Outline Processor Markup Language Usage Statistics

Outline Processor Markup Language

the website provides a link to an OPML list. 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 web feeds between web feed aggregators.

https://en.wikipedia.org/wiki/OPML

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