Outline Processor Markup Language

Date: Sep. 22, 2000
Link: http://radiodiscuss.userland.com/opmlSpec
Source Author or Organization: Dave Winer, Userland Software, Inc.

Outline Processor Markup Language (OPML) is a format for storing outlines (such as those produced by any of several popular outliners for personal computers) in XML. Each outline is represented as a tree, where each node contains a set of named attributes with string values. The purpose of the format is to provide a way to exchange information between outliners and Internet services that can be browsed or controlled through an outliner.

OPML is also the format used by RadioUserland.com, Userland's MP3 site.