| http://www.w3.org/ns/prov#value | - it is unsolicited, and more to the point, it takes advantage of a local firewall possibly being temporarily open for traffic FROM an address for a short while after connecting TO it.There might be a good cause, like collecting a list of open proxies for the poor guy behind the Great Firewall of China or something similar, but it is still unsolicted, clandestine and not documented.Here are a couple
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