FHIR Extensions Pack
5.2.0-ballot - 5.2.0 Ballot - September 2024) International flag

FHIR Extensions Pack, published by HL7 International / FHIR Infrastructure. This guide is not an authorized publication; it is the continuous build for version 5.2.0-ballot 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

Extension: ValueSet Expression

Official URL: http://hl7.org/fhir/StructureDefinition/valueset-expression Version: 5.2.0-ballot
Standards status: Trial-use Maturity Level: 3 Responsible: HL7 International / Terminology Infrastructure Computable Name: VSExpression
Other Identifiers: OID:2.16.840.1.113883.4.642.5.1211

An expression that provides an alternative definition of the content of the value set (compose). There are two different ways to use this expression extension: If both an expression (this extension) and a compose element is present, the compose is understood to make the same statement as the expression. If there is no compose, the expression is the only definition of the value set and the ValueSet definition (compose) can only be evaluated by a system that understands the syntax used in the expression.

Context of Use

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

  • Element ID ValueSet

Usage info

Usage:

Changes since version 1.0.0:

  • The resource metadata has changed (publisher, description)

    • 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: An expression that provides an alternative definition of the content of the value set (compose). There are two different ways to use this expression extension: If both an expression (this extension) and a compose element is present, the compose is understood to make the same statement as the expression. If there is no compose, the expression is the only definition of the value set and the ValueSet definition (compose) can only be evaluated by a system that understands the syntax used in the expression.

    Maturity: 3

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraintsdoco
    .. Extension 0..1 Extension An alternative computable expression of the value set content
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/valueset-expression"
    ... value[x] 1..1 Expression Value of extension

    doco Documentation for this format
    NameFlagsCard.TypeDescription & Constraintsdoco
    .. Extension 0..1 Extension An alternative computable expression of the value set content
    ... id 0..1 id Unique id for inter-element referencing
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/valueset-expression"

    doco Documentation for this format

    This structure is derived from Extension

    Summary

    Simple Extension of type Expression: An expression that provides an alternative definition of the content of the value set (compose). There are two different ways to use this expression extension: If both an expression (this extension) and a compose element is present, the compose is understood to make the same statement as the expression. If there is no compose, the expression is the only definition of the value set and the ValueSet definition (compose) can only be evaluated by a system that understands the syntax used in the expression.

    Maturity: 3

    Differential View

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraintsdoco
    .. Extension 0..1 Extension An alternative computable expression of the value set content
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/valueset-expression"
    ... value[x] 1..1 Expression Value of extension

    doco Documentation for this format

    Snapshot View

    NameFlagsCard.TypeDescription & Constraintsdoco
    .. Extension 0..1 Extension An alternative computable expression of the value set content
    ... id 0..1 id Unique id for inter-element referencing
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/valueset-expression"

    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()

    Search Parameters for this Extension

    (none found)