> ## Documentation Index
> Fetch the complete documentation index at: https://docs.metriport.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Annotation

> Base StructureDefinition for Annotation Type: A  text note which also  contains information about who made the statement and when.

## Properties

| Name | Required | Type | Description |
| - | - | - | - |
| id | No | string | Unique id for inter-element referencing |
| extension | No | [Extension](/medical-api/fhir/data-types/extension)\[] | Additional content defined by implementations |
| author\[x] | No | Reference\<[Practitioner](/medical-api/fhir/resources/practitioner) / [Patient](/medical-api/fhir/resources/patient) / [RelatedPerson](/medical-api/fhir/resources/relatedperson) / [Organization](/medical-api/fhir/resources/organization)>, string | Individual responsible for the annotation |
| time | No | dateTime | When the annotation was made |
| text | Yes | markdown | The annotation - text content (as markdown) |


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