> ## 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. |


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