| http://www.w3.org/ns/prov#value | - A distributed communications network as in claim 23, whereineach node is arranged to store in its memory means in respect of each of its links, a list of pointers to stored connection structures in which that link is an upstream link in a said data transmission circuit passing through that node, and a list of pointers to stored connection structures in which that link is a downstream link in a sai
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