BioMaxis Implementation Guide
0.0.0-semantic-release - ci-build

BioMaxis Implementation Guide - Local Development build (v0.0.0-semantic-release) built by the FHIR (HL7® FHIR® Standard) Build Tools. See the Directory of published versions

Extension: Questionnaire Item Unit Expression

Official URL: http://biomaxis.com/fhir/StructureDefinition/questionnaire-item-unit-expression Version: 0.0.0-semantic-release
Draft as of 2026-02-04 Computable Name: QuestionnaireItemUnitExpression

This extension provides an expression to calculate unit options for quantity inputs. Only applicable to items where type='quantity'.

Context of Use

Usage info

Usages:

You can also check for usages in the FHIR IG Statistics

Formal Views of Extension Content

Description of Profiles, Differentials, Snapshots, and how the XML and JSON presentations work.

This structure is derived from Extension

NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
.. Extension 0..* Extension Questionnaire Item Unit Expression
... extension 0..0 Extension
... url 1..1 uri "http://biomaxis.com/fhir/StructureDefinition/questionnaire-item-unit-expression"
... value[x] 1..1 Expression Value of extension

doco Documentation for this format
NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
.. Extension 0..* Extension Questionnaire Item Unit Expression
... 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://biomaxis.com/fhir/StructureDefinition/questionnaire-item-unit-expression"

doco Documentation for this format

This structure is derived from Extension

Summary

Simple Extension with the type Expression: This extension provides an expression to calculate unit options for quantity inputs. Only applicable to items where type='quantity'.

Differential View

This structure is derived from Extension

NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
.. Extension 0..* Extension Questionnaire Item Unit Expression
... extension 0..0 Extension
... url 1..1 uri "http://biomaxis.com/fhir/StructureDefinition/questionnaire-item-unit-expression"
... value[x] 1..1 Expression Value of extension

doco Documentation for this format

Snapshot View

NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
.. Extension 0..* Extension Questionnaire Item Unit Expression
... 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://biomaxis.com/fhir/StructureDefinition/questionnaire-item-unit-expression"

doco Documentation for this format

This structure is derived from Extension

Summary

Simple Extension with the type Expression: This extension provides an expression to calculate unit options for quantity inputs. Only applicable to items where type='quantity'.

 

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()