnaire design to have control over what labels are used.

                                                                            Alternate Nameslabel
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            266. Questionnaire.item.text
                                                                            Definition

                                                                            The name of a section, the text of a question or text content for a display item.

                                                                            ShortPrimary text for the item
                                                                            Comments

                                                                            When using this element to represent the name of a section, use group type item and also make sure to limit the text element to a short string suitable for display as a section heading. Group item instructions should be included as a display type item within the group.

                                                                            Control0..1
                                                                            Typestring
                                                                            Is Modifierfalse
                                                                            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                            Summaryfalse
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            268. Questionnaire.item.type
                                                                            Definition

                                                                            The type of questionnaire item this is - whether text for display, a grouping of other items or a particular type of data to be captured (string, integer, coded choice, etc.).

                                                                            Shortgroup | display | boolean | decimal | integer | date | dateTime +
                                                                            Comments

                                                                            Time is handled using "string". File is handled using Attachment. (Content can be sent as a contained binary).

                                                                            Control1..1
                                                                            BindingThe codes SHALL be taken from QuestionnaireItemType
                                                                            (required to http://hl7.org/fhir/ValueSet/item-type|4.0.1)

                                                                            Distinguishes groups from questions and display text and indicates data type for questions.

                                                                            Typecode
                                                                            Is Modifierfalse
                                                                            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                            Must Supporttrue
                                                                            Summaryfalse
                                                                            Requirements

                                                                            Defines the format in which the user is to be prompted for the answer.

                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            270. Questionnaire.item.enableWhen
                                                                            Definition

                                                                            A constraint indicating that this item should only be enabled (displayed/allow answers to be captured) when the specified condition is true.

                                                                            ShortOnly allow data when
                                                                            Comments

                                                                            If multiple repetitions of this extension are present, the item should be enabled when the condition for any of the repetitions is true. I.e. treat "enableWhen"s as being joined by an "or" clause. This element is a modifier because if enableWhen is present for an item, "required" is ignored unless one of the enableWhen conditions is met. When an item is disabled, all of its descendants are disabled, regardless of what their own enableWhen logic might evaluate to.

                                                                            Control0..*
                                                                            TypeBackboneElement
                                                                            Is Modifiertrue because If enableWhen is present and the condition evaluates to false, then the Questionnaire behaves as though the elements weren't actually present
                                                                            Summaryfalse
                                                                            Requirements

                                                                            Allows questionnaires to adapt based on answers to other questions. E.g. If physical gender is specified as a male, no need to capture pregnancy history. Also allows conditional display of instructions or groups of questions.

                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            que-7: If the operator is 'exists', the value must be a boolean (operator = 'exists' implies (answer is Boolean))
                                                                            272. Questionnaire.item.enableWhen.id
                                                                            Definition

                                                                            Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                                            ShortUnique id for inter-element referencing
                                                                            Control0..1
                                                                            Typestring
                                                                            Is Modifierfalse
                                                                            XML FormatIn the XML format, this property is represented as an attribute.
                                                                            Summaryfalse
                                                                            274. Questionnaire.item.enableWhen.extension
                                                                            Definition

                                                                            May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                                                            ShortAdditional content defined by implementations
                                                                            Comments

                                                                            There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                                            Control0..*
                                                                            TypeExtension
                                                                            Is Modifierfalse
                                                                            Summaryfalse
                                                                            Alternate Namesextensions, user content
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            276. Questionnaire.item.enableWhen.modifierExtension
                                                                            Definition

                                                                            May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                                                                            Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

                                                                            ShortExtensions that cannot be ignored even if unrecognized
                                                                            Comments

                                                                            There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                                            Control0..*
                                                                            TypeExtension
                                                                            Is Modifiertrue because Modifier extensions are expected to modify the meaning or interpretation of the element that contains them
                                                                            Summarytrue
                                                                            Requirements

                                                                            Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

                                                                            Alternate Namesextensions, user content, modifiers
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            278. Questionnaire.item.enableWhen.question
                                                                            Definition

                                                                            The linkId for the question whose answer (or lack of answer) governs whether this item is enabled.

                                                                            ShortQuestion that determines whether item is enabled
                                                                            Comments

                                                                            If multiple question occurrences are present for the same question (same linkId), then this refers to the nearest question occurrence reachable by tracing first the "ancestor" axis and then the "preceding" axis and then the "following" axis.

                                                                            Control1..1
                                                                            Typestring
                                                                            Is Modifierfalse
                                                                            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                            Must Supporttrue
                                                                            Summaryfalse
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            280. Questionnaire.item.enableWhen.operator
                                                                            Definition

                                                                            Specifies the criteria by which the question is enabled.

                                                                            Shortexists | = | != | > | < | >= | <=
                                                                            Control1..1
                                                                            BindingThe codes SHALL be taken from QuestionnaireItemOperator
                                                                            (required to http://hl7.org/fhir/ValueSet/questionnaire-enable-operator|4.0.1)

                                                                            The criteria by which a question is enabled.

                                                                            Typecode
                                                                            Is Modifierfalse
                                                                            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                            Must Supporttrue
                                                                            Summaryfalse
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            282. Questionnaire.item.enableWhen.answer[x]
                                                                            Definition

                                                                            A value that the referenced question is tested using the specified operator in order for the item to be enabled.

                                                                            ShortValue for question comparison based on operator
                                                                            Control1..1
                                                                            This element is affected by the following invariants: que-7
                                                                            BindingFor example codes, see QuestionnaireAnswerCodes
                                                                            (example to http://hl7.org/fhir/ValueSet/questionnaire-answers)

                                                                            Allowed values to answer questions.

                                                                            TypeChoice of: boolean, decimal, integer, date, dateTime, time, string, Coding, Quantity, Reference(Resource)
                                                                            [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                                                                            Is Modifierfalse
                                                                            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                            Must Supporttrue
                                                                            Must Support TypesNo must-support rules about the choice of types/profiles
                                                                            Summaryfalse
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            284. Questionnaire.item.enableBehavior
                                                                            Definition

                                                                            Controls how multiple enableWhen values are interpreted - whether all or any must be true.

                                                                            Shortall | any
                                                                            Comments

                                                                            This element must be specified if more than one enableWhen value is provided.

                                                                            Control0..1
                                                                            This element is affected by the following invariants: que-12
                                                                            BindingThe codes SHALL be taken from EnableWhenBehavior
                                                                            (required to http://hl7.org/fhir/ValueSet/questionnaire-enable-behavior|4.0.1)

                                                                            Controls how multiple enableWhen values are interpreted - whether all or any must be true.

                                                                            Typecode
                                                                            Is Modifierfalse
                                                                            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                            Must Supporttrue
                                                                            Summaryfalse
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            286. Questionnaire.item.required
                                                                            Definition

                                                                            An indication, if true, that the item must be present in a "completed" QuestionnaireResponse. If false, the item may be skipped when answering the questionnaire.

                                                                            ShortWhether the item must be included in data results
                                                                            Comments

                                                                            Questionnaire.item.required only has meaning for elements that are conditionally enabled with enableWhen if the condition evaluates to true. If an item that contains other items is marked as required, that does not automatically make the contained elements required (though required groups must contain at least one child element). The value may come from the ElementDefinition referred to by .definition.

                                                                            Control0..1
                                                                            This element is affected by the following invariants: que-6
                                                                            Typeboolean
                                                                            Is Modifierfalse
                                                                            Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                            Must Supporttrue
                                                                            Summaryfalse
                                                                            Meaning if MissingItems are generally assumed not to be required unless explicitly specified. Systems SHOULD always populate this value
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            288. Questionnaire.item.required.id
                                                                            Definition

                                                                            unique id for the element within a resource (for internal references)

                                                                            Shortxml:id (or equivalent in JSON)
                                                                            Control0..1
                                                                            Typestring
                                                                            Is Modifierfalse
                                                                            XML FormatIn the XML format, this property is represented as an attribute.
                                                                            Summaryfalse
                                                                            290. Questionnaire.item.required.extension
                                                                            Definition

                                                                            May be used to represent additional information that is not part of the basic definition of the resource. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                                                            ShortAdditional content defined by implementations
                                                                            Comments

                                                                            There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                                            Control0..*
                                                                            TypeExtension
                                                                            Is Modifierfalse
                                                                            Summaryfalse
                                                                            Alternate Namesextensions, user content
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            292. Questionnaire.item.required.value
                                                                            Definition

                                                                            The actual value

                                                                            ShortPrimitive value for boolean
                                                                            Control0..1
                                                                            Typeboolean
                                                                            Is Modifierfalse
                                                                            XML FormatIn the XML format, this property is represented as an attribute.
                                                                            Summaryfalse
                                                                            294. Questionnaire.item.required.value.id
                                                                            Definition

                                                                            unique id for the element within a resource (for internal references)

                                                                            Shortxml:id (or equivalent in JSON)
                                                                            Control0..1
                                                                            Typestring
                                                                            Is Modifierfalse
                                                                            XML FormatIn the XML format, this property is represented as an attribute.
                                                                            Summaryfalse
                                                                            296. Questionnaire.item.required.value.extension
                                                                            Definition

                                                                            An Extension

                                                                            ShortExtension
                                                                            Control0..*
                                                                            TypeExtension
                                                                            Is Modifierfalse
                                                                            Summaryfalse
                                                                            Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                            ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                            SlicingThis element introduces a set of slices on Questionnaire.item.required.value.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                                            • value @ url
                                                                            • 298. Questionnaire.item.required.value.extension:requiredExpression
                                                                              Slice NamerequiredExpression
                                                                              Definition

                                                                              An expression that, when evaluated, provides the value for the element on which it appears.

                                                                              ShortAn dynamic expression
                                                                              Comments

                                                                              For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                                                              Control0..1
                                                                              TypeExtension(CQF Expression) (Extension Type: Expression)
                                                                              Is Modifierfalse
                                                                              Must Supporttrue
                                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                              ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                              300. Questionnaire.item.required.value.value
                                                                              Definition

                                                                              The actual value

                                                                              ShortPrimitive value for boolean
                                                                              Control0..1
                                                                              Typeboolean
                                                                              Is Modifierfalse
                                                                              XML FormatIn the XML format, this property is represented as an attribute.
                                                                              Summaryfalse
                                                                              302. Questionnaire.item.repeats
                                                                              Definition

                                                                              An indication, if true, that a QuestionnaireResponse for this item may include multiple answers associated with a single instance of this item (for question-type items) or multiple repetitions of the item (for group-type items)

                                                                              ShortWhether the item may repeat
                                                                              Comments

                                                                              If a question is marked as repeats=true, then multiple answers can be provided for the question in the corresponding QuestionnaireResponse. When rendering the questionnaire, it is up to the rendering software whether to render the question text for each answer repetition (i.e. "repeat the question") or to simply allow entry/selection of multiple answers for the question (repeat the answers). Which is most appropriate visually may depend on the type of answer as well as whether there are nested items.

                                                                              The resulting QuestionnaireResponse will be populated the same way regardless of rendering - one 'question' item with multiple answer values.

                                                                              The value may come from the ElementDefinition referred to by .definition.

                                                                              Control0..1
                                                                              This element is affected by the following invariants: que-6
                                                                              Typeboolean
                                                                              Is Modifierfalse
                                                                              Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                              Must Supporttrue
                                                                              Summaryfalse
                                                                              Requirements

                                                                              Items may be used to create set of (related) questions that can be repeated to give multiple answers to such a set.

                                                                              Meaning if MissingItems are generally assumed not to repeat unless explicitly specified. Systems SHOULD always populate this value
                                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                              304. Questionnaire.item.repeats.id
                                                                              Definition

                                                                              unique id for the element within a resource (for internal references)

                                                                              Shortxml:id (or equivalent in JSON)
                                                                              Control0..1
                                                                              Typestring
                                                                              Is Modifierfalse
                                                                              XML FormatIn the XML format, this property is represented as an attribute.
                                                                              Summaryfalse
                                                                              306. Questionnaire.item.repeats.extension
                                                                              Definition

                                                                              May be used to represent additional information that is not part of the basic definition of the resource. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                                                              ShortAdditional content defined by implementations
                                                                              Comments

                                                                              There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                                              Control0..*
                                                                              TypeExtension
                                                                              Is Modifierfalse
                                                                              Summaryfalse
                                                                              Alternate Namesextensions, user content
                                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                              ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                              308. Questionnaire.item.repeats.value
                                                                              Definition

                                                                              The actual value

                                                                              ShortPrimitive value for boolean
                                                                              Control0..1
                                                                              Typeboolean
                                                                              Is Modifierfalse
                                                                              XML FormatIn the XML format, this property is represented as an attribute.
                                                                              Summaryfalse
                                                                              310. Questionnaire.item.repeats.value.id
                                                                              Definition

                                                                              unique id for the element within a resource (for internal references)

                                                                              Shortxml:id (or equivalent in JSON)
                                                                              Control0..1
                                                                              Typestring
                                                                              Is Modifierfalse
                                                                              XML FormatIn the XML format, this property is represented as an attribute.
                                                                              Summaryfalse
                                                                              312. Questionnaire.item.repeats.value.extension
                                                                              Definition

                                                                              An Extension

                                                                              ShortExtension
                                                                              Control0..*
                                                                              TypeExtension
                                                                              Is Modifierfalse
                                                                              Summaryfalse
                                                                              Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                              ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                              SlicingThis element introduces a set of slices on Questionnaire.item.repeats.value.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                                              • value @ url
                                                                              • 314. Questionnaire.item.repeats.value.extension:repeatsExpression
                                                                                Slice NamerepeatsExpression
                                                                                Definition

                                                                                An expression that, when evaluated, provides the value for the element on which it appears.

                                                                                ShortAn dynamic expression
                                                                                Comments

                                                                                For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                                                                Control0..1
                                                                                TypeExtension(CQF Expression) (Extension Type: Expression)
                                                                                Is Modifierfalse
                                                                                Must Supporttrue
                                                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                                ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                                316. Questionnaire.item.repeats.value.value
                                                                                Definition

                                                                                The actual value

                                                                                ShortPrimitive value for boolean
                                                                                Control0..1
                                                                                Typeboolean
                                                                                Is Modifierfalse
                                                                                XML FormatIn the XML format, this property is represented as an attribute.
                                                                                Summaryfalse
                                                                                318. Questionnaire.item.readOnly
                                                                                Definition

                                                                                An indication, when true, that the value cannot be changed by a human respondent to the Questionnaire.

                                                                                ShortDon't allow human editing
                                                                                Comments

                                                                                The value of readOnly elements can be established by asserting extensions for defaultValues, linkages that support pre-population and/or extensions that support calculation based on other answers.

                                                                                Control0..1
                                                                                This element is affected by the following invariants: que-9
                                                                                Typeboolean
                                                                                Is Modifierfalse
                                                                                Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                                Must Supporttrue
                                                                                Summaryfalse
                                                                                Requirements

                                                                                Allows certain information to be phrased (and rendered) as a question and an answer, while keeping users from changing it. May also be useful for preventing changes to pre-populated portions of a questionnaire, for calculated values, etc.

                                                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                                320. Questionnaire.item.readOnly.id
                                                                                Definition

                                                                                unique id for the element within a resource (for internal references)

                                                                                Shortxml:id (or equivalent in JSON)
                                                                                Control0..1
                                                                                Typestring
                                                                                Is Modifierfalse
                                                                                XML FormatIn the XML format, this property is represented as an attribute.
                                                                                Summaryfalse
                                                                                322. Questionnaire.item.readOnly.extension
                                                                                Definition

                                                                                May be used to represent additional information that is not part of the basic definition of the resource. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                                                                ShortAdditional content defined by implementations
                                                                                Comments

                                                                                There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                                                Control0..*
                                                                                TypeExtension
                                                                                Is Modifierfalse
                                                                                Summaryfalse
                                                                                Alternate Namesextensions, user content
                                                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                                ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                                324. Questionnaire.item.readOnly.value
                                                                                Definition

                                                                                The actual value

                                                                                ShortPrimitive value for boolean
                                                                                Control0..1
                                                                                Typeboolean
                                                                                Is Modifierfalse
                                                                                XML FormatIn the XML format, this property is represented as an attribute.
                                                                                Summaryfalse
                                                                                326. Questionnaire.item.readOnly.value.id
                                                                                Definition

                                                                                unique id for the element within a resource (for internal references)

                                                                                Shortxml:id (or equivalent in JSON)
                                                                                Control0..1
                                                                                Typestring
                                                                                Is Modifierfalse
                                                                                XML FormatIn the XML format, this property is represented as an attribute.
                                                                                Summaryfalse
                                                                                328. Questionnaire.item.readOnly.value.extension
                                                                                Definition

                                                                                An Extension

                                                                                ShortExtension
                                                                                Control0..*
                                                                                TypeExtension
                                                                                Is Modifierfalse
                                                                                Summaryfalse
                                                                                Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                                ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                                SlicingThis element introduces a set of slices on Questionnaire.item.readOnly.value.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                                                • value @ url
                                                                                • 330. Questionnaire.item.readOnly.value.extension:readOnlyExpression
                                                                                  Slice NamereadOnlyExpression
                                                                                  Definition

                                                                                  An expression that, when evaluated, provides the value for the element on which it appears.

                                                                                  ShortAn dynamic expression
                                                                                  Comments

                                                                                  For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                                                                  Control0..1
                                                                                  TypeExtension(CQF Expression) (Extension Type: Expression)
                                                                                  Is Modifierfalse
                                                                                  Must Supporttrue
                                                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                                  332. Questionnaire.item.readOnly.value.value
                                                                                  Definition

                                                                                  The actual value

                                                                                  ShortPrimitive value for boolean
                                                                                  Control0..1
                                                                                  Typeboolean
                                                                                  Is Modifierfalse
                                                                                  XML FormatIn the XML format, this property is represented as an attribute.
                                                                                  Summaryfalse
                                                                                  334. Questionnaire.item.maxLength
                                                                                  Definition

                                                                                  The maximum number of characters that are permitted in the answer to be considered a "valid" QuestionnaireResponse.

                                                                                  ShortNo more than this many characters
                                                                                  Comments

                                                                                  For base64binary, reflects the number of characters representing the encoded data, not the number of bytes of the binary data. The value may come from the ElementDefinition referred to by .definition.

                                                                                  Control0..1
                                                                                  This element is affected by the following invariants: que-10
                                                                                  Typeinteger
                                                                                  Is Modifierfalse
                                                                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                                  Summaryfalse
                                                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                                  336. Questionnaire.item.answerValueSet
                                                                                  Definition

                                                                                  A reference to a value set containing a list of codes representing permitted answers for a "choice" or "open-choice" question.

                                                                                  ShortValueset containing permitted answers
                                                                                  Comments

                                                                                  LOINC defines many useful value sets for questionnaire responses. See LOINC Answer Lists. The value may come from the ElementDefinition referred to by .definition.

                                                                                  Control0..1
                                                                                  This element is affected by the following invariants: que-4, que-5
                                                                                  Typecanonical(SDC Value Set)
                                                                                  Is Modifierfalse
                                                                                  Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                                  Summaryfalse
                                                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                                  338. Questionnaire.item.answerValueSet.id
                                                                                  Definition

                                                                                  unique id for the element within a resource (for internal references)

                                                                                  Shortxml:id (or equivalent in JSON)
                                                                                  Control0..1
                                                                                  Typestring
                                                                                  Is Modifierfalse
                                                                                  XML FormatIn the XML format, this property is represented as an attribute.
                                                                                  Summaryfalse
                                                                                  340. Questionnaire.item.answerValueSet.extension
                                                                                  Definition

                                                                                  May be used to represent additional information that is not part of the basic definition of the resource. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                                                                  ShortAdditional content defined by implementations
                                                                                  Comments

                                                                                  There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                                                  Control0..*
                                                                                  TypeExtension
                                                                                  Is Modifierfalse
                                                                                  Summaryfalse
                                                                                  Alternate Namesextensions, user content
                                                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                                  342. Questionnaire.item.answerValueSet.value
                                                                                  Definition

                                                                                  Primitive value for canonical

                                                                                  ShortPrimitive value for canonical
                                                                                  Control0..1
                                                                                  Typestring
                                                                                  Is Modifierfalse
                                                                                  XML FormatIn the XML format, this property is represented as an attribute.
                                                                                  Summaryfalse
                                                                                  344. Questionnaire.item.answerValueSet.value.id
                                                                                  Definition

                                                                                  unique id for the element within a resource (for internal references)

                                                                                  Shortxml:id (or equivalent in JSON)
                                                                                  Control0..1
                                                                                  Typestring
                                                                                  Is Modifierfalse
                                                                                  XML FormatIn the XML format, this property is represented as an attribute.
                                                                                  Summaryfalse
                                                                                  346. Questionnaire.item.answerValueSet.value.extension
                                                                                  Definition

                                                                                  An Extension

                                                                                  ShortExtension
                                                                                  Control0..*
                                                                                  TypeExtension
                                                                                  Is Modifierfalse
                                                                                  Summaryfalse
                                                                                  Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                                  ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                                  SlicingThis element introduces a set of slices on Questionnaire.item.answerValueSet.value.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                                                  • value @ url
                                                                                  • 348. Questionnaire.item.answerValueSet.value.extension:answerValueSetExpression
                                                                                    Slice NameanswerValueSetExpression
                                                                                    Definition

                                                                                    An expression that, when evaluated, provides the value for the element on which it appears.

                                                                                    ShortAn dynamic expression
                                                                                    Comments

                                                                                    For questionnaires, see additional guidance and examples in the SDC implementation guide.

                                                                                    Control0..1
                                                                                    TypeExtension(CQF Expression) (Extension Type: Expression)
                                                                                    Is Modifierfalse
                                                                                    Must Supporttrue
                                                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                                    350. Questionnaire.item.answerValueSet.value.value
                                                                                    Definition

                                                                                    The actual value

                                                                                    ShortPrimitive value for string
                                                                                    Control0..1
                                                                                    Typestring
                                                                                    Is Modifierfalse
                                                                                    XML FormatIn the XML format, this property is represented as an attribute.
                                                                                    Summaryfalse
                                                                                    Max Length:1048576
                                                                                    352. Questionnaire.item.answerOption
                                                                                    Definition

                                                                                    One of the permitted answers for a "choice" or "open-choice" question.

                                                                                    ShortPermitted answer
                                                                                    Comments

                                                                                    This element can be used when the value set machinery of answerValueSet is deemed too cumbersome or when there's a need to capture possible answers that are not codes.

                                                                                    Control0..*
                                                                                    This element is affected by the following invariants: que-4, que-5
                                                                                    TypeBackboneElement
                                                                                    Is Modifierfalse
                                                                                    Must Supporttrue
                                                                                    Summaryfalse
                                                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                                    354. Questionnaire.item.answerOption.id
                                                                                    Definition

                                                                                    Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                                                    ShortUnique id for inter-element referencing
                                                                                    Control0..1
                                                                                    Typestring
                                                                                    Is Modifierfalse
                                                                                    XML FormatIn the XML format, this property is represented as an attribute.
                                                                                    Summaryfalse
                                                                                    356. Questionnaire.item.answerOption.extension
                                                                                    Definition

                                                                                    An Extension

                                                                                    ShortExtension
                                                                                    Control0..*
                                                                                    TypeExtension
                                                                                    Is Modifierfalse
                                                                                    Summaryfalse
                                                                                    Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                                    ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                                    SlicingThis element introduces a set of slices on Questionnaire.item.answerOption.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators:
                                                                                    • value @ url
                                                                                    • 358. Questionnaire.item.answerOption.extension:optionExclusive
                                                                                      Slice NameoptionExclusive
                                                                                      Definition

                                                                                      If true, indicates that if this answerOption is selected, no other possible answers may be selected, even if the item is a repeating question.

                                                                                      ShortOption is exclusive
                                                                                      Comments

                                                                                      See additional guidance and examples in the SDC implementation guide.

                                                                                      Control0..1
                                                                                      TypeExtension(Questionnaire Option Exclusive) (Extension Type: boolean)
                                                                                      Is Modifierfalse
                                                                                      Must Supporttrue
                                                                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                                      ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                                      360. Questionnaire.item.answerOption.extension:itemWeight
                                                                                      Slice NameitemWeight
                                                                                      Definition

                                                                                      A numeric value that allows the comparison (less than, greater than) or other numerical manipulation of a concept (e.g. Adding up components of a score). Scores are usually a whole number, but occasionally decimals are encountered in scores. In the CodeSystem and ValueSet resources, the item weight is represented using the itemWeight property

                                                                                      ShortAssigned Ordinal Value
                                                                                      Comments

                                                                                      NOTE: questionnaire.item.answerOption can have a type of Coding, potentially allowing two different scopes for this extension. In the case where answerOption is available, the weight SHALL be declared on the answerOption rather than on the answerOption.valueCoding.

                                                                                      Control0..1
                                                                                      TypeExtension(Item Weight) (Extension Type: decimal)
                                                                                      Is Modifierfalse
                                                                                      Must Supporttrue
                                                                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                                      ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                                      362. Questionnaire.item.answerOption.modifierExtension
                                                                                      Definition

                                                                                      May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                                                                                      Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

                                                                                      ShortExtensions that cannot be ignored even if unrecognized
                                                                                      Comments

                                                                                      There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                                                      Control0..*
                                                                                      TypeExtension
                                                                                      Is Modifiertrue because Modifier extensions are expected to modify the meaning or interpretation of the element that contains them
                                                                                      Summarytrue
                                                                                      Requirements

                                                                                      Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

                                                                                      Alternate Namesextensions, user content, modifiers
                                                                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                                      ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                                      364. Questionnaire.item.answerOption.value[x]
                                                                                      Definition

                                                                                      A potential answer that's allowed as the answer to this question.

                                                                                      ShortAnswer value
                                                                                      Comments

                                                                                      The data type of the value must agree with the item.type.

                                                                                      Control1..1
                                                                                      BindingFor example codes, see QuestionnaireAnswerCodes
                                                                                      (example to http://hl7.org/fhir/ValueSet/questionnaire-answers)

                                                                                      Allowed values to answer questions.

                                                                                      TypeChoice of: integer, date, time, string, Coding, Reference(Resource)
                                                                                      [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                                                                                      Is Modifierfalse
                                                                                      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                                      Must Supporttrue
                                                                                      Must Support TypesNo must-support rules about the choice of types/profiles
                                                                                      Summaryfalse
                                                                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                                      366. Questionnaire.item.answerOption.initialSelected
                                                                                      Definition

                                                                                      Indicates whether the answer value is selected when the list of possible answers is initially shown.

                                                                                      ShortWhether option is selected by default
                                                                                      Comments

                                                                                      Use this instead of initial[v] if answerValueSet is present.

                                                                                      Control0..1
                                                                                      Typeboolean
                                                                                      Is Modifierfalse
                                                                                      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                                      Summaryfalse
                                                                                      Meaning if MissingOnly selected items explicitly marked to be selected
                                                                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                                      368. Questionnaire.item.initial
                                                                                      Definition

                                                                                      One or more values that should be pre-populated in the answer when initially rendering the questionnaire for user input.

                                                                                      ShortInitial value(s) when item is first rendered
                                                                                      Comments

                                                                                      The user is allowed to change the value and override the default (unless marked as read-only). If the user doesn't change the value, then this initial value will be persisted when the QuestionnaireResponse is initially created. Note that initial values can influence results. The data type of initial[x] must agree with the item.type, and only repeating items can have more then one initial value.

                                                                                      Control0..*
                                                                                      This element is affected by the following invariants: que-8, que-13
                                                                                      TypeBackboneElement
                                                                                      Is Modifierfalse
                                                                                      Must Supporttrue
                                                                                      Summaryfalse
                                                                                      Requirements

                                                                                      In some workflows, having defaults saves time.

                                                                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                                      370. Questionnaire.item.initial.id
                                                                                      Definition

                                                                                      Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

                                                                                      ShortUnique id for inter-element referencing
                                                                                      Control0..1
                                                                                      Typestring
                                                                                      Is Modifierfalse
                                                                                      XML FormatIn the XML format, this property is represented as an attribute.
                                                                                      Summaryfalse
                                                                                      372. Questionnaire.item.initial.extension
                                                                                      Definition

                                                                                      May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

                                                                                      ShortAdditional content defined by implementations
                                                                                      Comments

                                                                                      There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                                                      Control0..*
                                                                                      TypeExtension
                                                                                      Is Modifierfalse
                                                                                      Summaryfalse
                                                                                      Alternate Namesextensions, user content
                                                                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                                      ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                                      374. Questionnaire.item.initial.modifierExtension
                                                                                      Definition

                                                                                      May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.

                                                                                      Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).

                                                                                      ShortExtensions that cannot be ignored even if unrecognized
                                                                                      Comments

                                                                                      There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

                                                                                      Control0..*
                                                                                      TypeExtension
                                                                                      Is Modifiertrue because Modifier extensions are expected to modify the meaning or interpretation of the element that contains them
                                                                                      Summarytrue
                                                                                      Requirements

                                                                                      Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.

                                                                                      Alternate Namesextensions, user content, modifiers
                                                                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                                      ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
                                                                                      376. Questionnaire.item.initial.value[x]
                                                                                      Definition

                                                                                      The actual value to for an initial answer.

                                                                                      ShortActual value for initializing the question
                                                                                      Comments

                                                                                      The type of the initial value must be consistent with the type of the item.

                                                                                      Control1..1
                                                                                      BindingFor example codes, see QuestionnaireAnswerCodes
                                                                                      (example to http://hl7.org/fhir/ValueSet/questionnaire-answers)

                                                                                      Allowed values to answer questions.

                                                                                      TypeChoice of: boolean, decimal, integer, date, dateTime, time, string, uri, Attachment, Coding, Quantity, Reference(Resource)
                                                                                      [x] NoteSeeChoice of Data Typesfor further information about how to use [x]
                                                                                      Is Modifierfalse
                                                                                      Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
                                                                                      Must Supporttrue
                                                                                      Must Support TypesNo must-support rules about the choice of types/profiles
                                                                                      Summaryfalse
                                                                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
                                                                                      378. Questionnaire.item.item
                                                                                      Definition

                                                                                      Text, questions and other groups to be nested beneath a question or group.

                                                                                      ShortNested questionnaire items
                                                                                      Comments

                                                                                      There is no specified limit to the depth of nesting. However, Questionnaire authors are encouraged to consider the impact on the user and user interface of overly deep nesting.

                                                                                      Control0..*
                                                                                      This element is affected by the following invariants: que-1
                                                                                      TypeSeettp://hl7.org/fhir/StructureDefinition/Questionnaire#Questionnaire.item
                                                                                      Is Modifierfalse
                                                                                      Must Supporttrue
                                                                                      Summaryfalse
                                                                                      Requirements

                                                                                      Reports can consist of complex nested groups.

                                                                                      Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))