Clinical Document Architecture with Australian Schema, published by Australian Digital Health Agency. This guide is not an authorized publication; it is the continuous build for version 1.0.1 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/AuDigitalHealth/cda-au-schema/ and changes regularly. See the Directory of published versions
| Official URL: http://hl7.org/cda/stds/core/StructureDefinition/II | Version: 1.0.1 | |||
| Active as of 2025-11-02 | Maturity Level: 1 | Responsible: HL7 | Computable Name: II | |
An identifier that uniquely identifies a thing or object. Examples are object identifier for HL7 RIM objects, medical record number, order id, service catalog item id, Vehicle Identification Number (VIN), etc. Instance identifiers are defined based on ISO object identifiers.
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:  ![]() ![]()  | 
|---|---|---|---|---|
![]()  | 
C | 1..* | ANY | XML Namespace: urn:hl7-org:v3 Base for all types and resources Elements defined in Ancestors:@nullFlavor Logical Container: ClinicalDocument (CDA Class) Constraints: II-1  | 
![]() ![]()  | 
0..1 | cs | Binding: CDANullFlavor (required) | |
![]() ![]()  | 
0..1 | st | ||
![]() ![]()  | 
0..1 | bl | ||
![]() ![]()  | 
0..1 | oid, uuid, ruid | ||
![]() ![]()  | 
0..1 | st | ||
  Documentation for this format | ||||
| Path | Status | Usage | ValueSet | Version | Source | 
| II.nullFlavor | Base | required | CDANullFlavor | 📦1.0.1 | This IG | 
| Id | Grade | Path(s) | Description | Expression | 
| II-1 | error | II | An II instance must have either a root or an nullFlavor. | 
      root.exists() or nullFlavor.exists()
     | 
  
This structure is derived from ANY
| Name | Flags | Card. | Type | Description & Constraints    Filter:  ![]() ![]()  | 
|---|---|---|---|---|
![]()  | 
C | 1..* | ANY | XML Namespace: urn:hl7-org:v3 Base for all types and resources Elements defined in Ancestors:@nullFlavor Logical Container: ClinicalDocument (CDA Class) Constraints: II-1  | 
![]() ![]()  | 
0..1 | st | ||
![]() ![]()  | 
0..1 | bl | ||
![]() ![]()  | 
0..1 | oid, uuid, ruid | ||
![]() ![]()  | 
0..1 | st | ||
  Documentation for this format | ||||
| Id | Grade | Path(s) | Description | Expression | 
| II-1 | error | II | An II instance must have either a root or an nullFlavor. | 
      root.exists() or nullFlavor.exists()
     | 
  
| Name | Flags | Card. | Type | Description & Constraints    Filter:  ![]() ![]()  | 
|---|---|---|---|---|
![]()  | 
C | 1..* | ANY | XML Namespace: urn:hl7-org:v3 Base for all types and resources Elements defined in Ancestors:@nullFlavor Logical Container: ClinicalDocument (CDA Class) Constraints: II-1  | 
![]() ![]()  | 
0..1 | cs | Binding: CDANullFlavor (required) | |
![]() ![]()  | 
0..1 | st | ||
![]() ![]()  | 
0..1 | bl | ||
![]() ![]()  | 
0..1 | oid, uuid, ruid | ||
![]() ![]()  | 
0..1 | st | ||
  Documentation for this format | ||||
| Path | Status | Usage | ValueSet | Version | Source | 
| II.nullFlavor | Base | required | CDANullFlavor | 📦1.0.1 | This IG | 
| Id | Grade | Path(s) | Description | Expression | 
| II-1 | error | II | An II instance must have either a root or an nullFlavor. | 
      root.exists() or nullFlavor.exists()
     | 
  
This structure is derived from ANY
Summary
Structures
This structure refers to these other structures:
Extensions
This structure refers to these extensions:
Maturity: 1
Key Elements View
| Name | Flags | Card. | Type | Description & Constraints    Filter:  ![]() ![]()  | 
|---|---|---|---|---|
![]()  | 
C | 1..* | ANY | XML Namespace: urn:hl7-org:v3 Base for all types and resources Elements defined in Ancestors:@nullFlavor Logical Container: ClinicalDocument (CDA Class) Constraints: II-1  | 
![]() ![]()  | 
0..1 | cs | Binding: CDANullFlavor (required) | |
![]() ![]()  | 
0..1 | st | ||
![]() ![]()  | 
0..1 | bl | ||
![]() ![]()  | 
0..1 | oid, uuid, ruid | ||
![]() ![]()  | 
0..1 | st | ||
  Documentation for this format | ||||
| Path | Status | Usage | ValueSet | Version | Source | 
| II.nullFlavor | Base | required | CDANullFlavor | 📦1.0.1 | This IG | 
| Id | Grade | Path(s) | Description | Expression | 
| II-1 | error | II | An II instance must have either a root or an nullFlavor. | 
      root.exists() or nullFlavor.exists()
     | 
  
Differential View
This structure is derived from ANY
| Name | Flags | Card. | Type | Description & Constraints    Filter:  ![]() ![]()  | 
|---|---|---|---|---|
![]()  | 
C | 1..* | ANY | XML Namespace: urn:hl7-org:v3 Base for all types and resources Elements defined in Ancestors:@nullFlavor Logical Container: ClinicalDocument (CDA Class) Constraints: II-1  | 
![]() ![]()  | 
0..1 | st | ||
![]() ![]()  | 
0..1 | bl | ||
![]() ![]()  | 
0..1 | oid, uuid, ruid | ||
![]() ![]()  | 
0..1 | st | ||
  Documentation for this format | ||||
| Id | Grade | Path(s) | Description | Expression | 
| II-1 | error | II | An II instance must have either a root or an nullFlavor. | 
      root.exists() or nullFlavor.exists()
     | 
  
Snapshot View
| Name | Flags | Card. | Type | Description & Constraints    Filter:  ![]() ![]()  | 
|---|---|---|---|---|
![]()  | 
C | 1..* | ANY | XML Namespace: urn:hl7-org:v3 Base for all types and resources Elements defined in Ancestors:@nullFlavor Logical Container: ClinicalDocument (CDA Class) Constraints: II-1  | 
![]() ![]()  | 
0..1 | cs | Binding: CDANullFlavor (required) | |
![]() ![]()  | 
0..1 | st | ||
![]() ![]()  | 
0..1 | bl | ||
![]() ![]()  | 
0..1 | oid, uuid, ruid | ||
![]() ![]()  | 
0..1 | st | ||
  Documentation for this format | ||||
| Path | Status | Usage | ValueSet | Version | Source | 
| II.nullFlavor | Base | required | CDANullFlavor | 📦1.0.1 | This IG | 
| Id | Grade | Path(s) | Description | Expression | 
| II-1 | error | II | An II instance must have either a root or an nullFlavor. | 
      root.exists() or nullFlavor.exists()
     | 
  
This structure is derived from ANY
Summary
Structures
This structure refers to these other structures:
Extensions
This structure refers to these extensions:
Maturity: 1