Open OPML File
The OPML Format and Extension file is an outline document written in OPML, which stands for Outline Processor Markup Language.
About OPML
OPML is an XML schema format originally developed by UserLand as a native file format for the schema application in its Radio UserLand product, which is a software package, which includes a client-side blogging, an RSS aggregator, an outliner and to scripting language.
It has since been adopted for other uses, the most common being the exchange of web font lists between web font aggregators.
In this case, the OPML file is used to exchange RSS web feed lists between web feed aggregators.
The OPML is also used for other general schema purposes.
The structure of an OPML file is as follows, with the following XML elements:
- Version of OPML
- Header, containing metadata that describes the content
- Body, containing the content of the outline
- Outline, containing one outline line