| 摘要 |
Specific requirements for a protocol, which deal with a program guide describing meta-data of content, are described. This protocol enables users and devices to select up-to-date and appropriate content out of a large number of unnecessary content. The protocol allows subscribers (having program guide receivers) to receive updates (from a program guide sender) to either an entire program guide or portion of a program guide, wherein the portion of program guide is defined according to a set of preferences and constraints. Communications between the program guide sender and the program guide receiver are accomplished using a protocol such as a session initiated protocol (SIP).
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