FHIR Extensions Pack
5.4.0 - May 2026 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 5.4.0 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: StructureDefinition Work Group

Official URL: http://hl7.org/fhir/StructureDefinition/structuredefinition-wg Version: 5.4.0
Standards status: Trial-use Maturity Level: 3 Computable Name: SDWorkGroup
Other Identifiers: OID:2.16.840.1.113883.4.642.5.1025

The work group that owns and maintains this resource.

Context of Use

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

Usage info

Usages:

You can also check for usages in the FHIR IG Statistics

Changes since version 5.3.0:

  • The data elements list has changed

    • 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 code: The work group that owns and maintains this resource.

    Maturity: 3

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraints    Filter: doco
    Extension 0..1 Extension Owning Work Group
    Extension.extension 0..0 Extension
    Extension.url 1..1 uri "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg"
    Extension.value[x] 1..1 code Value of extension
    Binding: HL7 International Organizational Entities (required): An HL7 administrative unit that owns artifacts in the FHIR specification.

    doco Documentation for this format
    NameFlagsCard.TypeDescription & Constraints    Filter: doco
    Extension 0..1 Extension Owning Work Group
    Extension.id 0..1 id Unique id for inter-element referencing
    Extension.extension 0..0 Extension
    Slice: Unordered, Open by value:url

    Slicing Note: The rules on this element (including its children) apply to all the slices, but are not repeated in them
    Extension.url 1..1 uri "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg"
    Extension.value[x] 1..1 code Value of extension
    Binding: HL7 International Organizational Entities (required): An HL7 administrative unit that owns artifacts in the FHIR specification.

    doco Documentation for this format

    This structure is derived from Extension

    Summary

    Simple Extension with the type code: The work group that owns and maintains this resource.

    Maturity: 3

    Differential View

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraints    Filter: doco
    Extension 0..1 Extension Owning Work Group
    Extension.extension 0..0 Extension
    Extension.url 1..1 uri "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg"
    Extension.value[x] 1..1 code Value of extension
    Binding: HL7 International Organizational Entities (required): An HL7 administrative unit that owns artifacts in the FHIR specification.

    doco Documentation for this format

    Snapshot View

    NameFlagsCard.TypeDescription & Constraints    Filter: doco
    Extension 0..1 Extension Owning Work Group
    Extension.id 0..1 id Unique id for inter-element referencing
    Extension.extension 0..0 Extension
    Slice: Unordered, Open by value:url

    Slicing Note: The rules on this element (including its children) apply to all the slices, but are not repeated in them
    Extension.url 1..1 uri "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg"
    Extension.value[x] 1..1 code Value of extension
    Binding: HL7 International Organizational Entities (required): An HL7 administrative unit that owns artifacts in the FHIR specification.

    doco Documentation for this format

     

    Other representations of profile: CSV, Excel, Schematron

    Terminology Bindings

    Path Status Usage ValueSet Version Source
    Extension.value[x] Base required HL7 International Organizational Entities 📦1.0.1 THO v7.4

    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()

    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)