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Base [StructureDefinition](/content/docs/api/fhir/resources/structuredefinition/index.html) for [Annotation](/content/docs/api/fhir/datatypes/annotation/index.html) Type: A text note which also contains information about who made the statement and when.

## Elements

| Name | Required | Type | Description |
| --- | --- | --- | --- |
| id |  | string | Unique id for inter-element referencing<br>Details<br>Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces. |
| extension |  | [Extension](/content/docs/api/fhir/datatypes/extension/index.html)\[\] | Additional content defined by implementations<br>Details<br>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 manageable, 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.<br>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. |
| author[x] |  | Reference< [Practitioner](/content/docs/api/fhir/resources/practitioner/index.html)<br> \| [Patient](/content/docs/api/fhir/resources/patient/index.html)<br> \| [RelatedPerson](/content/docs/api/fhir/resources/relatedperson/index.html)<br> \| [Organization](/content/docs/api/fhir/resources/organization/index.html) >, string | Individual responsible for the annotation<br>Details<br>The individual responsible for making the annotation.<br>Organization is used when there's no need for specific attribution as to who made the comment. |
| time |  | dateTime | When the annotation was made<br>Details<br>Indicates when this particular annotation was made. |
| text | ✓ | markdown | The annotation - text content (as markdown)<br>Details<br>The text of the annotation in markdown format.