FHIR Extensions Pack, published by HL7 International / FHIR Infrastructure. This guide is not an authorized publication; it is the continuous build for version 5.3.0-ballot-tc1 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/fhir-extensions/ and changes regularly. See the Directory of published versions

• Content
• Detailed Descriptions
• Mappings
• XML
• JSON
• TTL

Extension: Variable

Official URL: http://hl7.org/fhir/StructureDefinition/variable				Version: 5.3.0-ballot-tc1
Standards status: Trial-use			Maturity Level: 3	Computable Name: Variable
Other Identifiers: OID:2.16.840.1.113883.4.642.5.1528

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.

Context of Use

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

• Element ID: Questionnaire
• Element ID: Questionnaire.item
• Element ID: PlanDefinition
• Element ID: PlanDefinition.action
• Element ID: RequestOrchestration (FHIR versions R5 and after)
• Element ID: RequestOrchestration.action (FHIR versions R5 and after)
• Element ID: RequestGroup (FHIR versions up to R4B )
• Element ID: RequestGroup.action (FHIR versions up to R4B )
• Element ID: ActivityDefinition
• Element ID: Measure
• Element ID: Measure.group
• Element ID: Measure.group.population

Usage info

Usages:

• This Extension is not used by any profiles in this Implementation Guide

You can also check for usages in the FHIR IG Statistics

Formal Views of Extension Content

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

 

Other representations of profile: CSV, Excel, Schematron

Constraints

Id	Grade	Path(s)	Description	Expression
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children	hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both	extension.exists() != value.exists()
var-1	error	Extension	Variable expressions must have a name	value.name.exists()

R4B

The extension is represented a little differently in R4B:

• Adjust the extension context RequestOrchestration to Basic
• Adjust the extension context RequestOrchestration.action to Basic
• Note: Extensions that have been modified for R4B are still draft while real-world experience is collected

Name	Flags	Card.	Type	Description & Constraints      Filter: Bindings Constraints Obligations
Extension	C	0..*	Extension	Variable for processing Constraints: var-1
extension		0 .. 0		Extension
url		1 .. 1	uri	"http://hl7.org/fhir/StructureDefinition/variable"
value[x]		1.. 1	Expression	Value of extension
Documentation for this format

R4

The extension is represented a little differently in R4:

• Adjust the extension context RequestOrchestration to Basic
• Adjust the extension context RequestOrchestration.action to Basic
• Note: Extensions that have been modified for R4 are still draft while real-world experience is collected

Name	Flags	Card.	Type	Description & Constraints      Filter: Bindings Constraints Obligations
Extension	C	0..*	Extension	Variable for processing Constraints: var-1
extension		0 .. 0		Extension
url		1 .. 1	uri	"http://hl7.org/fhir/StructureDefinition/variable"
value[x]		1.. 1	Expression	Value of extension
Documentation for this format

R3

The extension is represented a little differently in R3:

• Adjust the extension context RequestOrchestration to Basic
• Adjust the extension context RequestOrchestration.action to Basic
• Replace the type Expression with a set of extensions for the content of the type along with the _datatype extension
• Note: Extensions that have been modified for R3 are still draft while real-world experience is collected

Name	Flags	Card.	Type	Description & Constraints      Filter: Bindings Constraints Obligations
Extension	C	0..*	Extension	Variable for processing Constraints: var-1
Slices for extension		0 ..*	Extension	Extension Slice: Unordered, Open by value:url
extension:_datatype		1..1	(Complex)	DataType name 'Expression' from R5 URL: http://hl7.org/fhir/StructureDefinition/_datatype
value[x]		1.. 1	string	Value of extension Fixed Value: Expression
extension:description		0..1	Extension	Natural language description of the condition
extension		0 .. 0		Extension
url		1 .. 1	uri	"description"
value[x]		1.. 1	string	Value of extension
extension:name		0..1	Extension	Short name assigned to expression for reuse
extension		0 .. 0		Extension
url		1 .. 1	uri	"name"
value[x]		1.. 1	code	Value of extension
extension:language		0..1	Extension	text/cql | text/fhirpath | application/x-fhir-query | etc.
extension		0 .. 0		Extension
url		1 .. 1	uri	"language"
value[x]		1.. 1	code	Value of extension Binding: ExpressionLanguage ( extensible ) : The media type of the expression language. Additional Bindings Purpose MimeTypes Max Binding
extension:expression		0..1	Extension	Expression in specified language
extension		0 .. 0		Extension
url		1 .. 1	uri	"expression"
value[x]		1.. 1	string	Value of extension
extension:reference		0..1	Extension	Where the expression is found
extension		0 .. 0		Extension
url		1 .. 1	uri	"reference"
value[x]		1.. 1	uri	Value of extension
url		1 .. 1	uri	"http://hl7.org/fhir/StructureDefinition/variable"
value[x]		0 .. 0		Value of extension
Documentation for this format

Search Parameters for this Extension

(none found)