[Playlist] rel = alternate for XSPF

[Lucas Gonze]

Chris Anderson wrote:
> I've been thinking about using a link tag to provide a semantic link
> between my html pages, and their xspf equivalents. Something like:
> 
> <link rel="alternate" type="application/xspf+xml" title="2del on Music
> For Dozens" href="http://mfdz.com/2del.xspf" />
> 
> Is anyone else using this or something like it? If there is a prior
> method in use, I'll stick with convention. Otherwise, this looks right
> to me. Maybe we'll see something like it on Webjay someday. :)

We used to do this on Webjay a long time ago, but took it out because it 
felt like a vanity.  If it's useful we can re-enable that code.

Brainstorming about uses of the tag --

A Greasemonkey script that auto-inserted a player when it found this link.

A screen scraper that took advantage of the XSPF version to get 
formatted semantics of links within the document.  For example it would 
be able to identify the creator of a particular track by using 
information within the XSPF.