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= OPML is essentially a way to exchange lists of RSS feeds between RSS aggregators.

URL = http://en.wikipedia.org/wiki/OPML


From the Wikipedia:

"OPML (Outline Processor Markup Language) is an XML format for outlines (defined as "a tree, where each node contains a set of named attributes with string values"[1]). Originally developed by Radio UserLand as a native file format for an outliner application, it has since been adopted for other uses, the most common being to exchange lists of web feeds between web feed aggregators.

The OPML specification defines an outline as a hierarchical, ordered list of arbitrary elements. The specification is fairly open which makes it suitable for many types of list data." (http://en.wikipedia.org/wiki/OPML)

More Information

Explanation at http://blogs.msdn.com/alexbarn/archive/2005/11/01/487592.aspx