R4 Draft for Comment

This page is part of the FHIR Specification (v3.2.0: R4 Ballot 1). The current version which supercedes this version is 5.0.0. For a full list of available versions, see the Directory of published versions

Extension: reference

Vocabulary Work Group

Maturity Level: 1

Informative

Use Context: Any

URL for this extension:

http://hl7.org/fhir/StructureDefinition/codesystem-reference

Status: draft. Extension maintained by: HL7

A logical reference (e.g. a reference to CodeSystem.url) that identifies the value set/version that identifies the set of possible coded values this coding was chosen from or constrained by.

Context of Use: Use on data type: Coding

usage info: insert a list of places where this extension is used

Summary

Name	Flags	Card.	Type	Description & Constraints
extension		0..1	uri	URL = http://hl7.org/fhir/StructureDefinition/codesystem-reference reference: A logical reference (e.g. a reference to CodeSystem.url) that identifies the value set/version that identifies the set of possible coded values this coding was chosen from or constrained by. Use on data type: Coding
Documentation for this format

Full Structure

Name	Card.	Type	Description & Constraints
extension	0..1	Extension	URL = http://hl7.org/fhir/StructureDefinition/codesystem-reference reference: A logical reference (e.g. a reference to CodeSystem.url) that identifies the value set/version that identifies the set of possible coded values this coding was chosen from or constrained by. Use on data type: Coding
url	1..1	uri	"http://hl7.org/fhir/StructureDefinition/codesystem-reference"
valueUri	0..1	uri	Value of extension
Documentation for this format

XML Template

<!-- reference -->

<extension xmlns="http://hl7.org/fhir"
     url="http://hl7.org/fhir/StructureDefinition/codesystem-reference" >
  <!-- from Element: extension -->
 <valueUri value="[uri]"/><!-- 0..1 Value of extension -->
</extension>

JSON Template

{ // reference
  // from Element: extension
    "extension" : [ //  sliced by value:url  in the specified order, Open ]
    "url" : "http://hl7.org/fhir/StructureDefinition/codesystem-reference", // R! 
    "valueUri" : "<uri>" //Value of extension
  }

Summary

Name	Flags	Card.	Type	Description & Constraints
extension		0..1	uri	URL = http://hl7.org/fhir/StructureDefinition/codesystem-reference reference: A logical reference (e.g. a reference to CodeSystem.url) that identifies the value set/version that identifies the set of possible coded values this coding was chosen from or constrained by. Use on data type: Coding
Documentation for this format

Full Structure

Name	Card.	Type	Description & Constraints
extension	0..1	Extension	URL = http://hl7.org/fhir/StructureDefinition/codesystem-reference reference: A logical reference (e.g. a reference to CodeSystem.url) that identifies the value set/version that identifies the set of possible coded values this coding was chosen from or constrained by. Use on data type: Coding
url	1..1	uri	"http://hl7.org/fhir/StructureDefinition/codesystem-reference"
valueUri	0..1	uri	Value of extension
Documentation for this format

XML Template

<!-- reference -->

<extension xmlns="http://hl7.org/fhir"
     url="http://hl7.org/fhir/StructureDefinition/codesystem-reference" >
  <!-- from Element: extension -->
 <valueUri value="[uri]"/><!-- 0..1 Value of extension -->
</extension>

JSON Template

{ // reference
  // from Element: extension
    "extension" : [ //  sliced by value:url  in the specified order, Open ]
    "url" : "http://hl7.org/fhir/StructureDefinition/codesystem-reference", // R! 
    "valueUri" : "<uri>" //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')]))