Clinical Document Architecture - Local Development build (v2.0.1-sd-202510-matchbox-patch) built by the FHIR (HL7® FHIR® Standard) Build Tools. See the Directory of published versions
| Active as of 2025-10-29 | 
Definitions for the xs-ID data type profile.
Guidance on how to interpret the contents of this table can be foundhere
| 0. id | |
| Definition | Any combination of letters, numerals, "-" and ".", with a length limit of 64 characters. (This might be an integer, an unprefixed OID, UUID or any other identifier pattern that meets these constraints.) Ids are case-insensitive.  | 
| Short | Primitive Type id | 
| Comments | RFC 4122  | 
| Control | 0..* | 
| Is Modifier | false | 
| XML Format | In the XML format, this property has the namespace urn:hl7-org:v3. | 
| Summary | false | 
| Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) | 
| 2. id.id | |
| Definition | unique id for the element within a resource (for internal references) Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.  | 
| Short | xml:id (or equivalent in JSON)Unique id for inter-element referencing | 
| Control | 0..01 This element is affected by the following invariants: ele-1  | 
| Type | string | 
| Is Modifier | false | 
| XML Format | In the XML format, this property is represented as an attribute. | 
| Summary | false | 
| 4. id.extension | |
| Definition | An Extension May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.  | 
| Short | ExtensionAdditional content defined by implementations | 
| Comments | There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.  | 
| Control | 0..0* | 
| Type | Extension | 
| Is Modifier | false | 
| Summary | false | 
| Alternate Names | extensions, user content | 
| Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())  | 
Guidance on how to interpret the contents of this table can be foundhere
| 0. id | |
| XML Format | In the XML format, this property has the namespace urn:hl7-org:v3. | 
| 2. id.id | |
| Control | 0..0 | 
| 4. id.extension | |
| Control | 0..0 | 
Guidance on how to interpret the contents of this table can be foundhere
| 0. id | |
| Definition | Any combination of letters, numerals, "-" and ".", with a length limit of 64 characters. (This might be an integer, an unprefixed OID, UUID or any other identifier pattern that meets these constraints.) Ids are case-insensitive.  | 
| Short | Primitive Type id | 
| Comments | RFC 4122  | 
| Control | 0..* | 
| Is Modifier | false | 
| XML Format | In the XML format, this property has the namespace urn:hl7-org:v3. | 
| Summary | false | 
| Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) | 
| 2. id.id | |
| Definition | unique id for the element within a resource (for internal references)  | 
| Short | xml:id (or equivalent in JSON) | 
| Control | 0..0 | 
| Type | string | 
| Is Modifier | false | 
| XML Format | In the XML format, this property is represented as an attribute. | 
| Summary | false | 
| 4. id.extension | |
| Definition | An Extension  | 
| Short | Extension | 
| Control | 0..0 | 
| Type | Extension | 
| Is Modifier | false | 
| Summary | false | 
| Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))ext-1: Must have either extensions or value[x], not both ( extension.exists() != value.exists()) | 
| 6. id.value | |
| Definition | Primitive value for id  | 
| Short | Primitive value for id | 
| Control | 0..1 | 
| Type | id | 
| Is Modifier | false | 
| XML Format | In the XML format, this property is represented as an attribute. | 
| Summary | false |