FHIR Extensions Pack, published by HL7 International / FHIR Infrastructure. This guide is not an authorized publication; it is the continuous build for version 5.2.0-ballot built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/fhir-extensions/ and changes regularly. See the Directory of published versions

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Extension: Initial value

Official URL: http://hl7.org/fhir/StructureDefinition/cqf-initialValue				Version: 5.2.0-ballot
Standards status: Trial-use		Maturity Level: 3	Responsible: HL7 International / Clinical Decision Support	Computable Name: InitialValue
Other Identifiers: OID:2.16.840.1.113883.4.642.5.1698

An expression that determines an initial value for the element on which it appears. The expression may be simply the name of a expression in a referenced library, or it may be a complete inline expression.

This extension supports providing an expression that determines a calculated value for an element, but one that is only appropriate as the initial value (e.g. the calculated value that should be used when a form is first displayed to capture the information in the resource, as opposed to the cqf-calculatedValue extension, which provides the calculated value for an element whenever any change is made to the values of the resource).

Context of Use

This extension may be used on the following element(s)

• Element ID: Element

Usage info

Usages:

• This Extension is not used by any profiles in this Implementation Guide

Formal Views of Extension Content

Description of Profiles, Differentials, Snapshots, and how the XML and JSON presentations work.

 

Other representations of profile: CSV, Excel, Schematron

Constraints

Id	Grade	Path(s)	Details	Requirements
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both : extension.exists() != value.exists()

R4B

The extension is unchanged in R4B

R4

The extension is unchanged in R4

R3

The extension is represented a little differently in R3:

• Replace the type Expression with a set of extensions for the content of the type along with the _datatype extension
• Note: Extensions that have been modified for R3 are still draft while real-world experience is collected

Name	Flags	Card.	Type	Description & Constraints      Filter: Bindings Constraints Obligations
Extension		0..*	Extension	An initial value expression
Slices for extension		0 ..*	Extension	Extension Slice: Unordered, Open by value:url
extension:_datatype		1..1	(Complex)	DataType name 'Expression' from R5 URL: http://hl7.org/fhir/StructureDefinition/_datatype
value[x]		1.. 1	string	Value of extension Fixed Value: Expression
extension:description		0..1	Extension	Natural language description of the condition
extension		0 .. 0
url		1 .. 1	uri	"description"
value[x]		1.. 1	string	Value of extension
extension:name		0..1	Extension	Short name assigned to expression for reuse
extension		0 .. 0
url		1 .. 1	uri	"name"
value[x]		1.. 1	code	Value of extension
extension:language		0..1	Extension	text/cql | text/fhirpath | application/x-fhir-query | etc.
extension		0 .. 0
url		1 .. 1	uri	"language"
value[x]		1.. 1	code	Value of extension Binding: ExpressionLanguage ( extensible ) : The media type of the expression language. Additional Bindings Purpose MimeTypes Max Binding
extension:expression		0..1	Extension	Expression in specified language
extension		0 .. 0
url		1 .. 1	uri	"expression"
value[x]		1.. 1	string	Value of extension
extension:reference		0..1	Extension	Where the expression is found
extension		0 .. 0
url		1 .. 1	uri	"reference"
value[x]		1.. 1	uri	Value of extension
url		1 .. 1	uri	"http://hl7.org/fhir/StructureDefinition/cqf-initialValue"
value[x]		0 .. 0
Documentation for this format

Search Parameters for this Extension

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