Re: Re: Feed, know thyself?

On Mon, 17 Jan 2005 16:11:25 -0000, Phil Shaw <phil-BtY/pAun/[email protected]> wrote:
> 
> 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.

Yep. The case with spidering/autodiscovery is slightly different than
the one referred to here.

> 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.

Quite. The resource identified by http://example.org/something.xml
could have both a OPML and an RSS representation.

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

When you click on a link in your browser...mime-type handlers in
Internet Explorer (and probably other browsers) only pass on the data
stream, not its source URI. (As yet I've not found a definitive doc
for this, but this is as I understand it from skimming around MSDN,
e.g.
http://msdn.microsoft.com/workshop/networking/pluggable/overview/overview.asp )

Cheers,
Danny.



-- 

http://dannyayers.com


 
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