The APP spec suggests using ETag for this scenario. Take a look at examples 9.2.1 and 9.5.1 in the current draft.
There was some discussion about this on the Atom Protocol mailing list recently: http://www.imc.org/atom-protocol/mail-archive/msg08991.html, and Joe Gregorio wrote up a fairly thorough discussion on his blog: http://bitworking.org/news/150/REST-Tip-Deep-etags-give-you-more-benefits. Steven From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brian Smith Sent: Friday, July 13, 2007 7:47 PM To: 'Atom WG' Subject: How to implement the "Give me all the new & updated entries" use case Hello all, I have read through the Atom Syndication, Publishing Protocol, and Feed Paging & Archiving documents. I didn't find anything that allows the client to tell the server what entries it (the client) already has, so that the server can send just the new and/or updated entries. I feel like I must have overlooked something, because that seems like it would be the most frequent use case for APP. Is there a separate effort underway to standardize that? If so, where can I find information about it? Thanks, Brian
