R4 Ballot #1 (Mixed Normative/Trial use) Release 5 Preview #2
This page is part of the FHIR Specification (v3.3.0: R4 Ballot 2). The current version which supercedes this version is 4.0.1 . For a full list of available versions, see the Directory of published versions

Extension: system

Vocabulary Work Group   Maturity Level : 1 Informative Use 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 ID ValueSet.compose.include.system

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

Extension Content

Summary

Name Flags Card. Type Description & Constraints doco
. . extension system 0..1 canonical ( CodeSystem ) URL = http://hl7.org/fhir/StructureDefinition/valueset-system
system: Allows a direct reference to the code system for FHIR query.


Use on Element ID ValueSet.compose.include.system

doco Documentation for this format

Full Structure

Name Flags Card. Type Description & Constraints doco
. . extension 0..1 Extension URL = http://hl7.org/fhir/StructureDefinition/valueset-system
system: Allows a direct reference to the code system for FHIR query.


Use on Element ID ValueSet.compose.include.system
. . . extension I 0..0
. . . url 1..1 uri "http://hl7.org/fhir/StructureDefinition/valueset-system"
. . valueCanonical . value[x] 0..1 I 1..1 canonical ( 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 -->
 <

 <valueCanonical value="[canonical]"/><!-- ?? 1..1 Value of extension -->

</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! 
    "

    "valueCanonical" : "<canonical>" // C? R! Value of extension

  }

Summary

Name Flags Card. Type Description & Constraints doco
. . extension system 0..1 canonical ( CodeSystem ) URL = http://hl7.org/fhir/StructureDefinition/valueset-system
system: Allows a direct reference to the code system for FHIR query.


Use on Element ID ValueSet.compose.include.system

doco Documentation for this format

Full Structure

Name Flags Card. Type Description & Constraints doco
. . extension 0..1 Extension URL = http://hl7.org/fhir/StructureDefinition/valueset-system
system: Allows a direct reference to the code system for FHIR query.


Use on Element ID ValueSet.compose.include.system
. . . extension I 0..0
. . . url 1..1 uri "http://hl7.org/fhir/StructureDefinition/valueset-system"
. . valueCanonical . value[x] 0..1 I 1..1 canonical ( 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 -->
 <

 <valueCanonical value="[canonical]"/><!-- ?? 1..1 Value of extension -->

</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! 
    "

    "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 )