FHIR Release 3 (STU) 4

This page is part of the FHIR Specification (v3.0.2: (v4.0.1: R4 - Mixed Normative and STU 3). ) in it's permanent home (it will always be available at this URL). 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 R4 R3 R2

Extension: nullFlavor

FHIR Infrastructure Work Group   Maturity Level : 1 Informative Use Context : Any

URL for this extension: 


http://hl7.org/fhir/StructureDefinition/iso21090-nullFlavor

Status: draft. Extension maintained by: Health Level Seven International (Modeling and Methodology)

If the value is not a proper value, indicates the reason.

Comment :

Considerable care must be used when using nullFlavor in this context of FHIR - more than any other concept, this is tied to the way v3 works, and FHIR is quite different. For instance, there is no notion of a "proper value" as opposed to any other value in FHIR. a NullFlavor should be understood to mean, "why information is missing", and the nulFlavors OTH, NINF, PINF, and TRC should not be used.

Context of Use: Use on data type: Any usage info: insert a list of places where this extension is used Element ID Element

Extension Content

Summary

Name Flags Card. Type Description & Constraints doco
. . extension nullFlavor 0..1 code URL = http://hl7.org/fhir/StructureDefinition/iso21090-nullFlavor
nullFlavor: If the value is not a proper value, indicates the reason.


Binding: v3 Code System NullFlavor ( required )
Use on data type: Any Element ID Element

doco Documentation for this format

Full Structure

Name Flags Card. Type Description & Constraints doco
. . extension 0..1 Extension URL = http://hl7.org/fhir/StructureDefinition/iso21090-nullFlavor
nullFlavor: If the value is not a proper value, indicates the reason.


Use on data type: Any Element ID Element
... extension I 0..0
. . . url 1..1 uri "http://hl7.org/fhir/StructureDefinition/iso21090-nullFlavor" "http://hl7.org/fhir/StructureDefinition/iso21090-nullFlavor"
. . valueCode . value[x] I 0..1 1..1 code Value of extension
Binding: v3 Code System NullFlavor ( required )

doco Documentation for this format

XML Template 

<!-- nullFlavor -->doco

<extension xmlns="http://hl7.org/fhir"
     url="http://hl7.org/fhir/StructureDefinition/iso21090-nullFlavor" >
  <!-- from Element: extension -->
 <

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

</extension>

JSON Template 

{ // nullFlavor
  // from Element: extension
    "
    ],

    "extension" : [ //  sliced by value:url  in the specified order, Open ]

    "url" : "http://hl7.org/fhir/StructureDefinition/iso21090-nullFlavor", // R! 
    "

    "valueCode" : "<code>" // C? R! Value of extension

  }

Summary

Name Flags Card. Type Description & Constraints doco
. . extension nullFlavor 0..1 code URL = http://hl7.org/fhir/StructureDefinition/iso21090-nullFlavor
nullFlavor: If the value is not a proper value, indicates the reason.


Binding: v3 Code System NullFlavor ( required )
Use on data type: Any Element ID Element

doco Documentation for this format

Full Structure

Name Flags Card. Type Description & Constraints doco
. . extension 0..1 Extension URL = http://hl7.org/fhir/StructureDefinition/iso21090-nullFlavor
nullFlavor: If the value is not a proper value, indicates the reason.


Use on data type: Any Element ID Element
... extension I 0..0
. . . url 1..1 uri "http://hl7.org/fhir/StructureDefinition/iso21090-nullFlavor" "http://hl7.org/fhir/StructureDefinition/iso21090-nullFlavor"
. . valueCode . value[x] I 0..1 1..1 code Value of extension
Binding: v3 Code System NullFlavor ( required )

doco Documentation for this format

XML Template 

<!-- nullFlavor -->doco

<extension xmlns="http://hl7.org/fhir"
     url="http://hl7.org/fhir/StructureDefinition/iso21090-nullFlavor" >
  <!-- from Element: extension -->
 <

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

</extension>

JSON Template 

{ // nullFlavor
  // from Element: extension
    "
    ],

    "extension" : [ //  sliced by value:url  in the specified order, Open ]

    "url" : "http://hl7.org/fhir/StructureDefinition/iso21090-nullFlavor", // R! 
    "

    "valueCode" : "<code>" // 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 )