Structured Data Capture
3.0.0-preview - STU 3 International flag

This page is part of the Structured Data Capture FHIR IG (v3.0.0-preview: STU 3 Draft) based on FHIR R4. The current version which supercedes this version is 3.0.0. For a full list of available versions, see the Directory of published versions

Extension: Enable when expression

Official URL: http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-enableWhenExpression Version: 3.0.0-preview
Standards status: Trial-use Maturity Level: 3 Computable Name: EnableWhenExpressionExtension

An expression that returns a boolean value for whether to enable the item. If the expression does not resolve to a boolean, it is considered an error in the design of the Questionnaire. Form renderer behavior is undefined. Some tools may attempt to force the value to be a boolean (e.g. is it a non-empty collection, non-null, non-zero - if so, then true). Systems SHOULD present a warning to the user if a non-boolean valued expression result does not trigger an all-out error.

Context of Use

This extension may be used on the following element(s):

  • Questionnaire.item
  • ElementDefinition

Additional details on the use of this extension can be found on the Form Behavior page.

Usage info

Usage:

Formal Views of Extension Content

Description of Profiles, Differentials, Snapshots, and how the XML and JSON presentations work.

This structure is derived from Extension

Summary

Fixed Value: 1 element

Maturity: 3

This structure is derived from Extension

NameFlagsCard.TypeDescription & Constraintsdoco
.. Extension 0..1ExtensionExpression for when to enable the item
... url 1..1uri"http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-enableWhenExpression"
... value[x] I0..1ExpressionValue of extension

doco Documentation for this format
NameFlagsCard.TypeDescription & Constraintsdoco
.. Extension 0..1ExtensionExpression for when to enable the item
... id 0..1stringUnique id for inter-element referencing
... Slices for extension 0..*ExtensionAdditional content defined by implementations
Slice: Unordered, Open by value:url
... url 1..1uri"http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-enableWhenExpression"

doco Documentation for this format

This structure is derived from Extension

Summary

Fixed Value: 1 element

Maturity: 3

Differential View

This structure is derived from Extension

NameFlagsCard.TypeDescription & Constraintsdoco
.. Extension 0..1ExtensionExpression for when to enable the item
... url 1..1uri"http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-enableWhenExpression"
... value[x] I0..1ExpressionValue of extension

doco Documentation for this format

Snapshot View

NameFlagsCard.TypeDescription & Constraintsdoco
.. Extension 0..1ExtensionExpression for when to enable the item
... id 0..1stringUnique id for inter-element referencing
... Slices for extension 0..*ExtensionAdditional content defined by implementations
Slice: Unordered, Open by value:url
... url 1..1uri"http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-enableWhenExpression"

doco Documentation for this format

 

Other representations of profile: CSV, Excel, Schematron

Constraints

IdGradePathDetailsRequirements
ele-1errorExtensionAll FHIR elements must have a @value or children
: hasValue() or (children().count() > id.count())
ext-1errorExtensionMust have either extensions or value[x], not both
: extension.exists() != value.exists()
ele-1errorExtension.extensionAll FHIR elements must have a @value or children
: hasValue() or (children().count() > id.count())
ext-1errorExtension.extensionMust have either extensions or value[x], not both
: extension.exists() != value.exists()
ele-1errorExtension.value[x]All FHIR elements must have a @value or children
: hasValue() or (children().count() > id.count())
inv-1errorExtension.value[x]FHIR query language not allowed.
: language!='application/x-fhir-query'