## 4.2.13.8.2  CloudEvents Context Attributes
Events published through the enterprise event enablement are compliant with the CloudEvents specification. Context attributes contained in events are listed in this topic.
The following table lists required and optional context attributes of the CloudEvents specification (https:/ / cloudevents.io ).
| Context Attribute   | Requirement   | Description                   |
|---------------------|---------------|-------------------------------|
| id                  | required      | identifies the event instance |
| Context Attribute   | Requirement   | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|---------------------|---------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| source              | required      | identifies the issuer of the event containing: • region • the region where the application service is located • value: default • applicationNamespace • the registered namespace of the application, which emits the event • value sap.s4.beh for SAP released events sap.abap.custom for events created by cus- tomers • instanceID • identifier of the application instance issuing the event • value: represented through the cloud landscape directory (CLD) tenant ID of the ABAP environment tenant.  Note |
| specversion         | required      | specifies the version of the CloudEvents specification, which the event uses currently: 1.0                                                                                                                                                                                                                                                                                                                                                                                                                       |
| type                | required      | specifies the type of event                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| datacontenttype     | optional      | content type of the event                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| time                | optional      | timestamp of the occurrence of the event                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| data                | optional      | business payload of the event                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |