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: String Format

Official URL: http://hl7.org/fhir/tools/StructureDefinition/elementdefinition-string-format Version: 1.1.0
Standards status: Informative Active as of 2026-03-04 Maturity Level: 3 Computable Name: StringFormat
Other Identifiers: OID:2.16.840.1.113883.4.642.40.1.42.70

The actual format of the string, to allow for additional validation. This usually arises due to layered content models. The format is the name of another primitive type

Context of Use

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

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..* Extension String format for the element
... extension 0..0 Extension
... url 1..1 uri "http://hl7.org/fhir/tools/StructureDefinition/elementdefinition-string-format"
... value[x] 1..1 code Value of extension
Binding: Primitive Types ValueSet (required)

doco Documentation for this format

Terminology Bindings (Differential)

Path Status Usage ValueSet Version Source
Extension.value[x] Base required Primitive Types ValueSet 📦1.1.0 This IG
NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
.. Extension 0..* Extension String format for the element
... 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/elementdefinition-string-format"

doco Documentation for this format

Terminology Bindings

Path Status Usage ValueSet Version Source
Extension.value[x] Base required Primitive Types ValueSet 📦1.1.0 This IG

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 code: The actual format of the string, to allow for additional validation. This usually arises due to layered content models. The format is the name of another primitive type

Maturity: 3

Differential ViewDifferential View

NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
.. Extension 0..* Extension String format for the element
... extension 0..0 Extension
... url 1..1 uri "http://hl7.org/fhir/tools/StructureDefinition/elementdefinition-string-format"
... value[x] 1..1 code Value of extension
Binding: Primitive Types ValueSet (required)

doco Documentation for this format

Terminology Bindings (Differential)

Path Status Usage ValueSet Version Source
Extension.value[x] Base required Primitive Types ValueSet 📦1.1.0 This IG

Snapshot View

NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
.. Extension 0..* Extension String format for the element
... 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/elementdefinition-string-format"

doco Documentation for this format

Terminology Bindings

Path Status Usage ValueSet Version Source
Extension.value[x] Base required Primitive Types ValueSet 📦1.1.0 This IG

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 code: The actual format of the string, to allow for additional validation. This usually arises due to layered content models. The format is the name of another primitive type

Maturity: 3

 

Other representations of profile: CSV, Excel, Schematron