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What is OPML?

I have heard the Acronym OPML, but I do not know what it means or how I should use it. What is OPML?

OPML has been getting a lot of attention lately but what is OPML? OPML or Outline Processor Markup Language is a file format standard that can be used to exchange subscription lists between programs.

OPML was initially designed by Radio UserLand as a file format for outlines. The purpose of this format is to provide a way to exchange information between outliners and Internet services. OPML has since been adopted for other uses, the most common being to exchange lists of RSS feeds between RSS aggregators.

OPML is an open format allowing other services to extend the format. While OPML was not initially designed as a vehicle to share RSS feeds, it has become the defacto standard. OPML, like RSS is based on RSS and because of the similarities those familiar with RSS have embraced OPML as a way to share RSS feed collections.

- RSS Knowledgebase Feed


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