Henry Story wrote:
>
> You can have two entries or feeds with the same id, as long as they have
> different updated time stamps.
That's not quite accurate. Two entries with the same atom:id may appear
within the same atom:feed only if they have different atom:updated
elements. The spec is silent on whether or not two entries existing in
*separate documents* may have identical atom:id and atom:updated values.
Consider the case where my personal weblog publishes two Atom feeds.
One is a "full-content" feed that publishes content as XHTML. The
second is a "partial-content" feed that strips the markup and publishes
content as plain text in the atom:summary while containing an
atom:content with a src attribute to the original XHTML. They exist in
two separate Atom documents and both are based on the same underlying
blog post. The atom:id and atom:updated values for each entry are
identical.
Another example. I post an iCal file to an APP collection. In the
collection feed, I see a "media link entry" that uses content/@src to
point to the iCal. However, another feed that is used to provide a
summary of upcoming events has entries whose content element contains an
XHTML rendering of the iCal files. Each entry in the summary feed
corresponds to exactly one entry in the APP collection; should they or
should they not use the same atom:id and atom:updated values?
- James
> It's very much the same as you being Robert Yates all your life, but
> having different sizes throughout your life. At any point in time you
> have all the same properties...
>
> Henry
>
> On 7 Jun 2006, at 19:29, Robert Yates wrote:
>
>>
>> This relates to work that we are doing with the publishing protocol,
>> but is syntax related.
>>
>> In an implementation of APP a single entry can appear both in the APP
>> collection and in any number of arbitrary feeds that the site
>> subsequently offers.
>>
>> These feeds / collections can be optimized differently depending on
>> the client. For example, an entry in the collection feed may have its
>> content "out of lined" whereas the "same" entry rendered in a feed may
>> have its content inlined. There are other different optimizations
>> that we are investigating, that cause the entry representation in
>> various feeds / collections to be different, even though it has
>> originated from the same source.
>>
>> So are these representations in the different feeds / collections the
>> same entry or different entries? Should they have the same id? and if
>> a feedreader comes across two entries with the same atom id, what, if
>> anything, can it infer from that? is it only that they came from the
>> same source?
>>
>> Many Thanks,
>>
>> Rob
>
>
