| http://www.w3.org/ns/prov#value | - G. 1 is a very schematic representation of an existing system for unicast connection, and FIG. 2 is a similar diagram relating to multicast connection. [0015] In FIG. 1, reference numerals 20-1, 20-2, 20-3, 20-N-1, 20-N designate web servers, which are connected to network devices, such as 22-1, 22-2, 22-3, 224, and 22-5 known as a routers (only five of them are shown only as an example).
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