Open Health Hub FHIR Implementation Guide - Local Development build (v0.1.0) built by the FHIR (HL7® FHIR® Standard) Build Tools. See the Directory of published versions
Extension: Task UUID
| Official URL: https://api.openhealthhub.com/OpenHealthhub/fhir/4/StructureDefinition/task-uuid | Version: 0.1.0 | |||
| Active as of 2026-10-27 | Computable Name: TaskUuid | |||
The UUID of the program task this activity or Task represents
Context of Use
This extension may be used on the following element(s):
- Element ID CarePlan.activity.detail
- Element ID Task
Usage info
Usages:
- Use this Extension: OHH Participant Task Profile, OHH Questionnaire Task Profile and OHH Retrieve Care Plan Profile
- Examples for this Extension: CarePlan/4, Task/33770638-93ac-43ca-bf3f-3fd180808d22 and Task/589aa301-e69c-4bfa-9a44-7fd5d7b0c5d9
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.
This structure is derived from Extension
This structure is derived from Extension
| Name | Flags | Card. | Type | Description & Constraints Filter:  |
|---|---|---|---|---|
  Extension |
0..* | Extension | Task UUID | |
  id |
0..1 | string | Unique id for inter-element referencing | |
 extension |
0..0 | Extension Slice: Unordered, Open by value:url Slicing Note: The rules on this element (including its children) apply to all the slices, but are not repeated in them | ||
| url |
1..1 | uri | "https://api.openhealthhub.com/OpenHealthhub/fhir/4/StructureDefinition/task-uuid" | |
 value[x] |
0..1 | string | Value of extension | |
| Documentation for this format | ||||
This structure is derived from Extension
Differential View
This structure is derived from Extension
Snapshot View
| Name | Flags | Card. | Type | Description & Constraints Filter: |
|---|---|---|---|---|
| Extension |
0..* | Extension | Task UUID | |
| id |
0..1 | string | Unique id for inter-element referencing | |
| extension |
0..0 | Extension Slice: Unordered, Open by value:url Slicing Note: The rules on this element (including its children) apply to all the slices, but are not repeated in them | ||
| url |
1..1 | uri | "https://api.openhealthhub.com/OpenHealthhub/fhir/4/StructureDefinition/task-uuid" | |
| value[x] |
0..1 | string | Value of extension | |
| Documentation for this format | ||||
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()
|