Method and an apparatus for processing a broadcast signal including an interactive broadcast service

A method of processing a broadcast service at a transmitter, the method comprising:

• generating an application signaling element containing metadata about applications;
• generating an event message element used for delivering one or more timing information which set presentation times for events;
• generating packets including the application signaling element and the event message element;
• transmitting the broadcast service via a broadcast channel;
• and
• transmitting the packets via the broadcast channel or an internet network,
• wherein the application signaling element includes an application identification attribute identifying an application, and
• wherein the application signaling element further includes capability element specifying capabilities that are essential for a meaningful presentation of the application.

A transmitter for processing a broadcast service, the transmitter comprising:

• a signaling encoder that generates an application signaling element containing metadata about applications, and generates an event message element used for delivering one or more timing information which set presentation times for events;
• a packet encoder that generates packets including the application signaling element and the event message element;
• and
• a transmission device that transmits the broadcast service via a broadcast channel, and transmits the packets via the broadcast channel or an internet network,
• wherein the application signaling element includes an application identification attribute identifying an application, and
• wherein the application signaling element further includes capability element specifying capabilities that are essential for a meaningful presentation of the application.