OPML
OPML
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OPML

OPML (Outline Processor Markup Language) is an XML format for outlines (defined as "a tree, where each node contains a set of named attributes with string values"). Originally developed by UserLand Software as a native file format for the outliner application in its Radio UserLand product, it has since been adopted for other uses, the most common being to exchange lists of web feeds between web feed aggregators.

The OPML specification defines an outline as a hierarchical, ordered list of arbitrary elements. The specification is fairly open which makes it suitable for many types of list data.

Support for importing and exporting RSS feed lists in OPML format is available in Mozilla Thunderbird and in most other RSS reader web sites and applications.

The XML elements in an OPML document are:

Dave Winer, the founder and CEO of Userland, made a request for comments on a proposal for validating OPML. He released a beta version OPML validator in November 2005.

The Harvard Digital Library for Earth System Education (DLESE) published an XML Schema Document for validating OPML 2.0 in 2007. There is also a DTD available for OPML 1.0.

Alternative specifications have been proposed, notably these include OML, XOXO and XBEL.

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