> ## 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.

# TriggerDefinition

> Base StructureDefinition for TriggerDefinition Type: A description of a triggering event. Triggering events can be named events, data events, or periodic, as determined by the type element.

## 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                                                                         |
| type       | Yes      | code                                                                                                                        | named-event / periodic / data-changed / data-added / data-modified / data-removed / data-accessed / data-access-ended |
| name       | No       | string                                                                                                                      | Name or URI that identifies the event                                                                                 |
| timing\[x] | No       | [Timing](/medical-api/fhir/data-types/timing), Reference\<[Schedule](/medical-api/fhir/resources/schedule)>, date, dateTime | Timing of the event                                                                                                   |
| data       | No       | [DataRequirement](/medical-api/fhir/data-types/datarequirement)\[]                                                          | Triggering data of the event (multiple = 'and')                                                                       |
| condition  | No       | [Expression](/medical-api/fhir/data-types/expression)                                                                       | Whether the event triggers (boolean expression)                                                                       |