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Posted by dave@userland.com, 11/7/00 at 3:52:49 PM.
OPML an XML-based format that allows exchange of outline-structured information between applications running on different operating systems and environments.
Basic stuff 
The spec is here.
In the summer of 2005 I released an open source OPML Editor, for Windows and Mac OS.
To learn more about outliners, the software category that inspired OPML, check out outliners.com.
The OPML spec has a liberal copyright, adapted from the copyright of the IETF, which has stood up well over time.
My OPML Validator came online in October 2005.
Implementations
11/25/2000: The first apps to support OPML are UserLand's Manila content management system, and the Radio UserLand outliner.
12/28/2000: Josh Allen has an XSLT processor for OPML.
9/16/2001: Scripting News is available in OPML.
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