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🧑kind protocolusage socialenc nonetopology federatedentity transportid none
- started
- 2000
- by
- Dave Winer, UserLand
- homepage
- http://opml.org
- wikipedia
- https://en.wikipedia.org/wiki/OPML
Outline Processor Markup Language — XML format for nested outlines. Practically used as the lingua franca for subscription lists between RSS readers.