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

Extension: Max value set

Official URL: http://hl7.org/fhir/StructureDefinition/elementdefinition-maxValueSet Version: 5.3.0-ballot-tc1
Standards status: Deprecated Maturity Level: 3 Computable Name: MaxValueSet
Other Identifiers: OID:2.16.840.1.113883.4.642.5.1593

This acts as an overall 'required' binding for an element that already has a less restrictive binding. It is used when there is a desire to have a 'small' enumerable binding that meets most needs and where the overall value set that the codes must be drawn from is 'infinite'. The the base less restrictive binding SHALL be a proper subset of the max binding valueset. In most cases, this extension is used where the base binding is 'extensible'. DEPRECATED: Use additionalBinding extension or element instead

Context of Use

This extension is deprecated and should no longer be used

Use additionalBinding extension or element instead

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:

  • 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 with the type uri, canonical: This acts as an overall 'required' binding for an element that already has a less restrictive binding. It is used when there is a desire to have a 'small' enumerable binding that meets most needs and where the overall value set that the codes must be drawn from is 'infinite'. The the base less restrictive binding SHALL be a proper subset of the max binding valueset. In most cases, this extension is used where the base binding is 'extensible'. DEPRECATED: Use additionalBinding extension or element instead

    Maturity: 3

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension Maximum Value Set (when strength = extensible)
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/elementdefinition-maxValueSet"
    ... value[x] 1..1 Value of extension
    .... valueUri uri
    .... valueCanonical canonical(ValueSet)

    doco Documentation for this format
    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension Maximum Value Set (when strength = extensible)
    ... id 0..1 id Unique id for inter-element referencing
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/elementdefinition-maxValueSet"
    .... valueUri uri
    .... valueCanonical canonical(ValueSet)

    doco Documentation for this format

    This structure is derived from Extension

    Summary

    Simple Extension with the type uri, canonical: This acts as an overall 'required' binding for an element that already has a less restrictive binding. It is used when there is a desire to have a 'small' enumerable binding that meets most needs and where the overall value set that the codes must be drawn from is 'infinite'. The the base less restrictive binding SHALL be a proper subset of the max binding valueset. In most cases, this extension is used where the base binding is 'extensible'. DEPRECATED: Use additionalBinding extension or element instead

    Maturity: 3

    Differential View

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension Maximum Value Set (when strength = extensible)
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/elementdefinition-maxValueSet"
    ... value[x] 1..1 Value of extension
    .... valueUri uri
    .... valueCanonical canonical(ValueSet)

    doco Documentation for this format

    Snapshot View

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension Maximum Value Set (when strength = extensible)
    ... id 0..1 id Unique id for inter-element referencing
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/elementdefinition-maxValueSet"
    .... valueUri uri
    .... valueCanonical canonical(ValueSet)

    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 not used in R4B

    • Duplicate Resource http://hl7.org/fhir/StructureDefinition/elementdefinition-maxValueSet of type StructureDefinition (existing version 4.3.0, new version 5.3.0-ballot-tc1)

    R4

    The extension is not used in R4

    • Duplicate Resource http://hl7.org/fhir/StructureDefinition/elementdefinition-maxValueSet of type StructureDefinition (existing version 4.0.1, new version 5.3.0-ballot-tc1)

    R3

    The extension is not used in R3

    • Map the type canonical to uri on the element Extension.value[x]
    • Note: Extensions that have been modified for R3 are still draft while real-world experience is collected
    • Duplicate Resource http://hl7.org/fhir/StructureDefinition/elementdefinition-maxValueSet of type StructureDefinition (existing version null, new version 5.3.0-ballot-tc1)

    Search Parameters for this Extension

    (none found)