Release 5 Preview #1

This page is part of the FHIR Specification (v4.2.0: R5 Preview #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: selector

FHIR Infrastructure Work Group

Maturity Level: 1

Informative

Use Context: Any

URL for this extension:

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

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

A FHIRPath statement that defines whether an element is in the slice.

Comment:

This extension can only appear on element definitions that are part of a set of slices, and not on the slicing definition itself. If the selector appears in the presence of nominated slices discriminators, then the slicing defined by the discriminator(s) and the selector on each slice must agree. In the absence of any nominated discriminators, then an element is allowed to be in multiple slices.

Context of Use: Use on Element ID ElementDefinition

Summary

Name	Flags	Card.	Type	Description & Constraints
selector		0..1	string	URL = http://hl7.org/fhir/StructureDefinition/elementdefinition-selector selector: A FHIRPath statement that defines whether an element is in the slice. Use on Element ID ElementDefinition
Documentation for this format

Full Structure

Name	Flags	Card.	Type	Description & Constraints
extension		0..1	Extension	URL = http://hl7.org/fhir/StructureDefinition/elementdefinition-selector selector: A FHIRPath statement that defines whether an element is in the slice. Use on Element ID ElementDefinition
extension	I	0..0
url		1..1	uri	"http://hl7.org/fhir/StructureDefinition/elementdefinition-selector"
value[x]	I	1..1	string	Value of extension
Documentation for this format

XML Template

<!-- selector -->

<extension xmlns="http://hl7.org/fhir"
     url="http://hl7.org/fhir/StructureDefinition/elementdefinition-selector" >
  <!-- from Element: extension -->
 <valueString value="[string]"/><!--  1..1 Value of extension -->
</extension>

JSON Template

{ // selector
  // from Element: extension
    "extension" : [ //  sliced by value:url  in the specified order, Open ]
    "url" : "http://hl7.org/fhir/StructureDefinition/elementdefinition-selector", // R! 
    "valueString" : "<string>" // C? R! Value of extension
  }

Summary

Name	Flags	Card.	Type	Description & Constraints
selector		0..1	string	URL = http://hl7.org/fhir/StructureDefinition/elementdefinition-selector selector: A FHIRPath statement that defines whether an element is in the slice. Use on Element ID ElementDefinition
Documentation for this format

Full Structure

Name	Flags	Card.	Type	Description & Constraints
extension		0..1	Extension	URL = http://hl7.org/fhir/StructureDefinition/elementdefinition-selector selector: A FHIRPath statement that defines whether an element is in the slice. Use on Element ID ElementDefinition
extension	I	0..0
url		1..1	uri	"http://hl7.org/fhir/StructureDefinition/elementdefinition-selector"
value[x]	I	1..1	string	Value of extension
Documentation for this format

XML Template

<!-- selector -->

<extension xmlns="http://hl7.org/fhir"
     url="http://hl7.org/fhir/StructureDefinition/elementdefinition-selector" >
  <!-- from Element: extension -->
 <valueString value="[string]"/><!--  1..1 Value of extension -->
</extension>

JSON Template

{ // selector
  // from Element: extension
    "extension" : [ //  sliced by value:url  in the specified order, Open ]
    "url" : "http://hl7.org/fhir/StructureDefinition/elementdefinition-selector", // R! 
    "valueString" : "<string>" // 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)