DIGITAL ITEM ADAPTATION NEGOTIATION MECHANISM

摘要

The present invention relates to digital item adaptation, especially MPEG-21 Digital Item Adaptation (DIA) which requires negotiation between different MPEG-21 peers. Advertisements metadata is defined to hold Digital Item Adaptation descriptions, such as Usage Environment description, BSDL description, XDI description, as well as MPEG-7 Media description in its descriptions element. With that, a generic DIA negotiation mechanism (protocol) using some XML schema based messages for DIA description transmission/exchange/update is defined. A generic and higher-level DIA Negotiation messages is also defined, which is independent from any network protocol, so that descriptions for Digital Item Adaptation can be directly included in the defined messages for registering, transmitting and updating to fulfil DIA description negotiation in those applications that is involved in digital item adaptation.