FHIR Extensions Pack
5.3.0 - May 2026 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 5.3.0 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: XHTML Representation

Official URL: http://hl7.org/fhir/StructureDefinition/rendering-xhtml Version: 5.3.0
Standards status: Trial-use Maturity Level: 3 Computable Name: XhtmlRepresentation
Other Identifiers: OID:2.16.840.1.113883.4.642.5.1573

This is an equivalent of the string on which the extension is sent, but includes additional XHTML markup, such as bold, italics, styles, tables, etc. Existing restrictions on XHTML content apply. Note that using markdown allows for greater flexibility of display. Like the Resource Narrative, this extension may reference binary resources for image content (see note about referencing images).

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

Changes since version 5.2.0:

  • 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 with the type string: This is an equivalent of the string on which the extension is sent, but includes additional XHTML markup, such as bold, italics, styles, tables, etc. Existing restrictions on XHTML content apply. Note that using markdown allows for greater flexibility of display. Like the Resource Narrative, this extension may reference binary resources for image content (see note about referencing images).

    Maturity: 3

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension String equivalent with html markup
    ... extension 0..0 Extension
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/rendering-xhtml"
    ... value[x] C 1..1 string Value of extension
    Constraints: xhtml-ext-1

    doco Documentation for this format
    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension String equivalent with html markup
    ... 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/StructureDefinition/rendering-xhtml"

    doco Documentation for this format

    This structure is derived from Extension

    Summary

    Simple Extension with the type string: This is an equivalent of the string on which the extension is sent, but includes additional XHTML markup, such as bold, italics, styles, tables, etc. Existing restrictions on XHTML content apply. Note that using markdown allows for greater flexibility of display. Like the Resource Narrative, this extension may reference binary resources for image content (see note about referencing images).

    Maturity: 3

    Differential View

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension String equivalent with html markup
    ... extension 0..0 Extension
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/rendering-xhtml"
    ... value[x] C 1..1 string Value of extension
    Constraints: xhtml-ext-1

    doco Documentation for this format

    Snapshot View

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension String equivalent with html markup
    ... 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/StructureDefinition/rendering-xhtml"

    doco Documentation for this format

     

    Other representations of profile: CSV, Excel, Schematron

    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()
    xhtml-ext-1 error Extension.value[x] The XHTML contained here SHALL abide by the same constraints as narrative. I.e. contain only the basic html formatting elements and attributes described in chapters 7-11 (except section 4 of chapter 9) and 15 of the HTML 4.0 standard, <a> elements (either name or href), images and internally contained style attributes htmlChecks()

    R4B

    The extension is unchanged in R4B

    R4

    The extension is unchanged in R4

    R3

    The extension is unchanged in R3

    Search Parameters for this Extension

    (none found)