On 18/10/05 2:04 AM, "Antone Roundy" <[EMAIL PROTECTED]> wrote:
> Can "self" be polymorphic--the subscription URI in the live end of a
> feed, and "this chunk" in a historical chunk? Can an extension speak
> authoritatively about the meaning of something from the core spec?
If it were so, and you were looking at an historical chunk, you would still
need some link to where you might subscribe to that feed.
So, if polymorphic, you'd have in the current living chunk a link of 'self'
to subscribe to, but in a historical chunk you'd need to ignore the 'self'
link and follow the 'subscribe' link instead.
If not polymorphic, in the current living chunk you'd have a 'subscribe'
link, and in a historical chunk you'd have a 'subscribe' link. They would
both mean the same thing, and have the same value. In the historical chunk
the 'self' link would be different from the 'subscribe' link (pointing at
the historical chunk, of course), but in the current living chunk they could
very well have the same value ... or not...
The "or not" case is best exemplified by the nature.com feed links. If you
want to subscribe to Nature Medicine, you'd use this URI ...
http://www.nature.com/nm/current_issue/rss/
... but if you were to attempt to retrieve that URI today you would find
yourself redirected to ...
http://www.nature.com/nm/journal/v11/n10/rss.rdf
... where, if were atom, you might find a 'self' link pointing to that
second URI, not the first.
The nature.com feeds are, btw, a rather good real-life example of
non-incremental feeds.
e.
