FHIR Extensions Pack
5.3.0-ballot-tc1 - (September 2025 Ballot) International flag

This page is part of the FHIR Core Extensions Registry (v5.3.0-ballot-tc1: Release 5.3) based on FHIR (HL7® FHIR® Standard) v5.0.0. This version is a pre-release. The current official version is 5.2.0. For a full list of available versions, see the Directory of published versions

Extension: Library Alias

Official URL: http://hl7.org/fhir/StructureDefinition/cqf-libraryAlias Version: 5.3.0-ballot-tc1
Standards status: Trial-use Maturity Level: 1 Responsible: HL7 International / Clinical Decision Support Computable Name: LibraryAlias

Specifies the alias to be used for the library on which it appears. This is useful when multiple libraries have the same unqualified name, and allows in-line CQL expressions to refer to the libraries via their alias, rather than the default of the unqualified name of the library.

Context of Use

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

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

Changes since version 5.2.0:

  • New Content

    • 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 with the type string: Specifies the alias to be used for the library on which it appears. This is useful when multiple libraries have the same unqualified name, and allows in-line CQL expressions to refer to the libraries via their alias, rather than the default of the unqualified name of the library.

    Maturity: 1

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension Alternate name for library
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/cqf-libraryAlias"
    ... value[x] 1..1 string Value of extension

    doco Documentation for this format
    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension Alternate name for library
    ... id 0..1 id Unique id for inter-element referencing
    ... extension 0..* Extension Additional content defined by implementations
    Slice: Unordered, Open by value:url
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/cqf-libraryAlias"

    doco Documentation for this format

    This structure is derived from Extension

    Summary

    Simple Extension with the type string: Specifies the alias to be used for the library on which it appears. This is useful when multiple libraries have the same unqualified name, and allows in-line CQL expressions to refer to the libraries via their alias, rather than the default of the unqualified name of the library.

    Maturity: 1

    Differential View

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension Alternate name for library
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/cqf-libraryAlias"
    ... value[x] 1..1 string Value of extension

    doco Documentation for this format

    Snapshot View

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension Alternate name for library
    ... id 0..1 id Unique id for inter-element referencing
    ... extension 0..* Extension Additional content defined by implementations
    Slice: Unordered, Open by value:url
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/cqf-libraryAlias"

    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()

    R4B

    The extension is unchanged in R4B

    R4

    The extension is unchanged in R4

    R3

    The extension is unchanged in R3

    Search Parameters for this Extension

    (none found)