Extension: Characteristic Expression

FHIR Infrastructure Work Group

Maturity Level: 1

Trial Use

Use Context: Any

Official URL: `http://hl7.org/fhir/StructureDefinition/characteristicExpression`				Version: 5.0.0-snapshot3
draft as of 2013-12-05				Computable Name: CharacteristicExpression
Flags: Non-Modifier				OID: TBD

Context of Use: Use on Element ID Group

Definition

An expression that defines the criteria for group membership. This extension can only be used on a Group resource with a membership of definitional. When this expression is used, the Group resource cannot have any characteristic elements; this mechanism is exclusive with characteristics. The result of the expression SHALL be boolean-valued. The expression SHALL be parameterized with a %context variable that represents the subject being tested for membership. If evaluation of the expression results in true, the subject is considered a member of the group.

Summary

Name	Flags	Card.	Type	Description & Constraints
CharacteristicExpression		0..1	Expression	URL = http://hl7.org/fhir/StructureDefinition/characteristicExpression CharacteristicExpression: An expression that defines the criteria for group membership. This extension can only be used on a Group resource with a membership of definitional. When this expression is used, the Group resource cannot have any characteristic elements; this mechanism is exclusive with characteristics. The result of the expression SHALL be boolean-valued. The expression SHALL be parameterized with a %context variable that represents the subject being tested for membership. If evaluation of the expression results in true, the subject is considered a member of the group. Use on Element ID Group
Documentation for this format

Full Structure

Name	Card.	Type	Description & Constraints
extension	0..1	Extension	URL = http://hl7.org/fhir/StructureDefinition/characteristicExpression CharacteristicExpression: An expression that defines the criteria for group membership. This extension can only be used on a Group resource with a membership of definitional. When this expression is used, the Group resource cannot have any characteristic elements; this mechanism is exclusive with characteristics. The result of the expression SHALL be boolean-valued. The expression SHALL be parameterized with a %context variable that represents the subject being tested for membership. If evaluation of the expression results in true, the subject is considered a member of the group. Use on Element ID Group
extension	0..0
url	1..1	uri	"http://hl7.org/fhir/StructureDefinition/characteristicExpression"
value[x]	1..1	Expression	Value of extension
Documentation for this format

XML Template

<!-- CharacteristicExpression -->

<extension xmlns="http://hl7.org/fhir"
     url="http://hl7.org/fhir/StructureDefinition/characteristicExpression" >
  <!-- from Element: extension -->
 <valueExpression><!-- I 1..1 Expression Value of extension --></valueExpression>
</extension>

JSON Template

{ // CharacteristicExpression
  // from Element: extension
    "extension" : [ //  sliced by value:url  in the specified order, Open ]
  // extension: Extension: Prohibited
    "url" : "http://hl7.org/fhir/StructureDefinition/characteristicExpression", // R! 
    "valueExpression" : { Expression } // I R! Value of extension
  }

Summary

Name	Flags	Card.	Type	Description & Constraints
CharacteristicExpression		0..1	Expression	URL = http://hl7.org/fhir/StructureDefinition/characteristicExpression CharacteristicExpression: An expression that defines the criteria for group membership. This extension can only be used on a Group resource with a membership of definitional. When this expression is used, the Group resource cannot have any characteristic elements; this mechanism is exclusive with characteristics. The result of the expression SHALL be boolean-valued. The expression SHALL be parameterized with a %context variable that represents the subject being tested for membership. If evaluation of the expression results in true, the subject is considered a member of the group. Use on Element ID Group
Documentation for this format

Full Structure

Name	Card.	Type	Description & Constraints
extension	0..1	Extension	URL = http://hl7.org/fhir/StructureDefinition/characteristicExpression CharacteristicExpression: An expression that defines the criteria for group membership. This extension can only be used on a Group resource with a membership of definitional. When this expression is used, the Group resource cannot have any characteristic elements; this mechanism is exclusive with characteristics. The result of the expression SHALL be boolean-valued. The expression SHALL be parameterized with a %context variable that represents the subject being tested for membership. If evaluation of the expression results in true, the subject is considered a member of the group. Use on Element ID Group
extension	0..0
url	1..1	uri	"http://hl7.org/fhir/StructureDefinition/characteristicExpression"
value[x]	1..1	Expression	Value of extension
Documentation for this format

XML Template

<!-- CharacteristicExpression -->

<extension xmlns="http://hl7.org/fhir"
     url="http://hl7.org/fhir/StructureDefinition/characteristicExpression" >
  <!-- from Element: extension -->
 <valueExpression><!-- I 1..1 Expression Value of extension --></valueExpression>
</extension>

JSON Template

{ // CharacteristicExpression
  // from Element: extension
    "extension" : [ //  sliced by value:url  in the specified order, Open ]
  // extension: Extension: Prohibited
    "url" : "http://hl7.org/fhir/StructureDefinition/characteristicExpression", // R! 
    "valueExpression" : { Expression } // I R! Value of extension
  }

Constraints

ele-1: All FHIR elements must have a @value or children (xpath: hasValue() or (children().count() > id.count()))
ext-1: Must have either extensions or value[x], not both (xpath: extension.exists() != value.exists())
ele-1: On Extension.extension: All FHIR elements must have a @value or children (xpath on Extension.extension: hasValue() or (children().count() > id.count()))
ext-1: On Extension.extension: Must have either extensions or value[x], not both (xpath on Extension.extension: extension.exists() != value.exists())
ele-1: On Extension.value[x]: All FHIR elements must have a @value or children (xpath on Extension.value[x]: hasValue() or (children().count() > id.count()))

Search

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Examples of this extension

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