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Extension: allowedUnits

URL for this extension:

http://hl7.org/fhir/StructureDefinition/elementdefinition-allowedUnits

Status: draft. Extension maintained by: Health Level Seven, Inc. - FHIR Core WG

Identifies the units of measure in which the element should be captured or expressed.

Comment:

Use a value set if more than one unit of measure is possible. Value sets will typically be short enough to display in a drop-down selection list.

Context of Use: Use on Element ID ElementDefinition

Extension Content

<!-- allowedUnits -->doco 
<extension xmlns="http://hl7.org/fhir"
 url="http://hl7.org/fhir/StructureDefinition/elementdefinition-allowedUnits" >
 <!-- from Element: extension -->
 <value[x]><!-- ?? 1..1 CodeableConcept|canonical  Value of extension  --></value[x]>
</extension>

{ // allowedUnits
 // from Element: extension
 "extension" : [ //  sliced by value:url in the specified order, Open ]
 "url" : "http://hl7.org/fhir/StructureDefinition/elementdefinition-allowedUnits", // R! 
// value[x]: Value of extension. One of these 2:
 "valueCodeableConcept" : { CodeableConcept  } // C? R! Value of extension 
 "valueCanonical" : "<canonical >", // C? R! Value of extension 
 }

<!-- allowedUnits -->doco 
<extension xmlns="http://hl7.org/fhir"
 url="http://hl7.org/fhir/StructureDefinition/elementdefinition-allowedUnits" >
 <!-- from Element: extension -->
 <value[x]><!-- ?? 1..1 CodeableConcept|canonical  Value of extension  --></value[x]>
</extension>

{ // allowedUnits
 // from Element: extension
 "extension" : [ //  sliced by value:url in the specified order, Open ]
 "url" : "http://hl7.org/fhir/StructureDefinition/elementdefinition-allowedUnits", // R! 
// value[x]: Value of extension. One of these 2:
 "valueCodeableConcept" : { CodeableConcept  } // C? R! Value of extension 
 "valueCanonical" : "<canonical >", // C? R! Value of extension 
 }

Constraints

• ele-1: All FHIR elements must have a @value or children unless an empty Parameters resource (xpath: @value|f:*|h:div|self::f:Parameters)
• 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)