Structured Data Capture
4.0.0 - STU 4
Structured Data Capture
4.0.0 - STU 4
This page is part of the Structured Data Capture FHIR IG (v4.0.0: STU 4) based on FHIR (HL7® FHIR® Standard) R4. This is the current published version. For a full list of available versions, see the Directory of published versions
| Official URL: http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-unitSupplementalSystem | Version: 4.0.0 | ||||
| Standards status: Trial-use Active as of 2026-03-24 | Maturity Level: 4 | Computable Name: UnitSupplementalSystem | |||
| Other Identifiers: OID:2.16.840.1.113883.4.642.40.17.42.58 | |||||
If the questionnaire-unit-open extension indicates that additional units other than the set of options provided for the question are allowed, this indicates the code system those units are expected to be drawn from. This extension SHOULD be present on any question where questionnaire-unit-open allows additional coded values.
Context of Use
This extension may be used on the following element(s)
Questionnaire.item
ElementDefinition
Usage info
Usages:
You can also check for usages in the FHIR IG Statistics
Description Differentials, Snapshots, and other representations.
| Name | Flags | Card. | Type | Description & Constraints Filter:   |
|---|---|---|---|---|
  Extension |
0..1 | Extension | This extension indicates the code system the additional units are drawn from | |
  extension |
0..0 | Extension | ||
| url |
1..1 | uri | "http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-unitSupplementalSystem" | |
  value[x] |
1..1 | canonical() | Value of extension | |
| Documentation for this format | ||||
| Name | Flags | Card. | Type | Description & Constraints Filter: |
|---|---|---|---|---|
 Extension |
0..1 | Extension | This extension indicates the code system the additional units are drawn from | |
| id |
0..1 | string | Unique id for inter-element referencing | |
| extension |
0..0 | Extension Slice: Unordered, Open by value:url | ||
| url |
1..1 | uri | "http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-unitSupplementalSystem" | |
| value[x] |
1..1 | canonical() | Value of extension | |
| Documentation for this format | ||||
| 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()
|
Summary
Simple Extension with the type canonical: If the questionnaire-unit-open extension indicates that additional units other than the set of options provided for the question are allowed, this indicates the code system those units are expected to be drawn from. This extension SHOULD be present on any question where questionnaire-unit-open allows additional coded values.
Maturity: 4
Differential ViewDifferential View
| Name | Flags | Card. | Type | Description & Constraints Filter: |
|---|---|---|---|---|
| Extension |
0..1 | Extension | This extension indicates the code system the additional units are drawn from | |
| extension |
0..0 | Extension | ||
| url |
1..1 | uri | "http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-unitSupplementalSystem" | |
| value[x] |
1..1 | canonical() | Value of extension | |
| Documentation for this format | ||||
Snapshot View
| Name | Flags | Card. | Type | Description & Constraints Filter: |
|---|---|---|---|---|
| Extension |
0..1 | Extension | This extension indicates the code system the additional units are drawn from | |
| id |
0..1 | string | Unique id for inter-element referencing | |
| extension |
0..0 | Extension Slice: Unordered, Open by value:url | ||
| url |
1..1 | uri | "http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-unitSupplementalSystem" | |
| value[x] |
1..1 | canonical() | Value of extension | |
| Documentation for this format | ||||
| 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()
|
Summary
Simple Extension with the type canonical: If the questionnaire-unit-open extension indicates that additional units other than the set of options provided for the question are allowed, this indicates the code system those units are expected to be drawn from. This extension SHOULD be present on any question where questionnaire-unit-open allows additional coded values.
Maturity: 4
Other representations of profile: CSV, Excel, Schematron
IG © 2022+ HL7 International / FHIR Infrastructure.
Package hl7.fhir.uv.sdc#4.0.0 based on FHIR 4.0.1.
Generated
2026-03-24
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