R3-Composition-element-map-to-R4B
type: ConceptMap
node role: treeRoot
id:
  v: R3-Composition-element-map-to-R4B
text:
  status:
    v: generated
  div:
    v: Generated Narrative: ConceptMap R3-Composition-element-map-to-R4B Mapping from http://hl7.org/fhir/3.0 to http://hl7.org/fhir/4.3 Group 1 Mapping from http://hl7.org/fhir/StructureDefinition/Composition|3.0.2 to Compositionversion: 4.3.0) Source Code Relationship Target Code Comment Composition.meta (meta) maps to wider concept Composition.meta Element `Composition.meta` is mapped to FHIR R4B element `Composition.meta` as `SourceIsBroaderThanTarget`. The mappings for `Composition.meta` do not cover the following types: Meta. The mappings for `Composition.meta` do not cover the following types based on type expansion: lastUpdated, profile, security, tag, versionId. Composition.implicitRules (implicitRules) is equivalent to Composition.implicitRules Element `Composition.implicitRules` is mapped to FHIR R4B element `Composition.implicitRules` as `Equivalent`. Asserting this rule set restricts the content to be only understood by a limited set of trading partners. This inherently limits the usefulness of the data in the long term. However, the existing health eco-system is highly fractured, and not yet ready to define, collect, and exchange data in a generally computable sense. Wherever possible, implementers and/or specification writers should avoid using this element. This element is labelled as a modifier because the implicit rules may provide additional knowledge about the resource that modifies it's meaning or interpretation. Composition.language (language) is equivalent to Composition.language Element `Composition.language` is mapped to FHIR R4B element `Composition.language` as `Equivalent`. Language is provided to support indexing and accessibility (typically, services such as text to speech use the language tag). The html language tag in the narrative applies to the narrative. The language tag on the resource may be used to specify the language of other presentations generated from the data in the resource Not all the content has to be in the base language. The…
extension:
  url:
    v: http://hl7.org/fhir/StructureDefinition/structuredefinition-wg
    l: structuredefinition-wg
  value: Code
    v: fhir
extension:
  url:
    v: http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm
    l: structuredefinition-fmm
  value: Integer
    v: 0
    extension:
      url:
        v: http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom
        l: structuredefinition-conformance-derivedFrom
      value: Canonical
        v: http://hl7.org/fhir/uv/xver/ImplementationGuide/hl7.fhir.uv.xver-r3.r4b
        l: hl7.fhir.uv.xver-r3.r4b
extension:
  url:
    v: http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status
    l: structuredefinition-standards-status
  value: Code
    v: trial-use
    extension:
      url:
        v: http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom
        l: structuredefinition-conformance-derivedFrom
      value: Canonical
        v: http://hl7.org/fhir/uv/xver/ImplementationGuide/hl7.fhir.uv.xver-r3.r4b
        l: hl7.fhir.uv.xver-r3.r4b
url:
  v: http://hl7.org/fhir/uv/xver/ConceptMap/R3-Composition-element-map-to-R4B
  l: R3-Composition-element-map-to-R4B
version:
  v: 0.1.0
name:
  v: R3CompositionElementMapToR4B
title:
  v: Cross-version mapping for FHIR STU3 Composition to FHIR R4B Composition
status:
  v: active
experimental:
  v: false
date:
  v: 2026-03-17T16:04:10.503567-05:00
contact:
  name:
    v: FHIR Infrastructure
  telecom:
    system:
      v: url
    value:
      v: http://www.hl7.org/Special/committees/fiwg
description:
  v: This ConceptMap represents cross-version mappings for elements from a FHIR STU3 Composition to FHIR R4B.
jurisdiction:
  coding:
    system:
      v: http://unstats.un.org/unsd/methods/m49/m49.htm
      l: m49.htm
    code:
      v: 001
    display:
      v: World
source: Canonical
  v: http://hl7.org/fhir/3.0
  l: http://hl7.org/fhir/3.0
target: Uri
  v: http://hl7.org/fhir/4.3
  l: http://hl7.org/fhir/4.3
group:
  source:
    v: http://hl7.org/fhir/StructureDefinition/Composition
    l: Composition
  source version:
    v: 3.0.2
  target:
    v: http://hl7.org/fhir/StructureDefinition/Composition
    l: Composition
  target version:
    v: 4.3.0
  element:
    code:
      v: Composition.meta
    display:
      v: meta
    target:
      modifier extension:
        value: Code
      code:
        v: Composition.meta
      display:
        v: Composition.meta
      equivalence:
        v: wider
      comment:
        v: Element `Composition.meta` is mapped to FHIR R4B element `Composition.meta` as `SourceIsBroaderThanTarget`. The mappings for `Composition.meta` do not cover the following types: Meta. The mappings for `Composition.meta` do not cover the following types based on type expansion: lastUpdated, profile, security, tag, versionId.
  element:
    code:
      v: Composition.implicitRules
    display:
      v: implicitRules
    target:
      modifier extension:
        value: Code
      code:
        v: Composition.implicitRules
      display:
        v: Composition.implicitRules
      equivalence:
        v: equivalent
      comment:
        v: Element `Composition.implicitRules` is mapped to FHIR R4B element `Composition.implicitRules` as `Equivalent`. Asserting this rule set restricts the content to be only understood by a limited set of trading partners. This inherently limits the usefulness of the data in the long term. However, the existing health eco-system is highly fractured, and not yet ready to define, collect, and exchange data in a generally computable sense. Wherever possible, implementers and/or specification writers should avoid using this element. This element is labelled as a modifier because the implicit rules may provide additional knowledge about the resource that modifies it's meaning or interpretation.
  element:
    code:
      v: Composition.language
    display:
      v: language
    target:
      modifier extension:
        value: Code
      code:
        v: Composition.language
      display:
        v: Composition.language
      equivalence:
        v: equivalent
      comment:
        v: Element `Composition.language` is mapped to FHIR R4B element `Composition.language` as `Equivalent`. Language is provided to support indexing and accessibility (typically, services such as text to speech use the language tag). The html language tag in the narrative applies to the narrative. The language tag on the resource may be used to specify the language of other presentations generated from the data in the resource Not all the content has to be in the base language. The Resource.language should not be assumed to apply to the narrative automatically. If a language is specified, it should it also be specified on the div element in the html (see rules in HTML5 for information about the relationship between xml:lang and the html lang attribute).
  element:
    code:
      v: Composition.text
    display:
      v: text
    target:
      modifier extension:
        value: Code
      code:
        v: Composition.text
      display:
        v: Composition.text
      equivalence:
        v: wider
      comment:
        v: Element `Composition.text` is mapped to FHIR R4B element `Composition.text` as `SourceIsBroaderThanTarget`. The mappings for `Composition.text` do not cover the following types: Narrative. The mappings for `Composition.text` do not cover the following types based on type expansion: div, status. Contained resources do not have narrative. Resources that are not contained SHOULD have a narrative. In some cases, a resource may only have text with little or no additional discrete data (as long as all minOccurs=1 elements are satisfied). This may be necessary for data from legacy systems where information is captured as a "text blob" or where text is additionally entered raw or narrated and encoded in formation is added later.
  element:
    code:
      v: Composition.contained
    display:
      v: contained
    target:
      modifier extension:
        value: Code
      code:
        v: Composition.contained
      display:
        v: Composition.contained
      equivalence:
        v: equivalent
      comment:
        v: Element `Composition.contained` is mapped to FHIR R4B element `Composition.contained` as `SourceIsBroaderThanTarget`. This should never be done when the content can be identified properly, as once identification is lost, it is extremely difficult (and context dependent) to restore it again.
  element:
    code:
      v: Composition.identifier
    display:
      v: identifier
    target:
      modifier extension:
        value: Code
      code:
        v: Composition.identifier
      display:
        v: Composition.identifier
      equivalence:
        v: wider
      comment:
        v: Element `Composition.identifier` is mapped to FHIR R4B element `Composition.identifier` as `SourceIsBroaderThanTarget`. The mappings for `Composition.identifier` do not cover the following types: Identifier. The mappings for `Composition.identifier` do not cover the following types based on type expansion: assigner, period, system, type, use, value. See discussion in resource definition for how these relate.
  element:
    code:
      v: Composition.status
    display:
      v: status
    target:
      modifier extension:
        value: Code
      code:
        v: Composition.status
      display:
        v: Composition.status
      equivalence:
        v: equivalent
      comment:
        v: Element `Composition.status` is mapped to FHIR R4B element `Composition.status` as `Equivalent`. If a composition is marked as withdrawn, the compositions/documents in the series, or data from the composition or document series, should never be displayed to a user without being clearly marked as untrustworthy. The flag "entered-in-error" is why this element is labeled as a modifier of other elements. Some reporting work flows require that the original narrative of a final document never be altered; instead, only new narrative can be added. The composition resource has no explicit status for explicitly noting whether this business rule is in effect. This would be handled by an extension if required.

Code
v: wider

Code
v: equivalent

Code
v: equivalent

Code
v: wider

Code
v: equivalent

Code
v: wider

Code
v: equivalent

code:
  v: Composition.type
display:
  v: type
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: equivalent
  code:
    v: Composition.type
  display:
    v: Composition.type
  equivalence:
    v: equivalent
  comment:
    v: Element `Composition.type` is mapped to FHIR R4B element `Composition.type` as `Equivalent`. For Composition type, LOINC is ubiquitous and strongly endorsed by HL7. Most implementation guides will require a specific LOINC code, or use LOINC as an extensible binding.

code:
  v: Composition.class
display:
  v: class
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: narrower
  code:
    v: Composition.category
  display:
    v: Composition.category
  equivalence:
    v: narrower
  comment:
    v: Element `Composition.class` is mapped to FHIR R4B element `Composition.category` as `SourceIsNarrowerThanTarget`. This is a metadata field from [XDS/MHD](http://wiki.ihe.net/index.php?title=Mobile_access_to_Health_Documents_(MHD)).

code:
  v: Composition.subject
display:
  v: subject
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: wider
  code:
    v: Composition.subject
  display:
    v: Composition.subject
  equivalence:
    v: wider
  comment:
    v: Element `Composition.subject` is mapped to FHIR R4B element `Composition.subject` as `SourceIsBroaderThanTarget`. The mappings for `Composition.subject` do not cover the following types based on type expansion: display, identifier, reference. The standard extension `alternate-reference` has been mapped as the representation of FHIR STU3 element `Composition.subject` with unmapped reference targets: Resource. For clinical documents, this is usually the patient.

code:
  v: Composition.encounter
display:
  v: encounter
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: wider
  code:
    v: Composition.encounter
  display:
    v: Composition.encounter
  equivalence:
    v: wider
  comment:
    v: Element `Composition.encounter` is mapped to FHIR R4B element `Composition.encounter` as `SourceIsBroaderThanTarget`. The mappings for `Composition.encounter` do not cover the following types based on type expansion: display, identifier, reference. The standard extension `alternate-reference` has been mapped as the representation of FHIR STU3 element `Composition.encounter` with unmapped reference targets: Encounter.

code:
  v: Composition.date
display:
  v: date
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: equivalent
  code:
    v: Composition.date
  display:
    v: Composition.date
  equivalence:
    v: equivalent
  comment:
    v: Element `Composition.date` is mapped to FHIR R4B element `Composition.date` as `Equivalent`. The Last Modified Date on the composition may be after the date of the document was attested without being changed.

code:
  v: Composition.author
display:
  v: author
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: wider
  code:
    v: Composition.author
  display:
    v: Composition.author
  equivalence:
    v: wider
  comment:
    v: Element `Composition.author` is mapped to FHIR R4B element `Composition.author` as `SourceIsBroaderThanTarget`. The standard extension `alternate-reference` has been mapped as the representation of FHIR STU3 element `Composition.author` with unmapped reference targets: Device, Patient, Practitioner, RelatedPerson.

code:
  v: Composition.title
display:
  v: title
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: equivalent
  code:
    v: Composition.title
  display:
    v: Composition.title
  equivalence:
    v: equivalent
  comment:
    v: Element `Composition.title` is mapped to FHIR R4B element `Composition.title` as `Equivalent`. For many compositions, the title is the same as the text or a display name of Composition.type (e.g. a "consultation" or "progress note"). Note that CDA does not make title mandatory, but there are no known cases where it is useful for title to be omitted, so it is mandatory here. Feedback on this requirement is welcome during the trial use period.

code:
  v: Composition.confidentiality
display:
  v: confidentiality
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: equivalent
  code:
    v: Composition.confidentiality
  display:
    v: Composition.confidentiality
  equivalence:
    v: equivalent
  comment:
    v: Element `Composition.confidentiality` is mapped to FHIR R4B element `Composition.confidentiality` as `Equivalent`. The exact use of this element, and enforcement and issues related to highly sensitive documents are out of scope for the base specification, and delegated to implementation profiles (see security section). This element is labeled as a modifier because highly confidential documents must not be treated as if they are not.

code:
  v: Composition.attester
display:
  v: attester
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: wider
  code:
    v: Composition.attester
  display:
    v: Composition.attester
  equivalence:
    v: wider
  comment:
    v: Element `Composition.attester` is mapped to FHIR R4B element `Composition.attester` as `Equivalent`. Only list each attester once.

code:
  v: Composition.attester.mode
display:
  v: mode
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: equivalent
  code:
    v: Composition.attester.mode
  display:
    v: Composition.attester.mode
  equivalence:
    v: equivalent
  comment:
    v: Element `Composition.attester.mode` is mapped to FHIR R4B element `Composition.attester.mode` as `SourceIsBroaderThanTarget`. Use more than one code where a single attester has more than one mode (professional and legal are often paired).

code:
  v: Composition.attester.time
display:
  v: time
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: equivalent
  code:
    v: Composition.attester.time
  display:
    v: Composition.attester.time
  equivalence:
    v: equivalent
  comment:
    v: Element `Composition.attester.time` is mapped to FHIR R4B element `Composition.attester.time` as `Equivalent`.

code:
  v: Composition.attester.party
display:
  v: party
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: wider
  code:
    v: Composition.attester.party
  display:
    v: Composition.attester.party
  equivalence:
    v: wider
  comment:
    v: Element `Composition.attester.party` is mapped to FHIR R4B element `Composition.attester.party` as `SourceIsBroaderThanTarget`. The standard extension `alternate-reference` has been mapped as the representation of FHIR STU3 element `Composition.attester.party` with unmapped reference targets: Organization, Patient, Practitioner.

code:
  v: Composition.custodian
display:
  v: custodian
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: wider
  code:
    v: Composition.custodian
  display:
    v: Composition.custodian
  equivalence:
    v: wider
  comment:
    v: Element `Composition.custodian` is mapped to FHIR R4B element `Composition.custodian` as `SourceIsBroaderThanTarget`. The mappings for `Composition.custodian` do not cover the following types based on type expansion: display, identifier, reference. The standard extension `alternate-reference` has been mapped as the representation of FHIR STU3 element `Composition.custodian` with unmapped reference targets: Organization. This is useful when documents are derived from a composition - provides guidance for how to get the latest version of the document. This is optional because this is sometimes not known by the authoring system, and can be inferred by context. However, it is important that this information be known when working with a derived document, so providing a custodian is encouraged.

code:
  v: Composition.relatesTo
display:
  v: relatesTo
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: wider
  code:
    v: Composition.relatesTo
  display:
    v: Composition.relatesTo
  equivalence:
    v: wider
  comment:
    v: Element `Composition.relatesTo` is mapped to FHIR R4B element `Composition.relatesTo` as `Equivalent`. A document is a version specific composition.

code:
  v: Composition.relatesTo.code
display:
  v: code
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: equivalent
  code:
    v: Composition.relatesTo.code
  display:
    v: Composition.relatesTo.code
  equivalence:
    v: equivalent
  comment:
    v: Element `Composition.relatesTo.code` is mapped to FHIR R4B element `Composition.relatesTo.code` as `Equivalent`. If this document appends another document, then the document cannot be fully understood without also accessing the referenced document.

code:
  v: Composition.relatesTo.target[x]
display:
  v: target[x]
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: wider
  code:
    v: Composition.relatesTo.target[x]
  display:
    v: Composition.relatesTo.target[x]
  equivalence:
    v: wider
  comment:
    v: Element `Composition.relatesTo.target[x]` is mapped to FHIR R4B element `Composition.relatesTo.target[x]` as `SourceIsBroaderThanTarget`. The mappings for `Composition.relatesTo.target[x]` do not cover the following types: Identifier. The mappings for `Composition.relatesTo.target[x]` do not cover the following types based on type expansion: display, period, reference, system, type, use, value. The target context `Composition.relatesTo.target[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `Composition.relatesTo`. The standard extension `alternate-reference` has been mapped as PART of the representation of FHIR STU3 element `Composition.relatesTo.target[x]` with unmapped reference targets: Composition. Source element `Composition.relatesTo.target[x]` has unmapped reference types. While the target element `Composition.relatesTo.target[x]` is a choice type and does not allow extensions, the `alternate-reference` extension can be applied to Reference values within it.

code:
  v: Composition.event
display:
  v: event
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: wider
  code:
    v: Composition.event
  display:
    v: Composition.event
  equivalence:
    v: wider
  comment:
    v: Element `Composition.event` is mapped to FHIR R4B element `Composition.event` as `Equivalent`. The event needs to be consistent with the type element, though can provide further information if desired.

code:
  v: Composition.event.code
display:
  v: code
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: equivalent
  code:
    v: Composition.event.code
  display:
    v: Composition.event.code
  equivalence:
    v: equivalent
  comment:
    v: Element `Composition.event.code` is mapped to FHIR R4B element `Composition.event.code` as `Equivalent`. An event can further specialize the act inherent in the typeCode, such as where it is simply "Procedure Report" and the procedure was a "colonoscopy". If one or more eventCodes are included, they SHALL NOT conflict with the values inherent in the classCode, practiceSettingCode or typeCode, as such a conflict would create an ambiguous situation. This short list of codes is provided to be used as key words for certain types of queries.

code:
  v: Composition.event.period
display:
  v: period
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: wider
  code:
    v: Composition.event.period
  display:
    v: Composition.event.period
  equivalence:
    v: wider
  comment:
    v: Element `Composition.event.period` is mapped to FHIR R4B element `Composition.event.period` as `SourceIsBroaderThanTarget`. The mappings for `Composition.event.period` do not cover the following types: Period. The mappings for `Composition.event.period` do not cover the following types based on type expansion: end, start.

code:
  v: Composition.event.detail
display:
  v: detail
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: wider
  code:
    v: Composition.event.detail
  display:
    v: Composition.event.detail
  equivalence:
    v: wider
  comment:
    v: Element `Composition.event.detail` is mapped to FHIR R4B element `Composition.event.detail` as `SourceIsBroaderThanTarget`. The mappings for `Composition.event.detail` do not cover the following types based on type expansion: display, identifier, reference. The standard extension `alternate-reference` has been mapped as the representation of FHIR STU3 element `Composition.event.detail` with unmapped reference targets: Resource.

code:
  v: Composition.section
display:
  v: section
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: wider
  code:
    v: Composition.section
  display:
    v: Composition.section
  equivalence:
    v: wider
  comment:
    v: Element `Composition.section` is mapped to FHIR R4B element `Composition.section` as `Equivalent`.

code:
  v: Composition.section.title
display:
  v: title
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: equivalent
  code:
    v: Composition.section.title
  display:
    v: Composition.section.title
  equivalence:
    v: equivalent
  comment:
    v: Element `Composition.section.title` is mapped to FHIR R4B element `Composition.section.title` as `Equivalent`. The title identifies the section for a human reader. The title must be consistent with the narrative of the resource that is the target of the section.content reference. Generally, sections SHOULD have titles, but in some documents, it is unnecessary or inappropriate. Typically, this is where a section has subsections that have their own adequately distinguishing title, or documents that only have a single section. Most Implementation Guides will make section title to be a required element.

code:
  v: Composition.section.code
display:
  v: code
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: equivalent
  code:
    v: Composition.section.code
  display:
    v: Composition.section.code
  equivalence:
    v: equivalent
  comment:
    v: Element `Composition.section.code` is mapped to FHIR R4B element `Composition.section.code` as `Equivalent`. The code identifies the section for an automated processor of the document. This is particularly relevant when using profiles to control the structure of the document. If the section has content (instead of sub-sections), the section.code does not change the meaning or interpretation of the resource that is the content of the section in the comments for the section.code.

code:
  v: Composition.section.text
display:
  v: text
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: wider
  code:
    v: Composition.section.text
  display:
    v: Composition.section.text
  equivalence:
    v: wider
  comment:
    v: Element `Composition.section.text` is mapped to FHIR R4B element `Composition.section.text` as `SourceIsBroaderThanTarget`. The mappings for `Composition.section.text` do not cover the following types: Narrative. The mappings for `Composition.section.text` do not cover the following types based on type expansion: div, status. Document profiles may define what content should be represented in the narrative to ensure clinical safety.

code:
  v: Composition.section.mode
display:
  v: mode
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: equivalent
  code:
    v: Composition.section.mode
  display:
    v: Composition.section.mode
  equivalence:
    v: equivalent
  comment:
    v: Element `Composition.section.mode` is mapped to FHIR R4B element `Composition.section.mode` as `Equivalent`. This element is labeled as a modifier because a change list must not be mis-understood as a complete list.

code:
  v: Composition.section.orderedBy
display:
  v: orderedBy
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: equivalent
  code:
    v: Composition.section.orderedBy
  display:
    v: Composition.section.orderedBy
  equivalence:
    v: equivalent
  comment:
    v: Element `Composition.section.orderedBy` is mapped to FHIR R4B element `Composition.section.orderedBy` as `Equivalent`. Applications SHOULD render ordered lists in the order provided, but MAY allow users to re-order based on their own preferences as well. If there is no order specified, the order is unknown, though there may still be some order.

code:
  v: Composition.section.entry
display:
  v: entry
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: wider
  code:
    v: Composition.section.entry
  display:
    v: Composition.section.entry
  equivalence:
    v: wider
  comment:
    v: Element `Composition.section.entry` is mapped to FHIR R4B element `Composition.section.entry` as `SourceIsBroaderThanTarget`. The mappings for `Composition.section.entry` do not cover the following types based on type expansion: display, identifier, reference. The standard extension `alternate-reference` has been mapped as the representation of FHIR STU3 element `Composition.section.entry` with unmapped reference targets: Resource. If there are no entries in the list, an emptyReason SHOULD be provided.

code:
  v: Composition.section.emptyReason
display:
  v: emptyReason
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: equivalent
  code:
    v: Composition.section.emptyReason
  display:
    v: Composition.section.emptyReason
  equivalence:
    v: equivalent
  comment:
    v: Element `Composition.section.emptyReason` is mapped to FHIR R4B element `Composition.section.emptyReason` as `Equivalent`. The various reasons for an empty section make a significant interpretation to its interpretation. Note that this code is for use when the entire section content has been suppressed, and not for when individual items are omitted - implementers may consider using a text note or a flag on an entry in these cases.

code:
  v: Composition.section.section
display:
  v: section
target:
  modifier extension:
    url:
      v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
      l: extension-ConceptMap.element.target.equivalence
    value: Code
      v: equivalent
  code:
    v: Composition.section.section
  display:
    v: Composition.section.section
  equivalence:
    v: equivalent
  comment:
    v: Element `Composition.section.section` is mapped to FHIR R4B element `Composition.section.section` as `Equivalent`. Nested sections are primarily used to help human readers navigate to particular portions of the document.

source:
  v: http://hl7.org/fhir/StructureDefinition/Composition
  l: Composition
source version:
  v: 3.0.2
target:
  v: http://hl7.org/fhir/3.0/StructureDefinition/extension-Composition.meta
  l: extension-Composition.meta
target version:
  v: 0.1.0
element:
  code:
    v: Composition.meta
  display:
    v: meta
  target:
    modifier extension:
      url:
        v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
        l: extension-ConceptMap.element.target.equivalence
      value: Code
        v: equivalent
    code:
      v: Extension
    equivalence:
      v: equivalent
    comment:
      v: Element `Composition.meta` is mapped to FHIR R4B element `Composition.meta` as `SourceIsBroaderThanTarget`. The mappings for `Composition.meta` do not cover the following types: Meta. The mappings for `Composition.meta` do not cover the following types based on type expansion: lastUpdated, profile, security, tag, versionId.

source:
  v: http://hl7.org/fhir/StructureDefinition/Composition
  l: Composition
source version:
  v: 3.0.2
target:
  v: http://hl7.org/fhir/3.0/StructureDefinition/extension-Composition.text
  l: extension-Composition.text
target version:
  v: 0.1.0
element:
  code:
    v: Composition.text
  display:
    v: text
  target:
    modifier extension:
      url:
        v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
        l: extension-ConceptMap.element.target.equivalence
      value: Code
        v: equivalent
    code:
      v: Extension
    equivalence:
      v: equivalent
    comment:
      v: Element `Composition.text` is mapped to FHIR R4B element `Composition.text` as `SourceIsBroaderThanTarget`. The mappings for `Composition.text` do not cover the following types: Narrative. The mappings for `Composition.text` do not cover the following types based on type expansion: div, status. Contained resources do not have narrative. Resources that are not contained SHOULD have a narrative. In some cases, a resource may only have text with little or no additional discrete data (as long as all minOccurs=1 elements are satisfied). This may be necessary for data from legacy systems where information is captured as a "text blob" or where text is additionally entered raw or narrated and encoded in formation is added later.

source:
  v: http://hl7.org/fhir/StructureDefinition/Composition
  l: Composition
source version:
  v: 3.0.2
target:
  v: http://hl7.org/fhir/3.0/StructureDefinition/extension-Composition.identifier
  l: extension-Composition.identifier
target version:
  v: 0.1.0
element:
  code:
    v: Composition.identifier
  display:
    v: identifier
  target:
    modifier extension:
      url:
        v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
        l: extension-ConceptMap.element.target.equivalence
      value: Code
        v: equivalent
    code:
      v: Extension
    equivalence:
      v: equivalent
    comment:
      v: Element `Composition.identifier` is mapped to FHIR R4B element `Composition.identifier` as `SourceIsBroaderThanTarget`. The mappings for `Composition.identifier` do not cover the following types: Identifier. The mappings for `Composition.identifier` do not cover the following types based on type expansion: assigner, period, system, type, use, value. See discussion in resource definition for how these relate.

source:
  v: http://hl7.org/fhir/StructureDefinition/Composition
  l: Composition
source version:
  v: 3.0.2
target:
  v: http://hl7.org/fhir/3.0/StructureDefinition/extension-Composition.relatesTo.target
  l: extension-Composition.relatesTo.target
target version:
  v: 0.1.0
element:
  code:
    v: Composition.relatesTo.target[x]
  display:
    v: target[x]
  target:
    modifier extension:
      url:
        v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
        l: extension-ConceptMap.element.target.equivalence
      value: Code
        v: equivalent
    code:
      v: Extension
    equivalence:
      v: equivalent
    comment:
      v: Element `Composition.relatesTo.target[x]` is mapped to FHIR R4B element `Composition.relatesTo.target[x]` as `SourceIsBroaderThanTarget`. The mappings for `Composition.relatesTo.target[x]` do not cover the following types: Identifier. The mappings for `Composition.relatesTo.target[x]` do not cover the following types based on type expansion: display, period, reference, system, type, use, value. The target context `Composition.relatesTo.target[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `Composition.relatesTo`. The standard extension `alternate-reference` has been mapped as PART of the representation of FHIR STU3 element `Composition.relatesTo.target[x]` with unmapped reference targets: Composition. Source element `Composition.relatesTo.target[x]` has unmapped reference types. While the target element `Composition.relatesTo.target[x]` is a choice type and does not allow extensions, the `alternate-reference` extension can be applied to Reference values within it.

source:
  v: http://hl7.org/fhir/StructureDefinition/Composition
  l: Composition
source version:
  v: 3.0.2
target:
  v: http://hl7.org/fhir/StructureDefinition/alternate-reference
  l: alternate-reference
target version:
  v: 5.2.0
element:
  code:
    v: Composition.relatesTo.target[x]
  display:
    v: target[x]
  target:
    modifier extension:
      url:
        v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
        l: extension-ConceptMap.element.target.equivalence
      value: Code
        v: equivalent
    code:
      v: Extension
    equivalence:
      v: equivalent
    comment:
      v: Element `Composition.relatesTo.target[x]` is mapped to FHIR R4B element `Composition.relatesTo.target[x]` as `SourceIsBroaderThanTarget`. The mappings for `Composition.relatesTo.target[x]` do not cover the following types: Identifier. The mappings for `Composition.relatesTo.target[x]` do not cover the following types based on type expansion: display, period, reference, system, type, use, value. The target context `Composition.relatesTo.target[x]` is a choice-type element and cannot directly hold extensions. The context is moved up to parent element `Composition.relatesTo`. The standard extension `alternate-reference` has been mapped as PART of the representation of FHIR STU3 element `Composition.relatesTo.target[x]` with unmapped reference targets: Composition. Source element `Composition.relatesTo.target[x]` has unmapped reference types. While the target element `Composition.relatesTo.target[x]` is a choice type and does not allow extensions, the `alternate-reference` extension can be applied to Reference values within it.

source:
  v: http://hl7.org/fhir/StructureDefinition/Composition
  l: Composition
source version:
  v: 3.0.2
target:
  v: http://hl7.org/fhir/3.0/StructureDefinition/extension-Composition.event.period
  l: extension-Composition.event.period
target version:
  v: 0.1.0
element:
  code:
    v: Composition.event.period
  display:
    v: period
  target:
    modifier extension:
      url:
        v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
        l: extension-ConceptMap.element.target.equivalence
      value: Code
        v: equivalent
    code:
      v: Extension
    equivalence:
      v: equivalent
    comment:
      v: Element `Composition.event.period` is mapped to FHIR R4B element `Composition.event.period` as `SourceIsBroaderThanTarget`. The mappings for `Composition.event.period` do not cover the following types: Period. The mappings for `Composition.event.period` do not cover the following types based on type expansion: end, start.

source:
  v: http://hl7.org/fhir/StructureDefinition/Composition
  l: Composition
source version:
  v: 3.0.2
target:
  v: http://hl7.org/fhir/3.0/StructureDefinition/extension-Composition.section.text
  l: extension-Composition.section.text
target version:
  v: 0.1.0
element:
  code:
    v: Composition.section.text
  display:
    v: text
  target:
    modifier extension:
      url:
        v: http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence
        l: extension-ConceptMap.element.target.equivalence
      value: Code
        v: equivalent
    code:
      v: Extension
    equivalence:
      v: equivalent
    comment:
      v: Element `Composition.section.text` is mapped to FHIR R4B element `Composition.section.text` as `SourceIsBroaderThanTarget`. The mappings for `Composition.section.text` do not cover the following types: Narrative. The mappings for `Composition.section.text` do not cover the following types based on type expansion: div, status. Document profiles may define what content should be represented in the narrative to ensure clinical safety.