2004-09-22
The myriad Sources of feed format "standardization" are standardizing on a way to <link> HTML pages to syndication feeds. How or where this is happening for RSS, I have no idea. Atom, however, is gathering around Mark Pilgrim's Autodiscovery IETF Draft:
<link rel="alternate"
href="/atom/feed/uri"
type="application/atom+xml"
title="Feed Title">
There's one major problem with this method, and that's the requirement
that rel="alternate" — or at least contain
alternate as one of the
link types
in its space-separated list.
alternate is defined to mean "this is a link to an alternate
representation of the same content". Examples are: a different file format
(e.g. plaintext or PDF), translations (e.g. French or Chinese), versions
suited to other media (e.g. optimized for printing or handhelds). Links to
to news feeds usually fit under the first category: they're an alternate
format of essentially the same content as the linking page. Examples of
this are the typical weblog's recent entries
page or news site's recent
headlines page or open
source project's suggested hacker starting bugs list. On these pages,
rel="alternate" is entirely appropriate and should be
encouraged.
Sometimes, however, a webmaster may decide to add feeds that aren't
alternate representations of the page. They may be feeds that form a
minor part of the page (like on mozilla.org
right now), or that represent content linked from the page but not present
in it. These feeds should not get rel="alternate"
because they don't represent the alternate semantic.
Specifying that a <link> represents a link to a newsfeed should
instead be done just by using an appropriate value (e.g.
application/atom+xml or application/rss+xml)
for the type attribute.
Note that specifying text/xml in the type
attribute is insufficient for this:
<link rel="alternate" href="xml-version" type="text/xml">
could just as validly be linking to a
DocBook edition of the page rather
than an RSS one. (Whether the server actually serves the file as
text/xml or under a more precise Content-Type header is a
separate matter.)
Say what you mean so that you mean what you say.
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