Activity task has been completed.

Activity task has failed.

Activity task has been scheduled.

Recorded result of a side-efect.

Workflow has received a signal.

SubWorkflow cancellation has been requested.

SubWorkflow has completed.

SubWorkflow has failed.

SubWorkflow has been scheduled.

Timer has been canceled.

Timer has fired.

Timer has been scheduled.

Workflow has been canceled.

Workflow has continued as new.

Workflow has finished.

Workflow has started.

Workflow has been terminated (not yet used).

Workflow task has been started.

WorkflowEvent is a event addressed for a specific workflow instance.