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Extension: expression

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

Summary

Defining URL:http://hl7.org/fhir/StructureDefinition/cqf-expression
Version:5.0.0-cibuild
Name:expression
Title:null
Modifier:This extension is not a modifier extension
Status:draft
Definition:An expression that, when evaluated, provides the value for the element on which it appears.
Committee:FHIR Infrastructure Work Group

Status: draft. Extension maintained by: Health Level Seven, Inc. - CDS WG

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

Comment:

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

Context of Use: Use on Element ID Element

Extension Content

Summary

NameFlagsCard.TypeDescription & Constraintsdoco
.. expression0..1ExpressionURL = http://hl7.org/fhir/StructureDefinition/cqf-expression
expression: An expression that, when evaluated, provides the value for the element on which it appears.


Use on Element ID Element

doco Documentation for this format

Full Structure

NameFlagsCard.TypeDescription & Constraintsdoco
.. extension0..1ExtensionURL = http://hl7.org/fhir/StructureDefinition/cqf-expression
expression: An expression that, when evaluated, provides the value for the element on which it appears.


Use on Element ID Element
... extension 0..0
... url 1..1uri"http://hl7.org/fhir/StructureDefinition/cqf-expression"
... value[x] 1..1ExpressionValue of extension

doco Documentation for this format

XML Template

<!-- expression -->doco

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

JSON Template

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

Summary

NameFlagsCard.TypeDescription & Constraintsdoco
.. expression0..1ExpressionURL = http://hl7.org/fhir/StructureDefinition/cqf-expression
expression: An expression that, when evaluated, provides the value for the element on which it appears.


Use on Element ID Element

doco Documentation for this format

Full Structure

NameFlagsCard.TypeDescription & Constraintsdoco
.. extension0..1ExtensionURL = http://hl7.org/fhir/StructureDefinition/cqf-expression
expression: An expression that, when evaluated, provides the value for the element on which it appears.


Use on Element ID Element
... extension 0..0
... url 1..1uri"http://hl7.org/fhir/StructureDefinition/cqf-expression"
... value[x] 1..1ExpressionValue of extension

doco Documentation for this format

XML Template

<!-- expression -->doco

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

JSON Template

{ // expression
  // from Element: extension
    "extension" : [ //  sliced by value:url  in the specified order, Open ]
  // extension: Extension: Prohibited
    "url" : "http://hl7.org/fhir/StructureDefinition/cqf-expression", // 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: )
  • 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