Looks like I got sidetracked from my original mission to use this website as an xml playground to explore and develop new communications technologies, and instead wrote a social portal that hardly anybody cares about. That was a few years ago now. Well, I haven't given up. It just took a while to reach the state where I can get beyond the user-interface plumbing and get back to the machine interfaces which is where the fun is.
Feeds have improved a lot. I'm using Atom paging now. Still holding off on atom-thread for comments since I can do it so much easier embedding into the articles - though I note that the latest Firefox parses atom-thread just fine. No use forcing it on the public until a few more feedreaders have jumped on board. The code has been working for a year or two, but I'm just waiting for the rest of the world to catch up before I turn it back on.
I've been playing with a weblog export tool that's basically an Atom feed, but replaces images and attachments with inline data: URL's. Have had a few glitches - including a PHP bug in the regular expression library that I need to report. But this in theory can let you take an entire weblog and move it elsewhere as one gigantic XML file. Everything. Images, attachments, comments, categories, the whole nine yards.
I've also got Atom Publishing Protocol support in a very primitive state (but not yet ready for prime time). This is a big effort and I don't expect to be finished for a few months. I've got a suitable framework, but this site works a bit differently than the model used by the atom publishing spec. It will take a while to resolve all the differences so it plays nicely. This would for instance allow you to import your entire weblog from elsewhere in the world - especially one that used data: URLs to bring in images and attachments. Otherwise if I use the default model, I've got to package everything into a workspace for export, and this takes more than one file to represent all the structures completely. But that's the big picture - on a smaller scale, you should soon be able to publish weblog posts from your cell phone, or sync new articles with another weblog you may have. I 'm also not bothering with the xml-rpc remote mechanisms for publishing. They're primitive now, the api's too fragmented, and pretty much dead.
Oh yeah, and we've got trackbacks now - for any weblog that allows non-member comments. This is a flavor of xml-rpc. It isn't a big deal, but a few folks have requested it. You can find the trackback URL in the 'more actions' menu of articles - that is for any member weblogs that allow them. Mine does.
Oh, and photo albums can now be exported as zip files. That has nothing to do with XML...
prevented a large amount of mail going out for about 4 days, has had a
positive influence in Redmond. They did agree to work on their anti-relay
capabilities at their POPs to get the RBL lifted.
-- Bill Campbell on Smail3-users

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A general format for Atom that allowed cross-references in URLs (like cid:) would be useful both for images and other attachments and for related feeds like comments, trackback snippets, etc.Yeah, there are issues. I'm just trying to figure out how to get there from here. Right now data: URLs are the only way I can come up with to encapsulate everything. If a few people adopted it, it might be viable. At least everything to export an entire blog in a single file would be standards compliant. I'd be glad to see something better...
Hey congrats - I hear you're at Google now....