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: Supporting Evidence Definition

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

Specifies an expression that when evaluated, returns supporting evidence. The expression may be the name of an expression defined in a measure library. If qualified it may be the name of an expression defined in any library referenced by a measure library. The expression is allowed to be a definition, or a function that takes a single argument of the same type as the population basis of the population in which it appears, in the same way that continuous variable measure observations function. The expression may return any type. The name element of the expression is required, and is used to provide a link from the MeasureReport back to the supporting evidence definition. The description element of the expression is optional, but if specified, is expected to be populated in the resulting supporting evidence in the measure report. Note also that the expression-coding extension may be used to provide a code on the expression if desired, and if specified is expected to be populated in the resulting supporting evidence.

This is an draft extension definition; the committee is seeking implementation feedback, and the definition or contents of the extension may change in future versions

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 Expression: Specifies an expression that when evaluated, returns supporting evidence. The expression may be the name of an expression defined in a measure library. If qualified it may be the name of an expression defined in any library referenced by a measure library. The expression is allowed to be a definition, or a function that takes a single argument of the same type as the population basis of the population in which it appears, in the same way that continuous variable measure observations function. The expression may return any type. The name element of the expression is required, and is used to provide a link from the MeasureReport back to the supporting evidence definition. The description element of the expression is optional, but if specified, is expected to be populated in the resulting supporting evidence in the measure report. Note also that the expression-coding extension may be used to provide a code on the expression if desired, and if specified is expected to be populated in the resulting supporting evidence.

    Maturity: 1

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..* Extension Supporting evidence
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/cqf-supportingEvidenceDefinition"
    ... value[x] 1..1 Expression Value of extension

    doco Documentation for this format
    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..* Extension Supporting evidence
    ... 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-supportingEvidenceDefinition"

    doco Documentation for this format

    This structure is derived from Extension

    Summary

    Simple Extension with the type Expression: Specifies an expression that when evaluated, returns supporting evidence. The expression may be the name of an expression defined in a measure library. If qualified it may be the name of an expression defined in any library referenced by a measure library. The expression is allowed to be a definition, or a function that takes a single argument of the same type as the population basis of the population in which it appears, in the same way that continuous variable measure observations function. The expression may return any type. The name element of the expression is required, and is used to provide a link from the MeasureReport back to the supporting evidence definition. The description element of the expression is optional, but if specified, is expected to be populated in the resulting supporting evidence in the measure report. Note also that the expression-coding extension may be used to provide a code on the expression if desired, and if specified is expected to be populated in the resulting supporting evidence.

    Maturity: 1

    Differential View

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..* Extension Supporting evidence
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/cqf-supportingEvidenceDefinition"
    ... value[x] 1..1 Expression Value of extension

    doco Documentation for this format

    Snapshot View

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..* Extension Supporting evidence
    ... 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-supportingEvidenceDefinition"

    doco Documentation for this format

     

    Other representations of profile: CSV, Excel, Schematron

    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 represented a little differently in R3:

    • Replace the type Expression with a set of extensions for the content of the type along with the _datatype extension
    Name Flags Card. Type Description & Constraints      Filter: Filters doco
    . . Extension 0..* Extension Supporting evidence
    . . . Slices for extension 0 ..* Extension Extension
    Slice: Unordered, Open by value:url
    . . . . extension:_datatype 1..1 (Complex) DataType name 'Expression' from R5
    URL: http://hl7.org/fhir/StructureDefinition/_datatype
    . . . . . value[x] 1.. 1 string Value of extension
    Fixed Value: Expression
    . . . . extension:description 0..1 Extension Natural language description of the condition
    . . . . . extension 0 .. 0 Extension
    . . . . . url 1 .. 1 uri "description"
    . . . . . value[x] 1.. 1 string Value of extension
    . . . . extension:name 0..1 Extension Short name assigned to expression for reuse
    . . . . . extension 0 .. 0 Extension
    . . . . . url 1 .. 1 uri "name"
    . . . . . value[x] 1.. 1 code Value of extension
    . . . . extension:language 0..1 Extension text/cql | text/fhirpath | application/x-fhir-query | etc.
    . . . . . extension 0 .. 0 Extension
    . . . . . url 1 .. 1 uri "language"
    . . . . . value[x] 1.. 1 code Value of extension
    Binding: ExpressionLanguage ( extensible ) : The media type of the expression language.
    Additional Bindings Purpose
    MimeTypes Max Binding
    . . . . extension:expression 0..1 Extension Expression in specified language
    . . . . . extension 0 .. 0 Extension
    . . . . . url 1 .. 1 uri "expression"
    . . . . . value[x] 1.. 1 string Value of extension
    . . . . extension:reference 0..1 Extension Where the expression is found
    . . . . . extension 0 .. 0 Extension
    . . . . . url 1 .. 1 uri "reference"
    . . . . . value[x] 1.. 1 uri Value of extension
    . . . url 1 .. 1 uri "http://hl7.org/fhir/StructureDefinition/cqf-supportingEvidenceDefinition"
    . . . value[x] 0 .. 0 Value of extension

    doco Documentation for this format

    Search Parameters for this Extension

    (none found)