Release 4B

This page is part of the FHIR Specification (v4.3.0: R4B - STU). The current version which supercedes this version is 5.0.0. For a full list of available versions, see the Directory of published versions . Page versions: R4B R4

Extension: expression

FHIR Infrastructure Work Group Maturity Level: 1 Informative Use Context: Any

URL for this extension:

http://hl7.org/fhir/StructureDefinition/cqf-expression

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.

Context of Use: Use on Element ID Element

Summary

Name	Flags	Card.	Type	Description & Constraints doco
.. expression	0..*	Expression	URL = 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

Name	Flags	Card.	Type
.. extension	0..*	Extension	URL = 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..1	uri	"http://hl7.org/fhir/StructureDefinition/cqf-expression"
... value[x]	1..1	Expression	Value 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><!-- ?? 1..1 Expression  Value of extension --></valueExpression>
</extension>

JSON Template

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

Summary

Name	Flags	Card.	Type	Description & Constraints doco
.. expression	0..*	Expression	URL = 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

Name	Flags	Card.	Type
.. extension	0..*	Extension	URL = 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..1	uri	"http://hl7.org/fhir/StructureDefinition/cqf-expression"
... value[x]	1..1	Expression	Value 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><!-- ?? 1..1 Expression  Value of extension --></valueExpression>
</extension>

JSON Template

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

Constraints

ele-1: All FHIR elements must have a @value or children unless an empty Parameters resource (xpath: @value|f:*|h:div|self::f:Parameters)
ext-1: Must have either extensions or value[x], not both (xpath: exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')]))
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)