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Extension: Variable

FHIR Infrastructure Work Group Maturity Level: 1InformativeUse Context: Any

Summary

Defining URL:http://hl7.org/fhir/StructureDefinition/variable
Version:5.0.0-cibuild
Name:Variable
Title:Variable
Modifier:This extension is not a modifier extension
Status:draft
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.
Committee:FHIR Infrastructure Work Group

Status: draft. Extension maintained by: Health Level Seven International (FHIR Infrastructure)

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.

Comment:

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.

Context of Use: Use on Element ID Questionnaire, Element ID Questionnaire.item, Element ID Questionnaire.item.item, Element ID PlanDefinition, Element ID PlanDefinition.action, Element ID PlanDefinition.action.action, Element ID RequestOrchestration, Element ID RequestOrchestration.action, Element ID RequestOrchestration.action.action, Element ID ActivityDefinition, Element ID Measure, Element ID Measure.group or Element ID Measure.group.population

Extension Content

Summary

NameFlagsCard.TypeDescription & Constraintsdoco
.. Variable0..*ExpressionURL = http://hl7.org/fhir/StructureDefinition/variable
Variable: 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.


Use on Element ID Questionnaire, Element ID Questionnaire.item, Element ID Questionnaire.item.item, Element ID PlanDefinition, Element ID PlanDefinition.action, Element ID PlanDefinition.action.action, Element ID RequestOrchestration, Element ID RequestOrchestration.action, Element ID RequestOrchestration.action.action, Element ID ActivityDefinition, Element ID Measure, Element ID Measure.group or Element ID Measure.group.population

doco Documentation for this format

Full Structure

NameFlagsCard.TypeDescription & Constraintsdoco
.. extension0..*ExtensionURL = http://hl7.org/fhir/StructureDefinition/variable
Variable: 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.


Use on Element ID Questionnaire, Element ID Questionnaire.item, Element ID Questionnaire.item.item, Element ID PlanDefinition, Element ID PlanDefinition.action, Element ID PlanDefinition.action.action, Element ID RequestOrchestration, Element ID RequestOrchestration.action, Element ID RequestOrchestration.action.action, Element ID ActivityDefinition, Element ID Measure, Element ID Measure.group or Element ID Measure.group.population
... extension 0..0
... url 1..1uri"http://hl7.org/fhir/StructureDefinition/variable"
... value[x] 1..1ExpressionValue of extension

doco Documentation for this format

XML Template

<!-- Variable -->doco

<extension xmlns="http://hl7.org/fhir"
     url="http://hl7.org/fhir/StructureDefinition/variable" >
  <!-- from Element: extension -->
 <valueExpression><!-- I 1..1 Expression Value of extension --></valueExpression>
</extension>

JSON Template

{ // Variable
  // from Element: extension
    "extension" : [ //  sliced by value:url  in the specified order, Open ]
  // extension: Extension: Prohibited
    "url" : "http://hl7.org/fhir/StructureDefinition/variable", // R! 
    "valueExpression" : { Expression } // I R! Value of extension
  }

Summary

NameFlagsCard.TypeDescription & Constraintsdoco
.. Variable0..*ExpressionURL = http://hl7.org/fhir/StructureDefinition/variable
Variable: 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.


Use on Element ID Questionnaire, Element ID Questionnaire.item, Element ID Questionnaire.item.item, Element ID PlanDefinition, Element ID PlanDefinition.action, Element ID PlanDefinition.action.action, Element ID RequestOrchestration, Element ID RequestOrchestration.action, Element ID RequestOrchestration.action.action, Element ID ActivityDefinition, Element ID Measure, Element ID Measure.group or Element ID Measure.group.population

doco Documentation for this format

Full Structure

NameFlagsCard.TypeDescription & Constraintsdoco
.. extension0..*ExtensionURL = http://hl7.org/fhir/StructureDefinition/variable
Variable: 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.


Use on Element ID Questionnaire, Element ID Questionnaire.item, Element ID Questionnaire.item.item, Element ID PlanDefinition, Element ID PlanDefinition.action, Element ID PlanDefinition.action.action, Element ID RequestOrchestration, Element ID RequestOrchestration.action, Element ID RequestOrchestration.action.action, Element ID ActivityDefinition, Element ID Measure, Element ID Measure.group or Element ID Measure.group.population
... extension 0..0
... url 1..1uri"http://hl7.org/fhir/StructureDefinition/variable"
... value[x] 1..1ExpressionValue of extension

doco Documentation for this format

XML Template

<!-- Variable -->doco

<extension xmlns="http://hl7.org/fhir"
     url="http://hl7.org/fhir/StructureDefinition/variable" >
  <!-- from Element: extension -->
 <valueExpression><!-- I 1..1 Expression Value of extension --></valueExpression>
</extension>

JSON Template

{ // Variable
  // from Element: extension
    "extension" : [ //  sliced by value:url  in the specified order, Open ]
  // extension: Extension: Prohibited
    "url" : "http://hl7.org/fhir/StructureDefinition/variable", // R! 
    "valueExpression" : { Expression } // I R! Value of extension
  }

 

Constraints

  • ele-1: All FHIR elements must have a @value or children (xpath: @value|f:*|h:div)
  • ext-1: Must have either extensions or value[x], not both (xpath: exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')]))
  • var-1: Variable expressions must have a name (xpath: exists(f:valueExpression/f:name))
  • ele-1: On Extension.extension: All FHIR elements must have a @value or children (xpath on Extension.extension: @value|f:*|h:div)
  • ext-1: On Extension.extension: Must have either extensions or value[x], not both (xpath on Extension.extension: exists(f:extension)!=exists(f:*[starts-with(local-name(.), "value")]))
  • ele-1: On Extension.value[x]: All FHIR elements must have a @value or children (xpath on Extension.value[x]: @value|f:*|h:div)

Search

No Search Extensions defined for this resource

Examples of this extension

No examples found.