FHIR Tooling Extensions IG
1.1.0 - Release 0.2.0 International flag

FHIR Tooling Extensions IG, published by HL7 International / FHIR Infrastructure. This guide is not an authorized publication; it is the continuous build for version 1.1.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/FHIR/fhir-tools-ig/ and changes regularly. See the Directory of published versions

Extension: Logical Target (Experimental)

Official URL: http://hl7.org/fhir/tools/StructureDefinition/logical-target Version: 1.1.0
Standards status: Informative Active as of 2026-03-04 Maturity Level: 2 Computable Name: LogicalTarget
Other Identifiers: OID:2.16.840.1.113883.4.642.40.1.42.32

This extension is used logical models to indicate that this type can be the target of a reference. This indicates that there is a persistence identity and maintenance lifecycle for the type, though there are no requirements for how those are defined.

Context of Use

Usage info

Usages:

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

You can also check for usages in the FHIR IG Statistics

Formal Views of Extension Content

Description Differentials, Snapshots, and other representations.

NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
.. Extension 0..1 Extension logical-target
... extension 0..0 Extension
... url 1..1 uri "http://hl7.org/fhir/tools/StructureDefinition/logical-target"
... value[x] 1..1 boolean Value of extension

doco Documentation for this format
NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
.. Extension 0..1 Extension logical-target
... id 0..1 id Unique id for inter-element referencing
... extension 0..0 Extension
Slice: Unordered, Open by value:url
... url 1..1 uri "http://hl7.org/fhir/tools/StructureDefinition/logical-target"

doco Documentation for this format

Constraints

Id Grade Path(s) Description Expression
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()

Summary

Simple Extension with the type boolean: This extension is used logical models to indicate that this type can be the target of a reference. This indicates that there is a persistence identity and maintenance lifecycle for the type, though there are no requirements for how those are defined.

Maturity: 2

Differential ViewDifferential View

NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
.. Extension 0..1 Extension logical-target
... extension 0..0 Extension
... url 1..1 uri "http://hl7.org/fhir/tools/StructureDefinition/logical-target"
... value[x] 1..1 boolean Value of extension

doco Documentation for this format

Snapshot View

NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
.. Extension 0..1 Extension logical-target
... id 0..1 id Unique id for inter-element referencing
... extension 0..0 Extension
Slice: Unordered, Open by value:url
... url 1..1 uri "http://hl7.org/fhir/tools/StructureDefinition/logical-target"

doco Documentation for this format

Constraints

Id Grade Path(s) Description Expression
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()

Summary

Simple Extension with the type boolean: This extension is used logical models to indicate that this type can be the target of a reference. This indicates that there is a persistence identity and maintenance lifecycle for the type, though there are no requirements for how those are defined.

Maturity: 2

 

Other representations of profile: CSV, Excel, Schematron