(Outline Processor Markup Language) An XML-based format for describing outline-based content such as playlists and to-do lists.
"OPML." YourDictionary, n.d. Web. 21 June 2018. <http://www.yourdictionary.com/opml>.
OPML. (n.d.). Retrieved June 21st, 2018, from http://www.yourdictionary.com/opml
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