The term event is used to refer to a single TV program. An event consumes a time period within a service and therefore can be characterized with begin and end times. The service provider determines the granularity in which the service is split in events. An event can be a complete program or an episode of a program. Events can be grouped in series, e.g., to form a serial.
Events are the typical entities which EPGs list to present program schedule information.
The term component is used to refer the constituents of an event. The audio and video of a TV program are obvious examples. In case of multilingual programs there are multiple audio components. In case of interactive programs the components are the application documents and the other data these applications are using. Next to continuous data like audio and video, component also encompasses discrete data like Web pages and applications describing composition and interactivity.