CDA to FHIR Maps
0.1.0 - ci-build

CDA to FHIR Maps, published by HL7 Italy. This guide is not an authorized publication; it is the continuous build for version 0.1.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/hl7-it/cda2fhir/ and changes regularly. See the Directory of published versions

## Extension: reference

Official URL: http://hl7.it/fhir/cda2fhir/StructureDefinition/references-C | Version: 0.1.0
Draft as of 2025-10-01 | Computable Name: ReferencesC

Context of Use

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

- Element ID: `Element`

Usage info

Usages:

- Use this Extension: StructureMapProfile

You can also check for usages in the FHIR IG Statistics

### Formal Views of Extension Content

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

- Differential Table
- Snapshot Table
- Statistics/References
- All

This structure is derived from Extension

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | reference
url |  | 1..1 | uri | "http://hl7.it/fhir/cda2fhir/StructureDefinition/references-C"
Documentation for this format

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | reference
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "http://hl7.it/fhir/cda2fhir/StructureDefinition/references-C"
value[x] |  | 0..1 |  | Value of extension
valueBase64Binary |  |  | base64Binary |
valueBoolean |  |  | boolean |
valueCanonical |  |  | canonical(Any) |
valueCode |  |  | code |
valueDate |  |  | date |
valueDateTime |  |  | dateTime |
valueDecimal |  |  | decimal |
valueId |  |  | id |
valueInstant |  |  | instant |
valueInteger |  |  | integer |
valueMarkdown |  |  | markdown |
valueOid |  |  | oid |
valuePositiveInt |  |  | positiveInt |
valueString |  |  | string |
valueTime |  |  | time |
valueUnsignedInt |  |  | unsignedInt |
valueUri |  |  | uri |
valueUrl |  |  | url |
valueUuid |  |  | uuid |
valueAddress |  |  | Address |
valueAge |  |  | Age |
valueAnnotation |  |  | Annotation |
valueAttachment |  |  | Attachment |
valueCodeableConcept |  |  | CodeableConcept |
valueCoding |  |  | Coding |
valueContactPoint |  |  | ContactPoint |
valueCount |  |  | Count |
valueDistance |  |  | Distance |
valueDuration |  |  | Duration |
valueHumanName |  |  | HumanName |
valueIdentifier |  |  | Identifier |
valueMoney |  |  | Money |
valuePeriod |  |  | Period |
valueQuantity |  |  | Quantity |
valueRange |  |  | Range |
valueRatio |  |  | Ratio |
valueReference |  |  | Reference(Any) |
valueSampledData |  |  | SampledData |
valueSignature |  |  | Signature |
valueTiming |  |  | Timing |
valueContactDetail |  |  | ContactDetail |
valueContributor |  |  | Contributor |
valueDataRequirement |  |  | DataRequirement |
valueExpression |  |  | Expression |
valueParameterDefinition |  |  | ParameterDefinition |
valueRelatedArtifact |  |  | RelatedArtifact |
valueTriggerDefinition |  |  | TriggerDefinition |
valueUsageContext |  |  | UsageContext |
valueDosage |  |  | Dosage |
valueMeta |  |  | Meta |
Documentation for this format

This structure is derived from Extension

Summary

Simple Extension with the type base64Binary, boolean, canonical, code, date, dateTime, decimal, id, instant, integer, markdown, oid, positiveInt, string, time, unsignedInt, uri, url, uuid, Address, Age, Annotation, Attachment, CodeableConcept, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, Reference, SampledData, Signature, Timing, ContactDetail, Contributor, DataRequirement, Expression, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, Dosage, Meta:

Differential View

This structure is derived from Extension

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | reference
url |  | 1..1 | uri | "http://hl7.it/fhir/cda2fhir/StructureDefinition/references-C"
Documentation for this format

Snapshot View

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | reference
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "http://hl7.it/fhir/cda2fhir/StructureDefinition/references-C"
value[x] |  | 0..1 |  | Value of extension
valueBase64Binary |  |  | base64Binary |
valueBoolean |  |  | boolean |
valueCanonical |  |  | canonical(Any) |
valueCode |  |  | code |
valueDate |  |  | date |
valueDateTime |  |  | dateTime |
valueDecimal |  |  | decimal |
valueId |  |  | id |
valueInstant |  |  | instant |
valueInteger |  |  | integer |
valueMarkdown |  |  | markdown |
valueOid |  |  | oid |
valuePositiveInt |  |  | positiveInt |
valueString |  |  | string |
valueTime |  |  | time |
valueUnsignedInt |  |  | unsignedInt |
valueUri |  |  | uri |
valueUrl |  |  | url |
valueUuid |  |  | uuid |
valueAddress |  |  | Address |
valueAge |  |  | Age |
valueAnnotation |  |  | Annotation |
valueAttachment |  |  | Attachment |
valueCodeableConcept |  |  | CodeableConcept |
valueCoding |  |  | Coding |
valueContactPoint |  |  | ContactPoint |
valueCount |  |  | Count |
valueDistance |  |  | Distance |
valueDuration |  |  | Duration |
valueHumanName |  |  | HumanName |
valueIdentifier |  |  | Identifier |
valueMoney |  |  | Money |
valuePeriod |  |  | Period |
valueQuantity |  |  | Quantity |
valueRange |  |  | Range |
valueRatio |  |  | Ratio |
valueReference |  |  | Reference(Any) |
valueSampledData |  |  | SampledData |
valueSignature |  |  | Signature |
valueTiming |  |  | Timing |
valueContactDetail |  |  | ContactDetail |
valueContributor |  |  | Contributor |
valueDataRequirement |  |  | DataRequirement |
valueExpression |  |  | Expression |
valueParameterDefinition |  |  | ParameterDefinition |
valueRelatedArtifact |  |  | RelatedArtifact |
valueTriggerDefinition |  |  | TriggerDefinition |
valueUsageContext |  |  | UsageContext |
valueDosage |  |  | Dosage |
valueMeta |  |  | Meta |
Documentation for this format

This structure is derived from Extension

Summary

Simple Extension with the type base64Binary, boolean, canonical, code, date, dateTime, decimal, id, instant, integer, markdown, oid, positiveInt, string, time, unsignedInt, uri, url, uuid, Address, Age, Annotation, Attachment, CodeableConcept, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, Reference, SampledData, Signature, Timing, ContactDetail, Contributor, DataRequirement, Expression, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, Dosage, Meta:

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()`