| http://www.w3.org/ns/prov#value | - As shown in FIG. 2A, one frame of information has a section overhead area 10, path information areas 12-1 - 12-n, and path overhead areas 14-1-14n provided respectively for the path information areas 12-1-12-n where n=N. The section overhead area 10 is used for transmitting control messages, such as the restoration message and the acknowledgement message.
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