Changes to the OPML 2.0 spec
Tuesday, August 28, 2007 by Dave Winer.
Here's a list of the changes I made in the last couple of days to the draft OPML 2.0 spc. The changes were in response to comments here in July 2007. Included are notes on the specific suggestions, including ones I didn't understand or decided not to implement.
I provided in response to a request from Don Hopkins, a rigorous definition of flatdown. Actual C source code is provided. I also defined the other outline processing directions -- up, down, left, right, flatup and nodirection, even though Don didn't request those (and they're not mentioned in the spec).
I uploaded a copy of the C source code of the OPML Editor in a form that will be better indexed by search engines, so that future queries about the internal workings of outliners can be addressed by searching the source. It's licensed under the GPL, and build instructions using XCode are provided (as are build files for a variety of popular development environments).
Don Park wants to extend OPML using a wiki. Not sure I understand how this works, but he says it doesn't involve changing the spec (thanks!) so it's no problem for me. I'll watch and see how it develops.
PS: Possibly the coolest thing made possible by today's changes is the ability to embed OPML 2.0 data in RSS 2.0 feeds.