Re: Re: Feed, know thyself?

On 17 Jan 2005, at 14:20, ecomputerd wrote:

> I agree about the urgent need for a universal way of being able to
> sign up for a feed from a browser. And I agree that a self-
> referencing Uri is very useful as well.
> 
> My only complaint is from a usage standpoint: I would really like a
> way to know the Uri is a feed or opml file from the HREF itself so I
> can parse an HTML document and retrieve all RSS/OPML files without
> doing a server request for each link.

There are ways for an HTML document to declare the content type of a 
link in advance of an HTTP request; the type attribute is used for 
RSS autodiscovery with link elements [1] and could just as well be 
used for a elements -- the type, rel, href and title attributes 
apply. 

<a rel="alternate" type="application/rss+xml" title="RSS" 
href="url/to/rss/feed">RSS feed</a>

This makes it a task for publishers to use such a scheme and 
browsers, spiders, etc. to do something with it.

URI is designed to be content independent -- content negotiation may 
result in any acceptable type being returned, or none. The HTTP 
Content-Type header tells you what's coming down the line.

I don't quite see Danny's use case where you have a feed and cannot 
deduce its network origin?

[1] 
http://diveintomark.org/archives/2002/06/02/important_change_to_the_li
nk_tag


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