OPML

I've added the standard, Outline Processor Markup Language (OPML), to the list at the left. (I've yet to move everything over to the right side. One of these days....) It is an XML standard for outliners.

The purpose of this format is to provide a way to exchange information between outliners and Internet services that can be browsed or controlled through an outliner.

The design goal is to have a transparently simple, self-documenting, extensible and human readable format that's capable of representing a wide variety of data that's easily browsed and edited. As the format evolves this goal will be preserved. It should be possible for a reasonably technical person to fully understand the format with a quick read of a single Web page.