META-data details
This is the META data parsed by the META inspector extension.

Head title
<head>
   <title>title</title>
</head>
Meta tags
<head>
   <meta name='description' content='text' />
   <meta name='keywords' content='keywords list' />
</head>
A Rel
<body>
   <a href='url' rel='nofollow'/>text</a>
   <a href='url' rel='bookmark'/>text</a>
   <a href='url' rel='tag'/>text</a>
</body> no-follow links
XFN
Some specifics A REL tags: <body>
   <a href='url' rel='me'/>text</a>
   <a href='url' rel='friend'/>text</a>
</body> The accepted values are: contact, acquaintance, friend, met, colleague, neighbor, child, parent, sibling, spouse, kin, muse, crush, date, sweetheart, me, co-worker, co-resident
XFN tags
Microformats
"Are a set of standards for embedding easily extractable data on your pages, using technologies you are comfortable with today."
Basically HTML tags with specific classes:
<body>
   <div class='hreview' />text</div>
   <div class='hcard' />text</div>
</body> microformats
Common Tag
<body>
   <span typeof='ctag:Tag' rel='ctag:means'
      resource='http://rdf.freebase.com/ns/en.u2'/>
</body> Common Tag
Other HTML tags
<body>
   <iframe src='url' />
</body>
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