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/tree/main and changes regularly. See the Directory of published versions

• Content
• Detailed Descriptions
• Mappings
• XML
• JSON
• TTL

Logical Model: DDCC Core Data Set Logical Model ( Abstract )

Data elements for the DDCC Core Data Set.

Usage:

• Derived from this Logical Model Profile: DDCC Core Data Set Logical Model for Test Result and DDCC Core Data Set Logical Model for Vaccination Status

Formal Views of Profile Content

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

• Key Elements Table
• Differential Table
• Snapshot Table
• Statistics/References
• All

Name	Flags	Card.	Type	Description & Constraints
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 ele-1: All FHIR elements must have a @value or children
@id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url ele-1: All FHIR elements must have a @value or children ext-1: Must have either extensions or value[x], not both
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized ele-1: All FHIR elements must have a @value or children ext-1: Must have either extensions or value[x], not both
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 ele-1: All FHIR elements must have a @value or children per-1: If present, start SHALL have a lower value than end
@id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url ele-1: All FHIR elements must have a @value or children ext-1: Must have either extensions or value[x], not both
start	ΣC	0..1	dateTime	Certificate valid from ele-1: All FHIR elements must have a @value or children
end	ΣC	0..1	dateTime	Certificate valid until ele-1: All FHIR elements must have a @value or children
Documentation for this format

Constraints

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
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
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 per-1: If present, start SHALL have a lower value than end
@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

Constraints

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

Summary

Mandatory: 0 element(4 nested mandatory elements)

Structures

This structure refers to these other structures:

• DDCC Organization (http://smart.who.int/ddcc/StructureDefinition/DDCCOrganization)

Key Elements View

Name	Flags	Card.	Type	Description & Constraints
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 ele-1: All FHIR elements must have a @value or children
@id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url ele-1: All FHIR elements must have a @value or children ext-1: Must have either extensions or value[x], not both
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized ele-1: All FHIR elements must have a @value or children ext-1: Must have either extensions or value[x], not both
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 ele-1: All FHIR elements must have a @value or children per-1: If present, start SHALL have a lower value than end
@id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url ele-1: All FHIR elements must have a @value or children ext-1: Must have either extensions or value[x], not both
start	ΣC	0..1	dateTime	Certificate valid from ele-1: All FHIR elements must have a @value or children
end	ΣC	0..1	dateTime	Certificate valid until ele-1: All FHIR elements must have a @value or children
Documentation for this format

Constraints

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
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
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 per-1: If present, start SHALL have a lower value than end
@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

Constraints

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

Summary

Mandatory: 0 element(4 nested mandatory elements)

Structures

This structure refers to these other structures:

• DDCC Organization (http://smart.who.int/ddcc/StructureDefinition/DDCCOrganization)

Other representations of profile: CSV, Excel