OPML (Outline Processor Markup Language) has been in Tendenci for some time now but is one of the little known pieces of functionality.
So – what is OPML?
OPML (Outline Processor Markup Language) is an XML format for outlines. 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 RSS feeds between RSS 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.
OPML is a list, much like the grocery list on your kitchen counter, or the to do list on your desk. In Tendenci, OPML is a list of RSS feeds.
For more on OPML and Tendenci: http://www.tendenci.com/en/help/#opml