To make specified events easier to access, they can be associated with event groups.
You can associate an event with one or more event groups. An event group is a logical grouping of events that match a particular event selector. Event groups are defined in the event infrastructure configuration. For more information about event groups, see Default configuration.
You can use the event access interface to retrieve events that belong to a specified event group. You can restrict the query results by specifying an additional event selector. You can also query events without retrieving them.
You can query event groups in the following ways: