Setting content-type in link attributes

Reading a [comment on AlsacrĂŠations](http://forum.alsacreations.com/topic-9-47144-3-Debat--URL- Rewriting-avec-ou-sans-ID-.html#p332138), I've discovered that there is a type attribute defined in the link section of the HTML 4.01 spec.

In a nutshell, it's an optional attribute that one can add to a tag to tell the browser the content type it is supposed to receive if following the link.