Presentation Languages DEFINITION: Outline Processor Markup Language (OPML) is an XML file format used for creating outlines. As a result of the extensibility of the XML base, OPML has been used to organize many kinds of data as it may be customized for each application. The format is simple, self-documenting, extensible and human-readable. OPML allows a user to classify where content should be placed within a hierarchy as it is being
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