It might a bug in documentation or just me getting it wrong, but in any case I think it is confusing to see several different definitions of the same fb: namespace:

  • xmlns:fb="http://www.facebook.com/2008/fbml"
    Given as example here.
  • xmlns:fb="http://ogp.me/ns/fb#"
    Shows up in the generated XFBML code here.

So which one should the developers use?

facebook namespaces
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