Re: FriendFeed's Simple Update Protocol

Hello,

On Sat, Dec 6, 2008 at 7:48 AM, rcade <[email protected]> wrote:
> FriendFeed is working on Simple Update Protocol (SUP), a means of
> discovering when feeds on a particular service have been updated
> without polling the individual feeds:
>
> http://code.google.com/p/simpleupdateprotocol/
>
> Feeds indicate their updates can be tracked with SUP by using a new
> channel-link tag, as in this example from an Atom feed:
>
> <link rel="http://api.friendfeed.com/2008/03#sup"
> href="http://friendfeed.com/api/sup.json#53924729"
> type="application/json" />
>
> The rel attribute identifies an ID for the feed, called its SUP-ID.
> The href attribute contains a URL that uses JSON data to identify
> updated feeds by their SUP-IDs.
>
> My first take on the protocol is that defining a relationship with a
> URI is too different than standard link relationships in HTML:
>
> http://www.w3.org/TR/REC-html40/types.html#type-links

AFAIK, Atom requires you to use URLs for non-standard "rel" attribute
values.  So what SUP is doing for the "rel" attribute is correct.

> Also, neither RSS 1.0 nor RSS 2.0 allows multiple channel-link tags,
> so this would only be valid in an Atom feed.
>
> Both of these concerns could be addressed by identifying the SUP
> provider with a new namespace like this:
>
> <rss xmlns:sup="http://friendfeed.com/api/sup/">
> <channel>
> <sup:provider href="http://friendfeed.com/api/sup.json#53924729"
> type="application/json" />
> ...

You could also just use Atomic RSS...

http://www.tbray.org/ongoing/When/200x/2005/07/27/Atomic-RSS

... and get...

<rss xmlns:atom="http://www.w3.org/2005/Atom">
<channel>
<atom:link rel="http://api.friendfeed.com/2008/03#sup"
href="http://friendfeed.com/api/sup.json#53924729"
type="application/json" />
...

That way SUP looks basically the same in Atom and RSS.

--
Charles Iliya Krempeaux, B.Sc.
http://changelog.ca/

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