FHIR Extensions Pack
5.2.0-ballot - 5.2.0 Ballot - September 2024) International flag

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

Extension: Alternate Canonical

Official URL: http://hl7.org/fhir/StructureDefinition/alternate-canonical Version: 5.2.0-ballot
Standards status: Trial-use Maturity Level: 2 Computable Name: AlternateCanonical
Other Identifiers: OID:2.16.840.1.113883.4.642.5.1674

Used with inter-version extensions where the element being referenced by inter-version extension is of type ‘canonical’ and includes a reference to a resource whose canonical URL is different in the referencing version than it is in the FHIR version where the element was defined. E.g. if an R5 implementation were using inter-version extensions to support an element that referenced Bar, when in R7, the url would have been …/Foo. In this situation, the canonical element would have no value and would instead have an extension that referred to the canonical URL of the ‘../Bar’ resource (which would technically not be supported in R7, but is appropriate in R5).

Context of Use

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

  • Element ID canonical

Usage info

Usage:

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

Changes since version 1.0.0:

  • The resource metadata has changed (description)
  • The data elements list has changed
  • One or more text definitions, invariants or bindings have changed

    • Formal Views of Extension Content

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

    This structure is derived from Extension

    Summary

    Simple Extension of type canonical: Used with inter-version extensions where the element being referenced by inter-version extension is of type 'canonical' and includes a reference to a resource whose canonical URL is different in the referencing version than it is in the FHIR version where the element was defined. E.g. if an R5 implementation were using inter-version extensions to support an element that referenced Bar, when in R7, the url would have been .../Foo. In this situation, the canonical element would have no value and would instead have an extension that referred to the canonical URL of the '../Bar' resource (which would technically not be supported in R7, but is appropriate in R5).

    Maturity: 2

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraintsdoco
    .. Extension 0..1 Extension Alternative reference (target type is wrong)
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/alternate-canonical"
    ... value[x] 1..1 canonical(CanonicalResource) Value of extension

    doco Documentation for this format
    NameFlagsCard.TypeDescription & Constraintsdoco
    .. Extension 0..1 Extension Alternative reference (target type is wrong)
    ... id 0..1 id Unique id for inter-element referencing
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/alternate-canonical"

    doco Documentation for this format

    This structure is derived from Extension

    Summary

    Simple Extension of type canonical: Used with inter-version extensions where the element being referenced by inter-version extension is of type 'canonical' and includes a reference to a resource whose canonical URL is different in the referencing version than it is in the FHIR version where the element was defined. E.g. if an R5 implementation were using inter-version extensions to support an element that referenced Bar, when in R7, the url would have been .../Foo. In this situation, the canonical element would have no value and would instead have an extension that referred to the canonical URL of the '../Bar' resource (which would technically not be supported in R7, but is appropriate in R5).

    Maturity: 2

    Differential View

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraintsdoco
    .. Extension 0..1 Extension Alternative reference (target type is wrong)
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/alternate-canonical"
    ... value[x] 1..1 canonical(CanonicalResource) Value of extension

    doco Documentation for this format

    Snapshot View

    NameFlagsCard.TypeDescription & Constraintsdoco
    .. Extension 0..1 Extension Alternative reference (target type is wrong)
    ... id 0..1 id Unique id for inter-element referencing
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/alternate-canonical"

    doco Documentation for this format

     

    Other representations of profile: CSV, Excel, Schematron

    Constraints

    IdGradePath(s)DetailsRequirements
    ele-1error**ALL** elementsAll FHIR elements must have a @value or children
    : hasValue() or (children().count() > id.count())
    ext-1error**ALL** extensionsMust have either extensions or value[x], not both
    : extension.exists() != value.exists()

    Search Parameters for this Extension

    (none found)