> ## 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.

# Meta

> Base StructureDefinition for Meta Type: The metadata about a resource. This is content in the resource that is maintained by the infrastructure. Changes to the content might not always be associated with version changes to the resource.

## 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                                                 |
| versionId   | No       | id                                                     | Version specific identifier                                                                   |
| lastUpdated | No       | instant                                                | When the resource version last changed                                                        |
| source      | No       | uri                                                    | Identifies where the resource comes from                                                      |
| profile     | No       | canonical\[]                                           | Profiles this resource claims to conform to                                                   |
| security    | No       | [Coding](/medical-api/fhir/data-types/coding)\[]       | Security Labels applied to this resource                                                      |
| tag         | No       | [Coding](/medical-api/fhir/data-types/coding)\[]       | Tags applied to this resource                                                                 |
| project     | No       | uri                                                    | The project that contains this resource.                                                      |
| author      | No       | Reference\<>                                           | The individual, device or organization who initiated the last change.                         |
| account     | No       | Reference\<>                                           | Optional account reference that can be used for sub-project compartments.                     |
| compartment | No       | Reference\<>\[]                                        | The list of compartments containing this resource. This is readonly and is set by the server. |