| http://www.w3.org/ns/prov#value | - [0008] Specific embodiments of the present invention will now be described with reference to the accompanying drawings, in which: [0009]FIG. 1 is a schematic diagram of the main components of a system in an embodiment of the present invention; [0010]FIG. 2 is a time diagram of signals passed between the main components in the operation of the system; [0011]FIG. 3 is a diagram of sequence of screen
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