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XFN
This specifies social relationships and rel-me links among profiles for the same person.
<a href="http://josh.example.com/" rel="friend met"> Josh</a><a href="http://kat.example.com/" rel="met acquaintance"> Kat</a><a href="http://mary.example.com/" rel="co-worker friend met"> Mary</a><a href="http://nick.example.com/">Nick</a>