FHIR Extensions Pack
5.1.0 - 5.1.0 (April 2024) International flag

This page is part of the FHIR Core Extensions Registry (v5.1.0: Release 5.1) based on FHIR (HL7® FHIR® Standard) v5.0.0. This is the current published version in its permanent home (it will always be available at this URL). For a full list of available versions, see the Directory of published versions

Extension: Variable

Official URL: http://hl7.org/fhir/StructureDefinition/variable Version: 5.1.0
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
  • Element ID RequestOrchestration.action
  • Element ID ActivityDefinition
  • Element ID Measure
  • Element ID Measure.group
  • Element ID Measure.group.population

Usage info

Usage:

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

Changes since version 1.0.0:

  • No changes

    • 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

    Simple Extension of type Expression: 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.

    Maturity: 3

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraintsdoco
    .. Extension C 0..* Extension Variable for processing
    var-1: Variable expressions must have a name
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/variable"
    ... value[x] 1..1 Expression Value of extension

    doco Documentation for this format
    NameFlagsCard.TypeDescription & Constraintsdoco
    .. Extension C 0..* Extension Variable for processing
    var-1: Variable expressions must have a name
    ... id 0..1 id Unique id for inter-element referencing
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/variable"

    doco Documentation for this format

    This structure is derived from Extension

    Summary

    Simple Extension of type Expression: 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.

    Maturity: 3

    Differential View

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraintsdoco
    .. Extension C 0..* Extension Variable for processing
    var-1: Variable expressions must have a name
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/variable"
    ... value[x] 1..1 Expression Value of extension

    doco Documentation for this format

    Snapshot View

    NameFlagsCard.TypeDescription & Constraintsdoco
    .. Extension C 0..* Extension Variable for processing
    var-1: Variable expressions must have a name
    ... id 0..1 id Unique id for inter-element referencing
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/variable"

    doco Documentation for this format

     

    Other representations of profile: CSV, Excel, Schematron

    Constraints

    IdGradePath(s)DetailsRequirements
    ele-1error**ALL** elementsAll FHIR elements must have a @value or children
    : hasValue() or (children().count() > id.count())
    ext-1error**ALL** extensionsMust have either extensions or value[x], not both
    : extension.exists() != value.exists()
    var-1errorExtensionVariable expressions must have a name
    : value.name.exists()

    Search Parameters for this Extension

    (none found)