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 . Page versions: R4B R4 R3

Extension: system

Vocabulary Work Group Maturity Level: 1InformativeUse Context: Any

URL for this extension: 

http://hl7.org/fhir/StructureDefinition/valueset-system

Status: draft. Extension maintained by: HL7

Allows a direct reference to the code system for FHIR query.

Context of Use: Use on element: ValueSet.compose.include.system

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

Extension Content

Summary

NameFlagsCard.TypeDescription & Constraintsdoco
.. extension0..1Reference(CodeSystem)URL = http://hl7.org/fhir/StructureDefinition/valueset-system
system: Allows a direct reference to the code system for FHIR query.
Use on element: ValueSet.compose.include.system

doco Documentation for this format

Full Structure

NameFlagsCard.TypeDescription & Constraintsdoco
.. extension0..1ExtensionURL = http://hl7.org/fhir/StructureDefinition/valueset-system
system: Allows a direct reference to the code system for FHIR query.
Use on element: ValueSet.compose.include.system
... url 1..1uri"http://hl7.org/fhir/StructureDefinition/valueset-system"
... valueReference 0..1Reference(CodeSystem)Value of extension

doco Documentation for this format

XML Template

<!-- system -->doco

<extension xmlns="http://hl7.org/fhir"
     url="http://hl7.org/fhir/StructureDefinition/valueset-system" >
  <!-- from Element: extension -->
 <valueReference><!-- 0..1 Reference(CodeSystem) Value of extension --></valueReference>
</extension>

JSON Template

{ // system
  // from Element: extension
    "extension" : [ //  sliced by value:url  in the specified order, Open ]
    "url" : "http://hl7.org/fhir/StructureDefinition/valueset-system", // R! 
    "valueReference" : { Reference(CodeSystem) } //Value of extension
  }

Summary

NameFlagsCard.TypeDescription & Constraintsdoco
.. extension0..1Reference(CodeSystem)URL = http://hl7.org/fhir/StructureDefinition/valueset-system
system: Allows a direct reference to the code system for FHIR query.
Use on element: ValueSet.compose.include.system

doco Documentation for this format

Full Structure

NameFlagsCard.TypeDescription & Constraintsdoco
.. extension0..1ExtensionURL = http://hl7.org/fhir/StructureDefinition/valueset-system
system: Allows a direct reference to the code system for FHIR query.
Use on element: ValueSet.compose.include.system
... url 1..1uri"http://hl7.org/fhir/StructureDefinition/valueset-system"
... valueReference 0..1Reference(CodeSystem)Value of extension

doco Documentation for this format

XML Template

<!-- system -->doco

<extension xmlns="http://hl7.org/fhir"
     url="http://hl7.org/fhir/StructureDefinition/valueset-system" >
  <!-- from Element: extension -->
 <valueReference><!-- 0..1 Reference(CodeSystem) Value of extension --></valueReference>
</extension>

JSON Template

{ // system
  // from Element: extension
    "extension" : [ //  sliced by value:url  in the specified order, Open ]
    "url" : "http://hl7.org/fhir/StructureDefinition/valueset-system", // R! 
    "valueReference" : { Reference(CodeSystem) } //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')]))