WHO Digital Documentation of COVID-19 Certificates (DDCC)
1.0.0 - CI Build
WHO Digital Documentation of COVID-19 Certificates (DDCC)
1.0.0 - CI Build
WHO Digital Documentation of COVID-19 Certificates (DDCC), published by WHO. This guide is not an authorized publication; it is the continuous build for version 1.0.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/WorldHealthOrganization/ddcc/ and changes regularly. See the Directory of published versions
| Official URL: http://smart.who.int/ddcc/StructureDefinition/DDCCCoreDataSet | Version: 1.0.0 | |||
| Draft as of 2025-09-23 | Computable Name: DDCCCoreDataSet | |||
Data elements for the DDCC Core Data Set.
Usages:
You can also check for usages in the FHIR IG Statistics
Description of Profiles, Differentials, Snapshots and how the different presentations work.
| Name | Flags | Card. | Type | Description & Constraints Filter:   |
|---|---|---|---|---|
  DDCCCoreDataSet |
0..* | Base | This is an abstract type. Child types: DDCCCoreDataSetTR, DDCCCoreDataSetVS DDCC Core Data Set Logical Model | |
  name |
Σ | 1..1 | string | Name |
| birthDate |
Σ | 0..1 | date | Date of birth |
 identifier |
Σ | 0..1 | Identifier | Unique identifier |
 certificate |
Σ | 0..1 | BackboneElement | Certificate Metadata |
 @id |
0..1 | string | Unique id for inter-element referencing | |
 extension |
0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url | |
 modifierExtension |
?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized |
 issuer |
Σ | 1..1 | Reference(DDCC Organization) | Certificate issuer |
| kid |
0..1 | string | Key ID used to verify the signature of the certificate | |
| hcid |
Σ | 1..1 | Identifier | Health certificate identifier (HCID) |
| ddccid |
Σ | 0..1 | Identifier | DDCC Identifier |
| version |
Σ | 1..1 | string | Certificate schema version |
| period |
C | 0..1 | Period | Certificate Validity Period Constraints: per-1 |
| @id |
0..1 | string | Unique id for inter-element referencing | |
| extension |
0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url | |
| start |
ΣC | 0..1 | dateTime | Certificate valid from |
 end |
ΣC | 0..1 | dateTime | Certificate valid until |
| Documentation for this format | ||||
| Id | Grade | Path(s) | Details | Requirements |
| 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() | |
| per-1 | error | DDCCCoreDataSet.certificate.period | If present, start SHALL have a lower value than end : start.hasValue().not() or end.hasValue().not() or (start <= end) |
This structure is derived from Base
| Name | Flags | Card. | Type | Description & Constraints Filter: |
|---|---|---|---|---|
| DDCCCoreDataSet |
0..* | Base | This is an abstract type. Child types: DDCCCoreDataSetTR, DDCCCoreDataSetVS DDCC Core Data Set Logical Model | |
| name |
Σ | 1..1 | string | Name |
| birthDate |
Σ | 0..1 | date | Date of birth |
| identifier |
Σ | 0..1 | Identifier | Unique identifier |
| certificate |
Σ | 0..1 | BackboneElement | Certificate Metadata |
| issuer |
Σ | 1..1 | Reference(DDCC Organization) | Certificate issuer |
| kid |
0..1 | string | Key ID used to verify the signature of the certificate | |
| hcid |
Σ | 1..1 | Identifier | Health certificate identifier (HCID) |
| ddccid |
Σ | 0..1 | Identifier | DDCC Identifier |
| version |
Σ | 1..1 | string | Certificate schema version |
| period |
0..1 | Period | Certificate Validity Period | |
| start |
0..1 | dateTime | Certificate valid from | |
| end |
0..1 | dateTime | Certificate valid until | |
| Documentation for this format | ||||
| Name | Flags | Card. | Type | Description & Constraints Filter: |
|---|---|---|---|---|
| DDCCCoreDataSet |
0..* | Base | This is an abstract type. Child types: DDCCCoreDataSetTR, DDCCCoreDataSetVS DDCC Core Data Set Logical Model | |
| name |
Σ | 1..1 | string | Name |
| birthDate |
Σ | 0..1 | date | Date of birth |
| identifier |
Σ | 0..1 | Identifier | Unique identifier |
| certificate |
Σ | 0..1 | BackboneElement | Certificate Metadata |
| @id |
0..1 | string | Unique id for inter-element referencing | |
| extension |
0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url | |
| modifierExtension |
?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized |
| issuer |
Σ | 1..1 | Reference(DDCC Organization) | Certificate issuer |
| kid |
0..1 | string | Key ID used to verify the signature of the certificate | |
| hcid |
Σ | 1..1 | Identifier | Health certificate identifier (HCID) |
| ddccid |
Σ | 0..1 | Identifier | DDCC Identifier |
| version |
Σ | 1..1 | string | Certificate schema version |
| period |
C | 0..1 | Period | Certificate Validity Period Constraints: per-1 |
| @id |
0..1 | string | Unique id for inter-element referencing | |
| extension |
0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url | |
| start |
ΣC | 0..1 | dateTime | Certificate valid from |
| end |
ΣC | 0..1 | dateTime | Certificate valid until |
| Documentation for this format | ||||
| Id | Grade | Path(s) | Details | Requirements |
| 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() | |
| per-1 | error | DDCCCoreDataSet.certificate.period | If present, start SHALL have a lower value than end : start.hasValue().not() or end.hasValue().not() or (start <= end) |
This structure is derived from Base
Key Elements View
| Name | Flags | Card. | Type | Description & Constraints Filter: |
|---|---|---|---|---|
| DDCCCoreDataSet |
0..* | Base | This is an abstract type. Child types: DDCCCoreDataSetTR, DDCCCoreDataSetVS DDCC Core Data Set Logical Model | |
| name |
Σ | 1..1 | string | Name |
| birthDate |
Σ | 0..1 | date | Date of birth |
| identifier |
Σ | 0..1 | Identifier | Unique identifier |
| certificate |
Σ | 0..1 | BackboneElement | Certificate Metadata |
| @id |
0..1 | string | Unique id for inter-element referencing | |
| extension |
0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url | |
| modifierExtension |
?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized |
| issuer |
Σ | 1..1 | Reference(DDCC Organization) | Certificate issuer |
| kid |
0..1 | string | Key ID used to verify the signature of the certificate | |
| hcid |
Σ | 1..1 | Identifier | Health certificate identifier (HCID) |
| ddccid |
Σ | 0..1 | Identifier | DDCC Identifier |
| version |
Σ | 1..1 | string | Certificate schema version |
| period |
C | 0..1 | Period | Certificate Validity Period Constraints: per-1 |
| @id |
0..1 | string | Unique id for inter-element referencing | |
| extension |
0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url | |
| start |
ΣC | 0..1 | dateTime | Certificate valid from |
| end |
ΣC | 0..1 | dateTime | Certificate valid until |
| Documentation for this format | ||||
| Id | Grade | Path(s) | Details | Requirements |
| 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() | |
| per-1 | error | DDCCCoreDataSet.certificate.period | If present, start SHALL have a lower value than end : start.hasValue().not() or end.hasValue().not() or (start <= end) |
Differential View
This structure is derived from Base
| Name | Flags | Card. | Type | Description & Constraints Filter: |
|---|---|---|---|---|
| DDCCCoreDataSet |
0..* | Base | This is an abstract type. Child types: DDCCCoreDataSetTR, DDCCCoreDataSetVS DDCC Core Data Set Logical Model | |
| name |
Σ | 1..1 | string | Name |
| birthDate |
Σ | 0..1 | date | Date of birth |
| identifier |
Σ | 0..1 | Identifier | Unique identifier |
| certificate |
Σ | 0..1 | BackboneElement | Certificate Metadata |
| issuer |
Σ | 1..1 | Reference(DDCC Organization) | Certificate issuer |
| kid |
0..1 | string | Key ID used to verify the signature of the certificate | |
| hcid |
Σ | 1..1 | Identifier | Health certificate identifier (HCID) |
| ddccid |
Σ | 0..1 | Identifier | DDCC Identifier |
| version |
Σ | 1..1 | string | Certificate schema version |
| period |
0..1 | Period | Certificate Validity Period | |
| start |
0..1 | dateTime | Certificate valid from | |
| end |
0..1 | dateTime | Certificate valid until | |
| Documentation for this format | ||||
Snapshot View
| Name | Flags | Card. | Type | Description & Constraints Filter: |
|---|---|---|---|---|
| DDCCCoreDataSet |
0..* | Base | This is an abstract type. Child types: DDCCCoreDataSetTR, DDCCCoreDataSetVS DDCC Core Data Set Logical Model | |
| name |
Σ | 1..1 | string | Name |
| birthDate |
Σ | 0..1 | date | Date of birth |
| identifier |
Σ | 0..1 | Identifier | Unique identifier |
| certificate |
Σ | 0..1 | BackboneElement | Certificate Metadata |
| @id |
0..1 | string | Unique id for inter-element referencing | |
| extension |
0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url | |
| modifierExtension |
?!Σ | 0..* | Extension | Extensions that cannot be ignored even if unrecognized |
| issuer |
Σ | 1..1 | Reference(DDCC Organization) | Certificate issuer |
| kid |
0..1 | string | Key ID used to verify the signature of the certificate | |
| hcid |
Σ | 1..1 | Identifier | Health certificate identifier (HCID) |
| ddccid |
Σ | 0..1 | Identifier | DDCC Identifier |
| version |
Σ | 1..1 | string | Certificate schema version |
| period |
C | 0..1 | Period | Certificate Validity Period Constraints: per-1 |
| @id |
0..1 | string | Unique id for inter-element referencing | |
| extension |
0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url | |
| start |
ΣC | 0..1 | dateTime | Certificate valid from |
| end |
ΣC | 0..1 | dateTime | Certificate valid until |
| Documentation for this format | ||||
| Id | Grade | Path(s) | Details | Requirements |
| 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() | |
| per-1 | error | DDCCCoreDataSet.certificate.period | If present, start SHALL have a lower value than end : start.hasValue().not() or end.hasValue().not() or (start <= end) |
This structure is derived from Base