> For the complete documentation index, see [llms.txt](https://developer.collibra.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.collibra.com/workflows/designing-workflows/processes/shape-repository/message-boundary-event.md).

# Message boundary event

This event is triggered by the arrival of a message.

<img src="/files/0Q1XZqUkqT6QWKNi04nY" alt="" width="25%">

## General properties

| Property           | Description                                                                                                        |
| ------------------ | ------------------------------------------------------------------------------------------------------------------ |
| Model ID           | The unique identifier of the element within the process model.                                                     |
| Name               | The name of the element displayed in the diagram.                                                                  |
| Documentation      | A description and any additional information about this element.                                                   |
| Cancel activity    | Whether the activity should be canceled or not.                                                                    |
| Message reference  | A reference from the message definitions of the root model.                                                        |
| Message expression | An expression resolving to a message name without needing to define a message event on the process instance level. |

## Advanced properties

| Property            | Description                                                                                                                                                                                                                                                                                                                                       |
| ------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Execution listeners | <p>Allows you to invoke Java logic after certain events:</p><ul><li><strong>Start</strong>: Executes after the activity has been started.</li><li><strong>End</strong>: Executes after the activity was completed.</li><li><strong>Transition</strong>: When defined on a sequence flow, executes once the flow is transition is taken.</li></ul> |

## Visual properties

| Property         | Description                                         |
| ---------------- | --------------------------------------------------- |
| Font size        | The font size of the element in the diagram.        |
| Font weight      | The font weight of the element in the diagram.      |
| Font style       | The font style of the element in the diagram.       |
| Font color       | The font color of the element in the diagram.       |
| Background color | The background color of the element in the diagram. |
| Border color     | The border color of the element in the diagram.     |