Re: Feed updates and duplicates handling
Danny Ayers <[email protected]>
| Newsgroups | gmane.network.syndication.rss.devel |
|---|---|
| Message-ID | <[email protected]> |
On Wed, 22 Dec 2004 00:36:01 -0000, Frédéric Laruelle <laruellef-/[email protected]> wrote: > > > How are RSS feeds typically updated?, i.e.: > - are old elements removed? Usually there will be around 10-20 entries in a feed. When a new entry is published, it is added to the top of the 'list' and the oldest entry is removed from the bottom. > - how do you deal with publishing multiple times the same element(s)? Each entry has a globally unique identifier (its URI) so it's easy to spot duplicates (in the typical pub-sub situation). > is removing duplicates the responsibility of the reader? Hmm, yes and no. The publisher will usually only be publishing one copy of an entry in a feed at any given time. But if the reader gets the same entry from different sources (the original publisher, an online agregated site like one of the "Planets" etc) then they can use the entry URI to spot duplicates. (RSS 1.0 and Atom use standard URIs, RSS 2.0 uses 'guid's which can be arbitrary strings) > Are these topics addressed in a specification or earlier thread? Probably, but a long time ago - your best bet now might be Google. Here's one quick overview: http://www.mnot.net/rss/tutorial/ Cheers, Danny. -- http://dannyayers.com Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/rss-dev/ <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/