This page is part of the FHIR Specification (v4.5.0: R5 Preview #3). The current version which supercedes this version is 5.0.0. For a full list of available versions, see the Directory of published versions . Page versions: R4B R4

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Extension: unitValueSet

URL for this extension:

http://hl7.org/fhir/StructureDefinition/questionnaire-unitValueSet

Status: draft. Extension maintained by: HL7

A set of units that the user may choose when providing a quantity value.

Comment:

Provide either unitOption(s) or unitValueSet. If either of the extensions are present, the units for a Quantity element are constrained to only the units listed by the extensions - i.e. it is treated as a "required", not an "extensible" binding. In the absence of either, any unit is valid.

Context of Use: Use on Element ID Questionnaire.item or Element ID Questionnaire.item.item, with Context Invariant = type='quantity'

Extension Content

• Summary
• Full Structure
• XML
• JSON
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Summary

Name	Flags	Card.	Type	Description & Constraints
unitValueSet		0..1	canonical(ValueSet)	URL = http://hl7.org/fhir/StructureDefinition/questionnaire-unitValueSet unitValueSet: A set of units that the user may choose when providing a quantity value. Use on Element ID Questionnaire.item or Element ID Questionnaire.item.item, with <a href="structuredefinition-definitions.html#StructureDefinition.contextInvariant">Context Invariant</a> = <code>type='quantity'</code>
Documentation for this format

Full Structure

Name	Flags	Card.	Type	Description & Constraints
extension		0..1	Extension	URL = http://hl7.org/fhir/StructureDefinition/questionnaire-unitValueSet unitValueSet: A set of units that the user may choose when providing a quantity value. Use on Element ID Questionnaire.item or Element ID Questionnaire.item.item, with <a href="structuredefinition-definitions.html#StructureDefinition.contextInvariant">Context Invariant</a> = <code>type='quantity'</code>
extension	I	0..0
url		1..1	uri	"http://hl7.org/fhir/StructureDefinition/questionnaire-unitValueSet"
value[x]	I	1..1	canonical(ValueSet)	Value of extension
Documentation for this format

XML Template

<!-- unitValueSet -->

<extension xmlns="http://hl7.org/fhir"
     url="http://hl7.org/fhir/StructureDefinition/questionnaire-unitValueSet" >
  <!-- from Element: extension -->
 <valueCanonical value="[canonical]"/><!--  1..1 Value of extension -->
</extension>

JSON Template

{ // unitValueSet
  // from Element: extension
    "extension" : [ //  sliced by value:url  in the specified order, Open ]
    "url" : "http://hl7.org/fhir/StructureDefinition/questionnaire-unitValueSet", // R! 
    "valueCanonical" : "<canonical>" // C? R! Value of extension
  }

Summary

Name	Flags	Card.	Type	Description & Constraints
unitValueSet		0..1	canonical(ValueSet)	URL = http://hl7.org/fhir/StructureDefinition/questionnaire-unitValueSet unitValueSet: A set of units that the user may choose when providing a quantity value. Use on Element ID Questionnaire.item or Element ID Questionnaire.item.item, with <a href="structuredefinition-definitions.html#StructureDefinition.contextInvariant">Context Invariant</a> = <code>type='quantity'</code>
Documentation for this format

Full Structure

Name	Flags	Card.	Type	Description & Constraints
extension		0..1	Extension	URL = http://hl7.org/fhir/StructureDefinition/questionnaire-unitValueSet unitValueSet: A set of units that the user may choose when providing a quantity value. Use on Element ID Questionnaire.item or Element ID Questionnaire.item.item, with <a href="structuredefinition-definitions.html#StructureDefinition.contextInvariant">Context Invariant</a> = <code>type='quantity'</code>
extension	I	0..0
url		1..1	uri	"http://hl7.org/fhir/StructureDefinition/questionnaire-unitValueSet"
value[x]	I	1..1	canonical(ValueSet)	Value of extension
Documentation for this format

XML Template

<!-- unitValueSet -->

<extension xmlns="http://hl7.org/fhir"
     url="http://hl7.org/fhir/StructureDefinition/questionnaire-unitValueSet" >
  <!-- from Element: extension -->
 <valueCanonical value="[canonical]"/><!--  1..1 Value of extension -->
</extension>

JSON Template

{ // unitValueSet
  // from Element: extension
    "extension" : [ //  sliced by value:url  in the specified order, Open ]
    "url" : "http://hl7.org/fhir/StructureDefinition/questionnaire-unitValueSet", // R! 
    "valueCanonical" : "<canonical>" // C? R! Value of extension
  }

Constraints

• ele-1: All FHIR elements must have a @value or children (xpath: @value|f:*|h:div)
• ext-1: Must have either extensions or value[x], not both (xpath: exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')]))
• ele-1: On Extension.extension: All FHIR elements must have a @value or children (xpath on Extension.extension: @value|f:*|h:div)
• ext-1: On Extension.extension: Must have either extensions or value[x], not both (xpath on Extension.extension: exists(f:extension)!=exists(f:*[starts-with(local-name(.), "value")]))
• ele-1: On Extension.value[x]: All FHIR elements must have a @value or children (xpath on Extension.value[x]: @value|f:*|h:div)