| http://www.w3.org/ns/prov#value | - to each of the principal embodiments of the invention, with at least the callees all indicated in a group document; [0017]FIG. 2 is a schematic illustrating different mechanisms by which the group document is communicated between entities, such as between the caller and the conference server; [0018]FIG. 3 is a schematic illustrating the use of each of the communication mechanisms of FIG. 2 in an e
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