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Design Choices Multicast Transport Protocol ALC/FLUTE is a very good candidate Subscribe (unicast) SIP and SIP events Metadata Envelope a. XML file / wrapper b. Header extension of transport protocols Allow both methods? Or not? Data Types and Channelisation Could correlate data type and transport channel, e.g. “pointer-only channel” Could divide delivery over multiple channels Multicast multi-layer congestion control usage Both unicast and multicast channels could be employed |