Introduction The Outline Processor Markup Language (OPML format) is a widely used XML-based outline format designed to exchange structured lists of information. Originally developed for outlining documents, OPML has become the standard file format for managing RSS feeds, podcast subscriptions, and hierarchical data exchange. An OPML file (with the .opml extension) acts as a container […]
Read More… from Outline Processor Markup Language (OPML) format