XFN, or the XHTML Friends Network, is a way of showing human relationships using hyperlinks. It is especially helpful for blogrolls, where you can specify whether the person is a friend, family, etc.
An example of an XFN enabled link is the following:
<a href="http://little-brother.example.com/" rel="sibling">My Brother's Blog</a>Some software packages support the tracking of XFN, so you can know how other people feel about you.
For more information check out the official XFN site.
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