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Doctype linking to fb?

bocaj
in Frontend

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I've never seen this, just wondered if anyone could give me a quick explanation or something, i'll have a look into it myself but figured someone might already know :p

 

Stumbled across a site with this in the html tag, not the doctype, sorry if the title's misleading, i generally class the doctype, and html declarations as one.

 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xmlns:fb="http://www.facebook.com/2008/fbml">  
<head profile="http://www.w3.org/2005/10/profile">

 

Just a little curious about this 

xmlns:fb="http://www.facebook.com/2008/fbml

 

Is it some way of intertwining facebook with sites or vice versa? Does facebook have an api? I feel so out of touch :(

 

I've not really scanned the rest of their code for further fb references, but just wondered if anyone could give a quick explanation :)

Yes Facebook has an API.

 

That has something to do with using FBML tags in the page.

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