Three years ago, nodetypes were rolled out. They explain how the type attribute on an OPML outline element works, triggering a callback mechanism in the outliner, which allows it to route to the proper code to process an expand operation. That allows an outliner to be used to browse resources that aren't in memory, that can be located anywhere on the Internet. We got it working for RSS, and it was beautiful. It still works today. Maybe soon it will be time for this innovation to be used by users. [Scripting News]
